The reason I started this thread is because my 16" midlength AR would not cycle with my A5 system with a A5 tube and A5-2 buffer. It would extract but cycle. It eject 4oclock now that it is on a carbine lower.
I do not run it suppressed.
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Member
The reason I started this thread is because my 16" midlength AR would not cycle with my A5 system with a A5 tube and A5-2 buffer. It would extract but cycle. It eject 4oclock now that it is on a carbine lower.
I do not run it suppressed.
Manufacturer
If it feels weak and won't run with the A5, there may be an issue.
Like Georgeib said, possibly a leak due to improper assembly or out of spec parts.
Swapping in a known good BCG can help isolate the source.
Was this a build or a complete upper?
Originally Posted by Wow
Black River Tactical
BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
BRT Bolt Carrier Groups M4A1, M16 CHROME
BRT Covert Comps 5.56, 6X, 7.62
Member
I paid a gunsmith to assemble it for me.
-VLTOR MUR upper
-Criterion made American Defense MFG Hybrid profile Chrome Lined 16" midlength barrel
-SF Flash hider
-Sharps DLC BCG and PK Firearms Microbest Chrome BCG
-Radian CH
-Griffin Armament non adjustable gas block
-Aero Melonite black gas tube
Should my gun cycle with mid length gas and a A5 H2 buffer? I've heard that if it was carbine it should but no mid length because mid length is not overgassed?
Last edited by Wow; 08-01-21 at 13:30.
Site Sponsor
Nothing to do with mid vs carbine. With an appropriately sized gas port a 16” mid should run all day. I don’t think I’ve seen a 16” mid (or extended mid) in good condition that wouldn’t run with proper ammo and pretty much any buffer. Maybe I missed it, but: What ammo are you using? What spring?
Member
Ammo: 5.56 Federal milsurp 55gr
Spring: standard carbine buffer spring and buffer.
Last edited by Wow; 08-01-21 at 14:38.
Site Sponsor
XM193 should have enough juice to cycle any reasonable 16” gun.
With the A5-2 system that it does not cycle, you’re using a regular rifle spring, correct? Do you have another BCG to try? Could be leaking a bit around the gas key or something else off about the carrier.
Member
I've tried two reputable BCGs. One sharps and one microbest. Made no difference. I can try a different microbest too but I doubt it will make a difference.
When I was using the A5 system it was the intermediate buffer tube with a green sprinco rifle spring. A5-H2 buffer.
Last edited by Wow; 08-01-21 at 15:19.
Site Sponsor
Interesting. Perhaps its leaking around the gas block, or the little nipple on the tube is undersized or something? I wouldn’t be at all concerned about the 4 o’clock ejection angle, but I do find it a little concerning that it won’t run the A5. Might seal itself up a bit with some more use, but I’d be looking for a gas leak, assuming everything is moving freely by hand with no binding.
Member
It bothers me because I thought I bought all high quality parts so I was expecting it to work flawlessly out of the box. How the heck are manufacturers still messing up ar15 parts. Maybe my gun smith is bad too, who knows.
Last edited by Wow; 08-01-21 at 16:06.
Senior Member
It may not be the parts. It may be the man that assembled it for you. Maybe he installed the gas block slightly off.
Last edited by Inkslinger; 08-01-21 at 16:34.
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