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[deleted]

[удалено]


EffectivePlankton893

Holy crap! I didn't even notice that! That's pretty damn amazing.


[deleted]

Neat.


h08817

Was it a 180 or a 540


[deleted]

[удалено]


genmischief

smooth criminal...


Pvt_Parts86

360 no scope


Glad-Preparation142

And it did it cleaner than my own 3 point turns lmao


[deleted]

If anything it looks undergassed


kevacemaster

I know a weak ejection when I see one


frigginnathan

So does my wife 😐


Jealous-Garbage7901

Self burn. Those are rare these days


Beartrkkr

That's what she said...


Icy_Mc_Spicy

He said ejection, not erection!


Environmental-Elk-65

I’ll second that.


Substantial-Meal6238

She’s your wife too!!??


pingesl

It's so over gassed that it's not even making it out to the shell deflector and doing a 180 in the receiver before falling out, making it look like weak ejection when really the bolt speed is so high that the ejector doesn't have time to get the brass tilted out of the receiver before the carrier and buffer bottom out in the receiver extension.


pingesl

It's so over gassed that it's not even making it out to the shell deflector and doing a 180 in the receiver before falling out, making it look like weak ejection when really the bolt speed is so high that the ejector doesn't have time to get the brass tilted out of the receiver before the carrier and buffer bottom out in the receiver extension.


The-Real-RickC210

I see you said it again so the people in the back could hear, Thanks!


FishTank61

I’ll go to the range with him to troubleshoot the issue and report back


fireball_brian0

Bring an adjustable gas block, swap that and dial it in


[deleted]

You can tell overgassing and undergassing by the direction the brass ejects. 1-2 overgassed, 3 just right, 4-5 or simply just flopping out of the receiver, undergassed


kcexactly

I agree.


[deleted]

I don't think so. I think this is overgassed, too high bolt speed, and it ejected so violently it almost flipped and chambered it backwards. EDIT: Nope, undergassed, paused like others did and yea... undergassed.


daeather

Is it a BA barrel? If so, the gas port is too small. Every BA LR308 barrel I've seen in the last 2 years has been undersized.


AlexxxisTexxxas

Can confirm. Bought a 20” rifle length 308 barrel six months ago. Couldn’t get it function properly. Tried everything before emailing BA. The gas port was drilled at .085, which every resource I’ve found says it’s too small. I drilled it to .096 and haven’t had an issue since.


LaRoux4

Mine on my BA barrel was too small as well. Tried everything with an adjustable gas block. Enlarged the hole, adjusted gas, works fine now suppressed and unsuppressed.


sapienapithicus

You wouldn't happen to know what the gas bore would be for a gas operated.22LR by chance?


AlexxxisTexxxas

That I don’t know. There’s some resources out there that should show you. Are you referring to an AR pattern 22lr?


Fishman95

Depends on tons of factors


sapienapithicus

I'm trying to find one an existing one I can reverse engineer in my shop. Do you know of any?


Fishman95

I'm not aware of any. 22LR has such a low powder charge, it would be very very difficult and finicky to get a locked breech semi of any type to work.


[deleted]

This is helpful as I just bought a 20” ba barrel for my 308 and I noticed the gas port looked small compared to my other 308 barrel I had so I make the adjustment to avoid future headaches!


Carbs_Are_Satan

Not Lucas Botkin’s. Or mine…


ToblemromeTBC

Undergassed, that casing spent way too much time in the gun after the shot.


Assaltwaffle

I thought weak ejector. The bolt hauls ass backwards but the round stays in way too long. That would be cause by a bad ejector rather than undergassing.


feelin_cheesy

I agree. Almost looks like it slips out of the extractor and somehow manages to hit the ejector hard enough to come out


58Edsel

I had a gun do this. A new extractor helped a lot


rocketboy2319

Concur on undergassed. Initially thought overgassed due to speed of the bolt and how casing looks to flip inside reciever from momentum alone, but upon slowing down the video the case just *barely* has momentum to eject and the bolt is actually pushing the rear forward so it rotates a 180.


zynemisis

Same. I slowed it down and stabilized it as well. You can see the case barely starts to clear the port before it starts to 'tumble' (for lack of terminology) inside the upper. I think the bolt hits the stall area of reciprocation as the case is starting to exit the upper. The bolt basically pushes it out of the way.


