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Member
Hello,
I built a DD 10.3 with A5 system. I bought a sprinco green and my setup does not cycle with any buffer. I tried everything from A5H0 to and H3 and nothing. It’s 556 loads. I am going to get a regular rifle spring but this is a frustrating moment for me. At DD they did explain that they use a regular carbine spring with a carbine H1 buffer.
This was after the fact that I had built what I explained above... this is the first time I have an issue with the A5. I need some help.
Last edited by elpotro; 07-10-20 at 20:28. Reason: Typo
Senior Member
Sounds like something isn’t right.
Try a carbine spring to see what happens.
A MK18 should run fine on a carbine spring and H thru H3 buffer.
Senior Member
Is there any gas block misalignment?
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I’m not supposed to put a carbine spring on an A5 buffer tube correct?Originally Posted by 17K
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Correct, CAR spring and buffer requires the 3/4" shorter CAR tube.
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Member
I will check that right now. It would be the first time ever that I misaligned a gas block but there is always a first time. I do have a Ballistic Advantage gas block on a Daniel Defense barrel. That is the first time I ever did this. I built this with spare parts except the Barrel that I did buy. The BCG is a BCM.
Senior Member
Try a different bolt if you have one, built up a 11.5 once with all new parts that didn't want to run and swapped a BCG from another upper with a couple of hundred rounds on it and both have been 100% since then, go figure.
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Senior Member
It's clearly NOT an A5 buffer issue. Does it seem OVER or UNDER powered?
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
Senior Member
My MK18 works great with the A5 system, both green spring and standard rifle spring and A5H2 and I believe A5H3 buffers. There's definitely something else going on.
Sic semper tyrannis.
Senior Member
Something else is going on besides your Buffer/Spring setup. Gas related, I bet. What BCG, gas block, and gas tube did you use?
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