6 ARC Upper Build: 18” PVA Osprey (Rifle +2”) + San Tan Tactical Billet Upper + SOLGW M89 Rail
- By TonyAngel
- Semi-Automatic Rifles
- 81 Replies
Man, I'm very hesitant to advise anyone to do a permanent modification just based on what's posted in a forum. I've had more than one occasion where someone brought me a rifle and I had one thing in my head based on what I was told, only to find that it was something completely different once I got my eyes on it.Thanks Tony. No worries, take your time catching up. I love your idea for using the suppressor but unfortunately I live in California so that’s not really an option.
TLDR version is it’s an 18 inch 6 arc barrel with rifle +2 gas system (.093” port) so it has pretty short amount of dwelltime already. I’ve tried shooting with different mags different, different bcg’s, checked gas tube/gasy key for obstructions, tried set screw & clamp on gas blocks, different uppers, different lube, etc. and never resolved failure to feed or failure to lock back and at best (factory ammo with clamp on block) have gotten intermittent ejection.
If any ideas pop into your head once you’ve had time to absorb the thread feel free to share them!
I already have a 2.5 mm bit on hand that I can use to drill out the port to around .098 inches but I’m holding off until I hear back from Josh at PVA to see if he and team may have some other things to check for or ask me to send the barrel in etc..
Still, +2 rlgs on an 18" barrel is gonna make for a very finicky rig. What I'd do if I were you is send it back, tell them what ammo you want to run and let them make it right.
Assuming that all that has been discussed here is accurate and nothing has been missed, what I would do if this was my rig is blow out the gas hole 3/1000 and see what that gets me. Mind you, I was once asked how I come up with such cool builds and a friend of mine commented that I'm not afraid to f@$k sh!t up.
I have a couple of rigs that are intended to run when subjected to abuse. On those I purposely over gassed them and reined in the gas with a riflespeed gas block. I dont think you're going to ruin anything just going 3/1000 over what you have.