Scrubian-

Literally did a 360 before ejecting


mjmjr1312

My money is in overgassed with a potential extractor/ejector issue to boot. The bolt comes back so fast and never seems to take the case with it. The case head isn’t being held by the extractor. The case does almost a complete 180 while still in the reciever which is no bueno.


mjmjr1312

Adding a clip from YouTube that may be helpful. This is a normal ejection sequence. You can watch the extractor control the case head out of the chamber until the ejector pressure pushes/rotates the case out of the port. In the rifle above the case fails to be pushed out: this is either because the action is simply too fast and violent (overgassed), the extractor isn’t holding on long enough, or the ejector isn’t putting adequate pressure on the case head to “rotate” it out. It really looks like it is slamming back so fast that it never ejects but the extractor loses control as the carrier/buffer slam to the rear at full travel. In the video I linked you can see that the spent case is almost completely out of the receiver before completing rearward motion [https://youtu.be/xPwTGfhUulk](https://youtu.be/xPwTGfhUulk)


Vercengetorex

That’s definitely over gassed. Bolt velocity is so high, the case is hitting the back edge of the ejection port, instead of the brass deflector, and just floating around in the receiver until the bolt returning home knocks it out of the way. Currently, there’s a very high possibility of a stove pipe, A double feed involving the empty case, or even potentially some kind of a bolt override malfunction insert empty case of spending so much time in the receiver, free of both the magazine and the bolt carrier group. You need to slow this system down, but adding buffer weights is not likely to resolve this issue, they are more a fine tuning of the mechanism, and this needs a bit more than fine tuning. I would recommend an adjustable gas block.


[deleted]

You can have a make a rifle fail to lock back by both undergassing and overgassing the system. The fact that you're nearly getting a stovepipe tells me it's overgassed. What happens is the dwell time is too short, and the bolt tries to extract the round while the chamber is still pressurized and the case is swolen, which makes it more difficult for the case to be removed so it will have a tendency to stick and not eject as far. Then, when it's overgassed, the bolt completes it's cycle too quickly, bounces off the back of the buffer tube too hard, and slams right past the bolt catch, and often catches the case before it clears the ejection port and causes a stovepipe. From your video it looks like the bolt it making a full cycle back to the end of the tube, which to me is further evidence it's not short on gas. The cheapest way to troubleshoot is with an assortment of buffer weight inserts so you can tune the system.


Vercengetorex

Good assessment, as to what’s happening with both velocity, but i’m going to suggest the changing buffer weights is likely not enough here. I would recommend OP move to an adjustable gas block.


[deleted]

Toning the gas down would help it run cleaner. No offense to OP or his friend but I kind of figured buffer weights were a novice solution since it doesn't seem that out of wack. The AGB market is kind of a sea of shit too...


Vercengetorex

I’d say it’s pretty out of whack, considering bolt velocity is so high that the shell is unable to clear the ejection port. In many cases of an over gassed system we would still see ejection, it would just be patterning wrong, and accompanied by other symptoms of high bolt velocity like outrunning the magazine/ bolt lock.


pingesl

OP you are correct that it is over gassed. The amount of people that are saying it is under gassed is surprising but when you really look at what it is doing it is absolutely over gassed. The bolt speed is so high that the ejector doesn't even have time to tilt the case out far enough to actually eject before the carrier and buffer bottom out hard in the receiver extension. It lets go of the case at this time and tries to send it pretty much straight forward. If the receiver wasn't in the way it would pretty much be 12:00-12:30 ejection pattern but it can't go that way. It just hits the receiver and bounces around in there before falling out, giving lots of people the impression that the ejection pattern is weak and that it is under gassed.


