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Issues with my AR Pistol build


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#1 OFFLINE   sgtrujillo

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Posted Jun. 26 2018 - 01:39 PM

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.


#2 OFFLINE   towtruck

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Posted Jun. 26 2018 - 01:42 PM

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

 

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#3 OFFLINE   sgtrujillo

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Posted Jun. 26 2018 - 01:48 PM

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.


#4 OFFLINE   towtruck

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Posted Jun. 26 2018 - 02:13 PM

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.?




#5 OFFLINE   sgtrujillo

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Posted Jun. 26 2018 - 02:19 PM

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.


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#6 OFFLINE   bamashooter

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Posted Jun. 26 2018 - 02:21 PM

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.


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

 

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Edited by bamashooter, Jun. 26 2018 - 02:21 PM.



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#7 OFFLINE   sgtrujillo

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Posted Jun. 26 2018 - 02:26 PM

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.


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#8 OFFLINE   bamashooter

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Posted Jun. 26 2018 - 03:25 PM

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




#9 OFFLINE   sgtrujillo

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Posted Jun. 26 2018 - 03:44 PM

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


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#10 ONLINE   RedDawn

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Posted Jun. 26 2018 - 04:33 PM

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, Jun. 26 2018 - 04:33 PM.



#11 OFFLINE   bamashooter

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Posted Jun. 26 2018 - 04:59 PM

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?




#12 OFFLINE   sgtrujillo

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Posted Jun. 26 2018 - 05:08 PM

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.


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#13 OFFLINE   bamashooter

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Posted Jun. 26 2018 - 06:54 PM

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




#14 ONLINE   TackleberryMCS

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Posted Jun. 26 2018 - 06:58 PM

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.
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#15 OFFLINE   sgtrujillo

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Posted Jun. 26 2018 - 07:01 PM

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


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#16 OFFLINE   sgtrujillo

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Posted Jun. 27 2018 - 02:55 PM

So are you saying that on a 7.5” pistol platform that I don’t need a heavier buffer?


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#17 OFFLINE   bamashooter

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Posted Jun. 27 2018 - 04:05 PM

So are you saying that on a 7.5” pistol platform that I don’t need a heavier buffer?


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Who knows. You hear this, you hear that. I have an 8.5" pistol (pistol-length gas) which came with a carbine buffer. "Won't work!" blah, blah, blah. Long story short. It worked fine, as did an H, as did an H2 and H3. Very, very, little noticeable difference other than about a 2 ft difference in where the brass landed. I believe I left the H2 in it. I shall check. Hold one. The H3.

 

With my 1911s I go with the lightest recoil spring that provides perfect function. Not really all that knowledgeable of ARs. Got he bolt cycling rearward against the buffer, spring, tube and forward to the barrel extension. In my perfect little world I'd like to minimize the impact to the extension. I reckon softer cycling is better all things being equal (reliability).




#18 OFFLINE   sgtrujillo

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Posted Jun. 27 2018 - 04:51 PM

Fair enough. I appreciate the feedback.


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#19 ONLINE   TackleberryMCS

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Posted Jun. 27 2018 - 05:19 PM

So are you saying that on a 7.5” pistol platform that I don’t need a heavier buffer?


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It pretty much depends on how it is gassed. The gas port opening and barrel length have a lot to do with it. Usually, shorter barrels (7.5"-11.5") can benefit from a H2 buffer. It does help to mitigate some of the recoil. As far as the issue you are having, it may have no effect at all at fixing it.


#20 OFFLINE   Srgt. Hulka

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Posted Jun. 27 2018 - 07:02 PM


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