03-26-2020, 03:42 PM
Is your stock a rifle length stock or carbine, as in adjustable length or etc? If rifle (A2-ish), then first thing, do not use that carbine spring in your rifle length stock. I don't care if it works (for now), it's bad juju safety wise (unless you have one of those "carbine stock inserts" in the tube as well that shortens the stoke).
The compensator is probably not an issue.
You say there is wobble in the gas block to tube fit-up, I wonder if that tube is even pinned? check that out, kind of a long shot but easy to verify. My probable culprits, losing gas or gas port too small.
A properly made gas block will fit tightly onto the GB journal of the barrel, no wobble, just barely slide on.
Case in point on the gas port. I have 2, 223 wylde BA barrels 18" RLGS, shoot really great but little to no lock back and definitely short-stroking. Near as I could measure their port holes they were the std BA diameter of 0.09375. The IMI 77 gr would cycle fine but virtually nothing else.
So after doing lots of search on the web for BA barrels it comes up that enlarging the port to ~0.100-ish solves this... ie, more gas pressure allowed into the DI cycle system. So I ordered a set of wire-gage drill bits and gradually opened the port to 0.1015 -- result, everything now cycles great. Federal 69 & 77 SMKs, cheap AE 193's, 69 gr Black Hills, IMI, Hdy black 75, everything I shot.
So if everything in the build checks out maybe look at enlarging the gas port. One nice thing about that is if you get 'way too large an adjustable GB can mitigate it.
Need to be careful however on drilling it so as to not mar the other side inner surface/land/groove. I put a cheap aluminum cleaning rod inside so I could hit that but not go too deep and hurt the barrel. Do this even if you have a drill press.
The compensator is probably not an issue.
You say there is wobble in the gas block to tube fit-up, I wonder if that tube is even pinned? check that out, kind of a long shot but easy to verify. My probable culprits, losing gas or gas port too small.
A properly made gas block will fit tightly onto the GB journal of the barrel, no wobble, just barely slide on.
Case in point on the gas port. I have 2, 223 wylde BA barrels 18" RLGS, shoot really great but little to no lock back and definitely short-stroking. Near as I could measure their port holes they were the std BA diameter of 0.09375. The IMI 77 gr would cycle fine but virtually nothing else.
So after doing lots of search on the web for BA barrels it comes up that enlarging the port to ~0.100-ish solves this... ie, more gas pressure allowed into the DI cycle system. So I ordered a set of wire-gage drill bits and gradually opened the port to 0.1015 -- result, everything now cycles great. Federal 69 & 77 SMKs, cheap AE 193's, 69 gr Black Hills, IMI, Hdy black 75, everything I shot.
So if everything in the build checks out maybe look at enlarging the gas port. One nice thing about that is if you get 'way too large an adjustable GB can mitigate it.
Need to be careful however on drilling it so as to not mar the other side inner surface/land/groove. I put a cheap aluminum cleaning rod inside so I could hit that but not go too deep and hurt the barrel. Do this even if you have a drill press.
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