AR Buffer question

[hpdrifter]

First off, I have to make a correction; evidently I ordered a H or H1; whatever it is weighs 3 oz. So, as some of the latter posts suggest it may be going too fast......may be. Ejects cases about 6-8 feet away.

Agreed, but most short guns are are over gassed and the BCG is moving too fast to lock back and based on my own experience it's more likely that it's moving too fast.

You can put your mobile on the side, in front of the ejection port and record the BCG (in Slow Motion Video setting) that'll give you a good image if the BCG is even reaching all the way back or not.... if it's NOT, then you're under gassed and it's not even going all the way back to lock....

It could also be your magazine, try different magazines, but I think it's a Problem with the speed of BCG going too fast and has to be slowed down (based on my short gun case) and I used a heavier Buffer...

heck, I'm going to stop here, because the more you think about it the more technical and over analyzed this can get...

For now, Just make sure you're NOT using an skeletonized BCG (light BCG), use a regular BCG and try a heavier and then a lighter Buffer to see what happens

can't use a regular bolt carrier, it's a side charger. it's not skeletonized either.

problem solved .. get the spacer!

what spacer?

yes, I missed that too...


Decide what you want and either change your tube or your spring to be in spec, or use the spacer as hesyomamma said. If your spring is too short, then your BCG may not be functioning correctly to lock

Good luck and let us know what happens.

why should I can tube and or spring, they're both carbine.
Gun runs fine, nary a problem except no locki backi

[Raider4044]

oly crap ... i re-read it again ... you have a rifle tube and a carbine spring .. buy the spacer !

they make a drop in spacer for just that .. if everything else checks out .. that's it!

Re-read it one more time. He’s got a rifle length gas tube, not buffer tube. [emoji6]


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[hpdrifter]

I ordered an H2 buffer' 4.6 oz.

If it needs more than that, I think I'll get an adjustable gas block.

[trophy8]

Sounds like it’s short stroking to me….

[hpdrifter]

Sounds like it’s short stroking to me….

that was my first thought and it might be, but seems like it might jam up once in a while if doing so.....just a thought.
I'm gonna give a heavier buffer a try, just to see if it is going too fast.
I think I already have one of the lightest in the tube now.

[imyomama]

ok then, just look at ejection pattern .. if it sends brass into orbit you're overgassed , if it just barely pops out , you're undergassed..

if you're undergassed , check port hole alignment to the gas block

if it's overgassed put a heavier buffer or an adjustable gas block..

[hpdrifter]

ok then, just look at ejection pattern .. if it sends brass into orbit you're overgassed , if it just barely pops out , you're undergassed..

if you're undergassed , check port hole alignment to the gas block

if it's overgassed put a heavier buffer or an adjustable gas block..

I checked the gas port alignment, it looked ok(concentric circles of port and gas pattern) and big enough.
The overgassed/undergassed pattern has me confused:
it sends brass from 4:30 to 6:00 which indicates undergassed and short stroking........but there is no ejection deflector on this gun and some of the brass is at almost 10 feet at 6:00. I've got a regular AR spring and a heavier buffer in route. I really don't like the regular springs...don't like the "boing" of them.
I'd rather get a mid-length lighter barrel than use a regular spring. Might do that down the road. Spent too much money already, have to wait a bit to make the change. Also (was)planning on a adjustable gas block.
With this 20" heavy barrel, this thing weighs about 10 lbs.

[imyomama]

well, everything else aside.. is the lower a home built ? have you tried other magazines ?

i know i have some lancers that don't always catch on the bolt catch tab ..

also you could have a burr on the lower or the bolt catch causing it not to move smoothly .. i usually flitz mine before i install them so they are butter smooth..

well you'll know soon enough when your parts arrive...

[hpdrifter]

Well, I finally got carried away and tore down the bolt/bolt carrier.
May have found the problem, well A problem if nothing else.
2 gas rings were lined up and the 3 was bent.
Straightened the bent one and placed them 120° apart.
I'm gonna try to shoot it today and hopefully that will help!
More parts to order.........unless the vendor steps up.

Anyone ever use the one piece gas ring?

[blaqkpanda]

I do have some experience with a one piece gas ring. It will always fail the gas ring test but should still work fine. You just won't have any indication of when it's starting to go bad. The only trouble it gave me was when I put a JP HP bolt in an Aero BCG running a 6.5 CM. It would fail cycle fully on the 5th shot in a string. I swapped it out for Sprinco gas rings and that solved my problem.

[hpdrifter]

I do have some experience with a one piece gas ring. It will always fail the gas ring test but should still work fine. You just won't have any indication of when it's starting to go bad. The only trouble it gave me was when I put a JP HP bolt in an Aero BCG running a 6.5 CM. It would fail cycle fully on the 5th shot in a string. I swapped it out for Sprinco gas rings and that solved my problem.

Thanks. save me an experiment and a few bucks.
Any speculation on failure of 5th shot? Heat maybe?

[hpdrifter]

Gas rings did the trick. I only shot 3 single rounds in 3 clips/magazines, but they all worked!
I'll test more, I just don't like popping a lot of caps on Sunday mornings, but the suspense was killing me.

[blaqkpanda]

Thanks. save me an experiment and a few bucks.
Any speculation on failure of 5th shot? Heat maybe?

Heat was my best guess along with the mixing of two different brand bolt/carriers. It must have been a tolerance issue combined with the heat.

[hpdrifter]

I found one thing not to do!
I got the H2 buffer in and although I'm pretty sure it was short stroking, I went ahead and tried it. I got a 3 round burst! Put the standard carbine buffer back in.

Now, after that, I'm getting light firing pin strikes. Tore bolt down and all looks good. Trigger group seems to be functioning good.

???????

[Raider4044]

AR Buffer question

I found one thing not to do!
I got the H2 buffer in and although I'm pretty sure it was short stroking, I went ahead and tried it. I got a 3 round burst! Put the standard carbine buffer back in.

Now, after that, I'm getting light firing pin strikes. Tore bolt down and all looks good. Trigger group seems to be functioning good.

???????

Sounds like a trigger issue.


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