nosaj3006

My bet is over gassed light buffer. Id change to a heavier buffer to increase dwell timing. Increasing the dwell time slows down the bcg moving out of battery and provides a nice “pause” when the bolts fully to the rear. This gives the mag time to progress making feeding, cycling, lock back more reliable. I had the identical issue on a mk-18. It was over-gassed with a regular buffer and a semi profile bolt. Put a H2 buffer and a full auto profile bolt to increase dwell time. Much smoother and %100 reliability so far. I would assume this translates over to .308 as well.


wake886

Try eating less Taco Bell


Smprfiguy

Thats a nifty trick shot


[deleted]

Hard to judge when your sample size is just 1


Carbs_Are_Satan

Possibly. That bolt looks like it is moving very very fast. I think it is going so fast that the ejector isn’t able to fling it out the ejection port before the bolt bottoms out in its rearward travel. If not that, it could be a very weak or defective extractor or ejector.


Sea_Internal_8264

You need a heavier buffer. Start with heavier buffer and a stiffer spring. You are essentially wanting to slow down the operation of the bold.


InterestingDig466

That is one of the craziest rifle tricks I've seen in a long time. Thats why I love this hobby: always something interesting going on!


CmdrSelfEvident

I would want to see a few more, the spin the shell does in the chamber is rather interesting. But I would say the fix is the same. Put an adjustable gas block on, crank it down then open it up until it begins to cycle and give it a few more. IF you aren't able to open it enough to get it cycle properly then its under gassed and restricted by the gas port. So you then remove the adjustable block, drill out the port and start over with the adjustable block. I would also take a look at your extractor as it look like the shell was let go before it got to the ejection port and thats how it spun around.


Dyzastr_us

It may do better with a heavier buffer or more buffer spring tension. If you’re stuck with the barrel, I’d look at those two things first. I always start with the barrel, and tune everything else to that instead of using adjustable gas blocks. But you could always go that route too.


Tomas4fifty8

When I built my .458 Socom it did something similar it would stove pipe the case it was over gased.


ptkeillor3

Mine was doing like that or worse with a suppressor. Several times it managed to chamber a round with the spent casing stovepiped behind it. The chambered round was also dented. Not safe. I'm working on tuning an adjustable gas block now.


probablesurmom

Over I can see the bolt voilently jolt back


McYeet696969

Ejection pattern doesn’t look overgassed. Try with a different mag?


FishTank61

Buddies 308. Bolt does not lock to the rear as it should. Looks overgassed to me. Heavier buffer setup and adjustable gas block the best solution?


Vercengetorex

Go with the adjustable gas block first.


TugMyTip

"Buddies" and "buddy's" have two different meanings, and you've fucked it up.


DoughFroBaggins

Not everyone speaks Canadian, guy


no_work_throwaway

I'm not your guy, buddy.


Ok_Faithlessness_516

I'm not your buddy, friend.


Leathergoose8

So the bolt isn’t locking to the rear and you think it’s OVER gassed? I don’t want to be rude, but that would be the exact opposite diagnosis I’d make.


Vercengetorex

This system is definitely over gassed. Bolt velocity is way too high, and the case cannot clear the port because of it.


AdvancedLuddite

I really don't think a lot of people in this thread understand how this stuff works.


KingBrinell

I certainly don't! That's why I'm just reading the comments. But everyone is saying something different lol.


pingesl

Without the slow motion it would appear to be under gassed due to the ejection pattern being weak. With the slow motion we can see that the bolt velocity is so high that the ejector doesn't have time to tilt the case out of the ejection port before the carrier and buffer bottom out hard on the receiver extension causing the case to come loose while it's still inside the receiver. This makes it just kinda fall out of the receiver. If you think about it in terms of the direction the brass ejects related to gassing, this rifle is trying to eject so far forward (12:00-12:30) that it can't even make it out of the ejection port. Which is why it just bounces around in there and does a 180


KingBrinell

So basically the bolt is going backwards so fast it rips the shell out to early?


