Jon,
Would you mind sending the entire rifle back to us? We can trouble shoot each component.
Paul
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Jon,
Would you mind sending the entire rifle back to us? We can trouble shoot each component.
Paul
Could there possibly be not enough back pressure with the BCM comp? I can swap to a BattleComp 1.5 possibly
Have you tried different bcgs after you replaced the bad gas tube?
Anything is possible, but I don't think it's probable. FWIW- I am running a Colt 6920 barrel (.063 port) chopped and grinded with a Bravo Comp, Vltor A5 and -3 buffer and green Springco and it will shoot everything from Hornady Steel TAP (55gr./75gr.), M193, M855 (multiple types) and markm handloads and it runs 100%.
I have had the same exact issue with a rifle a few years ago. It drove me nuts and I spent way too much money on ammo trying to figure it out.
It turned out to be an out of spec gas block. I changed out the gas block and it has run 100% ever since.
Good Luck!
Many 14.5" Midlengths won't run on sub-SAAMI pressure ammo like Wolf, Rem UMC etc. The weakest my BCM Midlength BFH runs on is PMC Bronze and it just barely does that.
Not locking back with 5.56mm ammo has me stumped. It should run, maybe the gas block replacement will fix it.
Apologies if it has been tried and I missed it - have you tried to move down from the 'H' to a carbine buffer?
I have a 18" rifle gas BCM barrel that will cycle on 5.56 with an 'H' buffer beautifully but to run wolf without short stroking I need to step down to a carbine buffer.
My 18in BCM complete gun I use for 3gun I run a H3 and it cycles Wolf 55gr Classic perfectly, even locks back. Same with my 11.5in BCM upper using an H buffer cycles with anything I feed it. Thats why I'm super stumped with this rifle as its the first 14.5 middy I've ever had do this, I've built 6 others for friends/family and they all work. At least it happened to my build and not theirs.