Tuesday, March 24, 2026

Followup to the rifle post Added to

It has a H3 heavy buffer.
Has a standard +25% buffer spring.
The gas block is a Superlative Arms adjustable.  When you adjust it to lower pressure, it vents the excess out a port in the front of the block.  It's been adjusted to release to the limit it will go before, though next time I shoot this I'm going to take it all the way down and try it again,  Because why not?
Same with various magazines.

I've talked to two good gunsmiths, one looked the rifle over thoroughly and said he didn't know, the other, after various talks, suggested it's cursed.  Yes, I do know they're good.  This one has them baffled.

I've done more reading the past couple of months on this type rifle, and various things people have tried on theirs...

I'm going to think about all this some more before I mess with it again, and go from there.  And I do appreciate all the ideas.  And I'll try to contact that one guy mentioned.


Added:
Magpul and steel magazines, bought different times and places.
Happens with factory and handloads.
And, copied from my comments,
I don't want to go to a heavier buffer, because I found out what that would cost.

Changing barrel because of port size, same.

The Superlative gas block has a total of 48 clicks of adjustment: from closed, open 18 gives you a fully open port, max pressure. With it open an additional 8 clicks it functions perfectly without the can. I've tried it with up to 46 clicks of bleed-off mode with the suppressor. I think I'm going to open it to max, and try it again now that it's all been fired and settled in a bit.

And I'll keep reading.

7 comments:

Anonymous said...

Also, Do not forget the role of ammo in this equation. .308 has a wide variation in powder so what works fine with one load may not with another. But I think you are on the right path investigating the pressure,

-Generic

Anonymous said...

Not a gunsmith, just curious about your situation. Did you get all your mags from the same source?

Sambo said...

Kind of sounds like the rifle is way over gassed. The gas port may be way oversized.

Anonymous said...

Please describe the malfunction.

Justin_O_Guy said...

You'll know you've studied the Varible gas block when you've Slowly dialed it down till it doesn't cycle. I'm not a gunsmith, built two ARs, and with my almost nonexistent experience I clicked on overgassed / underdamped as possible problems.
It's good that the gas block splits the blast and diverts the gas the adjustment stops. That way it shouldn't plug up .
I'd load my mags with a few rounds and start testing, adjusting tighter every time you get to the problem, grab another mag, repeat,
That way you will be testing the mags at the same time. You might find a couple that start working after you tighten down on the gas.
Have you tried holding it like a wimp?.
You know how a pistol will screw up sometimes if they aren't fired with a stiff arm.

Toxicavenger said...

Carbine adjustable buffer tube or full length fixed stock? The springs are different due to the length difference. A CAR-length spring in a full length tube will give screaming high BCG velocities. Can be sorted with a new spring or one of the Armaspec plugs. Just a thought...

Anonymous said...

I don't see any description of the problem, only lots of solutions to many different problems. What is the problem you are having?