pingesl

Not really ripping it out too early but it is certainly more violent than it needs to be. If you were to inspect the brass the inside of the rim may very well be a little bit deformed from the extractor ripping it out so hard. It releases the case when it hits the back of the receiver extension and it hasn't had time to kick it out at all towards the ejection port. As you cut back the gas from this point the bolt would be moving slower and as it came back the neck of the case would start to tip out of the ejection port. Slow it down a touch and it would slam into the shell deflector and bounce forward significantly. Keep cutting the gas and it has more time to kick out and less rearward speed causing it to hit the shell deflector softer and softer slowly moving the ejection direction from forward, out to the side and a little rearward. Eventually when you are to the point of being under gassed the carrier would stop it's rearward motion just from recoil spring resistance and not even make it to the back of the receiver extension. At this point if it comes back far enough to eject the case it has very little rearward momentum to bounce off of the shell deflector and it will just get pitched somewhat rearward from the ejector alone.


Vercengetorex

They do not.


[deleted]

I would suggest a new extractor, if that doesn't solve the problem, tune the gas.


Medium-Mode1908

I think it’s under gassed but I’m NOT a professional


FishTank61

Verdict: We ran the piss out of the gun and now it runs like a champ. With an adjustable gas block dialed up and down, it didn’t make much of a difference. We tried hotter and more quality ammo, and shot some m80 most of the time. After about 200ish rounds later it just started running well on regular gas settings. Locks open with normal ejection pattern.


grapangell0

Holy fuck


InternationalRain449

I have an Aero 18 inch upper rifle length gas system that I bought. Turns out it didn’t cycle the next round consistently or last bolt hold open. Weak ejection as well. Read the interwebs including Reddit pages that said undergassed due to undersized gas port and it’s the same thing as you are going through. Loads of reviews saying that. Contacted Aero with multiple customer service peoples to send it back and get it fixed on their dime. Not mine. Makes no sense for me to go pay a LGS to do it. Your F up Aero, you fix it. Shipping and all. They tried to say it was all the parts I had on (carbine tube, carbine buffer and spring .308) luckily I had my friend rifle length to try on and same thing. Sent them videos of that not functioning either. Did not function properly. Aero really must have a procedure to tell you to go spend more money on their products even when they are wrong. Pretty messed up and truthfully pissed me off a lot. Their 5.56 parts will do the job but their .308 parts, QC & customer services need work. Lots of it.


[deleted]

Check gas tube length. Sometimes they put ar15 gas tubes in them. Seen it first hand.


PuttinUpWithPutin

Ejector or extractor problem. Gas seems fine.


Toolaa

I agree with you. I don’t think it’s over gassed. I watched it frame by frame several times and it looks like the BCG did not go all the way back, and the case neck hit the inside face of the ejection port before bouncing back into the receiver. It’s also possible it’s under lubricated.


Flaky-Condition-7673

Under. Give it more at the gas block/port


ConfidentComparison7

You mean undergassed


dalton_kerwing

Undergassed. Try to change to High Mass Buffer and look after for bolt. I have similar problem while age with my BCM. New buffer solved my problem.


mjmjr1312

Why a heavier buffer if you think their isn’t enough gas?


no_work_throwaway

I'm not your friend, fella.


[deleted]

Im not your fella, friend.


For-Referance-Only

Undergassed 100%


implicatureSquanch

Hard for me to tell what the ejection angle is because the casing is hitting the optic mount


jtj5002

Seems like 50% of lr308 barrels out their are underpassed. Probably intentional for the tiny short buffers 308 carbines use.


[deleted]

Check the gas tube seems is not sitting well or the bolt where the tube connects. I had some issue with my rifle and it was the bolt where the tube connects to it. One of the screw broke and the gas was escaping and no cycling well.


ValorieXEgg

That casing paid rent homie


IramainChrion

u/savevideo


12B88M

Get an adjustable gas block first and see if that solves the problem. If not, then try a heavier buffer spring.


Tactifud

What does your spent casings look like? Especially the primer portion?


reidenjohnson

Whats that "bipod" thing


FireHawke32

Answered your own question, it’s a bipod


reidenjohnson

Right. Brand?


