Jump to content
sgtrujillo

Issues with my AR Pistol build

Recommended Posts

Ive tried a couple of different things with my AR pistol build and Im still having cycling issues. It ejects the spent casing but the new round gets caught on the BCG. I have to drop the mag and pull the charging handle back to clear the round. Any thoughts.

Share this post


Link to post
Share on other sites

Can you give us the specs on your pistol? Barrel length, gas system, caliber, make? We can assist better knowing more.

 

Welcome to the Armory.!

Share this post


Link to post
Share on other sites

5.56, 7.5 barrell with flash forward can, KAK pistol buffer tube with H2 buffer, standard carbine spring, .750 low pro gas block. No particular brand. Its my third build but my first pistol.

Share this post


Link to post
Share on other sites

I don't have any experience with pistols but the usual checks should apply......have you tried different magazines, gas port aligned correctly, Swapped BCG with another, used different ammo.?

Share this post


Link to post
Share on other sites

So far I’ve swapped out magazines, and buffer. I was initially running a standard carbine buffer but was told that might be an issue. I haven’t checked the gas block alignment yet or used different ammo. I’m currently using 55 gr American Eagle.

 

 

Sent from my iPhone using Tapatalk

Share this post


Link to post
Share on other sites

So far I’ve swapped out magazines, and buffer. I was initially running a standard carbine buffer but was told that might be an issue. I haven’t checked the gas block alignment yet or used different ammo. I’m currently using 55 gr American Eagle.

 

 

Sent from my iPhone using Tapatalk

When you were running the carbine buffer was this problem happening or did someone just tell you that it could become a problem?

 

Welcome to the forum.

Edited by bamashooter

Share this post


Link to post
Share on other sites

It happened on the initial testing. I had Pmags, standard GI mags and Hexmags that I tried and that didn’t make much difference. That’s when I read/heard about AR Pistols needing a heavy buffer.

 

 

Sent from my iPhone using Tapatalk

Share this post


Link to post
Share on other sites

With the heavier buffer does the bolt lock back after last round?

Share this post


Link to post
Share on other sites

No Sir it does not. However, before I replaced the buffer, it wasn’t locking back on the last round either.

 

 

Sent from my iPhone using Tapatalk

Share this post


Link to post
Share on other sites

I would check a couple things. Gas block alignment screws are tight and tube is clear of debris.

 

Swap the H2 for a H1 or H0. So the last round bolt hold open works.

 

Check gas rings. Insert bolt into carrier hold tail end turn upside down if it falls out replace the rings.

 

Try a different bolt it could be the extractor springs in the bolt.

 

Try a different BCG.

 

I put together an 11.5 BA 556 with a Geissele super gas block and installed Vltor A5 H2 Pistol buffer kit. I have had no issues whatsoever with this set up. I also use a Toolecraft C158 BCG

Edited by RedDawn

Share this post


Link to post
Share on other sites

What ammunition are you using? Perhaps it doesn't have enough "umph".

 

Do you know how to check the gas key (and screws), rings, gas tube, gas block for leaks?

 

Does the bcg move easily doing it manually with and with out the charging handle?

 

In a safe area, can you easily and satisfactorily chamber and eject a magazine's worth of rounds fairly quickly?

Share this post


Link to post
Share on other sites

Ok I can check all of that. I have a spare BCG as well as two additional ones on other ARs. I’m running 55gr American Eagle FMJ. I didn’t suspect it was a gas problem because only about every third or fourth round is a failure to feed. I’ll check all of that though.

 

 

Sent from my iPhone using Tapatalk

  • Like 1

Share this post


Link to post
Share on other sites

But if it doesn't lock the bolt back with even a light-weight buffer, we have a definable issue. Just gotta define it. :)

Share this post


Link to post
Share on other sites

You really need to check the gas block alignment. Additionally, if you are not using 5.56 NATO spec ammo, you may be experiencing short stroking. An improperly aligned gas block as well as low pressure ammo can cause this effect.

  • Like 1

Share this post


Link to post
Share on other sites

Copy that! I’ll get to checking all of that and then purchase some 5.56 ammo and head back to the range.

 

 

Sent from my iPhone using Tapatalk

  • Like 1

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.