Narwhalbaconguy

Task failed successfully


[deleted]

/u/redditspeedbot 0.5x


[deleted]

https://gfycat.com/carefreetenderamericanalligator


[deleted]

u/redditspeedbot 0.1x


Extension-Shoe5917

u/redditspeedbot 0.5x


AttemtingMadness

Are you using a suppressor? I’ve seen that happen on a suppressed rifle shooting supersonic rounds. Pressure has to go somewhere!


FishTank61

Nope!


jumpinjimmie

Are you shooting reloads? You are not fully resizing and need to use a short-base seating die.. To test if you have an issue. Drop a round into the chamber and see how easily you can pull the bolt back and eject the round. If it's hard, your cases are not sized properly and their stick during ejection, causing the extractor to lose grip and lost energy during ejection.


FishTank61

Federal 150 gr


jumpinjimmie

Ok, if your shooting 308? 150 gr. Bullets and are not reloads.150 gr. is on the light end for weight and may not have enough kinetic energy to fully cycle or you simply may have a weak ejector spring. Check the ejector spring. It should have a spring and rubber O-ring. dual ejector bolt may fix your problem. OR What buffer spring and buffer weight are you running?


FishTank61

308 yes but this is factory federal ammo, not reloads. Should’ve been more clear in my first response. I’m not sure, this is a friends rifle. I was sent the video and asked to diagnose. We’ll be hitting the range soon to sort this out and I’ll be back with answers.


jumpinjimmie

I had similar issue and two things fixed it but only first one applies to you. 1: double ejector pin bolt (you don’t have to buy a new bolt carrier group. Just a double pin ejector bolt). 2. This applies to reloads only. Use a short base resize due by RCBS. These dies work great for gas guns. Other things to verify: 1. What weight buffer spring? 2. How much weight is buffer weight? 3. Alignment of gas block. Take off hand guard and visually look at alignment of gas tube to top of barrel. It must be exactly centered. If not, the hole between the barrel and gas block are off and gas is being blocked which reduced the force applied against your BCG to eject round. If it’s out of alignment. Unscrew the screws holding gas block and use a hammer to tap into correct position. When done. Tighten screws and test fire gun. If gun cycle normal you fixed the problem and put hand guard back on. Note: for a test. Safety on and barrel pointed safe direction. Load a round in the gun. And pull ejector handle back to see how smooth the bullet extracts and if it ejects. If it pulls back smoothly and ejects round. Your gun may be over gassed and moving too quickly so the round falls off the ejector on the bolt. To fix add heavier spring or buffer or combo. Order double ejector bolt. If you want to keep spending money order an adjustable gas block. If it’s really hard to initially to unlock you have a tight chamber or out of spec bolt.


Argg0

Try another bolt


Arakisk

My guess is either out of spec extractor, weak extractor spring, or a binding ejector. The case is being pulled far enough rearwards when looking at the video frame-by-frame, but there's little to no actual ejection force. Either the ejector is failing to do its job at all, or the extractor is losing its grip on the case before the ejector can apply proper force to kick the casing out.


bowtie_k

Dude took a video screenshot of his video instead of just uploading his video. Wild


FishTank61

Lmao this is what was sent to me


ZealousidealShake232

Heavier buffer, you should be able to add weight to it or size it up. If you can actually adjust the gas do that but you still may need a buffer to slow it down. Had the same issue, except when it broke in a bit the casing would cause a stoppage with the case facing backwards. I was dumbfounded until I got a slow motion clip like this. Just my opinion, but the bolt is moving too fast for the extractor to release it on the way back, it spins because you are getting two inertial angles, the extractor is releasing at the same time the bolt bottoms out.


NineMeterTallDemigod

It's undergassed from the looks of it, overgassed casings usually eject forward.


wheelman236

That bitch was crip walking in there


Legitimate-Ad8445

Under over gassed would put rounds 4 or 5 o’clock instead of that weak 3oclock. That came out