thenorsepole

You should let Patriot Surplus know.

I did check the torque on the barrel nut and it was within spec. Rattle can camo job based on the colors in my AO (copperheads disappear in the leaf litter). I should get this out to shoot in the next couple of weeks so I'll post up here how well it does.

CMMG Mk3 upper (Allright, I heard someone snickering), Aero complete lower, Magpul ACS stock, BCM Mod 1 grip, BCM keymod shorty, BCM keymod sling mount etc, etc, etc. Just waiting on the Geissele SSA-E and the BCM Mod 4 CH and it's done. We'll see how the CMMG barrel handles a few loads when I can stretch it out beyond 100m, but until then I am considering it complete. I'll get some scrim for the scope, I would rather not paint it.

Just ordered an AP M5 lower w/ adjustable stock. Will replace the stock with a UBR at some point. Merry Christmas to me!!! Shibiwan had a nice price on a MK3 lower, but for a few $$ more I won't have to assemble another stripped lower. That shite gets old after a while.

Cherry Log

Roger that shibiwan. I checked the upper out as soon as it was unboxed - looks like someone at CMMG was doing their job that day. Perhaps a new hire? Barrel nut is nice and tight from what I can tell without the tool. Once I get the tool in my hands I'll will re-torq so I can see it with my own eyes. Keymod handguard was nice and tight although I did pull out the stick of blue locktite for my own peace of mind. Seems like a good upper for the price although it's just a honking chunk 'o metal until post-Christmas allows for the lower. I will get another BCG for it and use the stock BCG for backup/parts.

Thanks for the welcome edgecrusher. I've been lurking here for a while and naturally, 15 minutes after I posted my receiver question, I find the discussion and answer I need under "What you need to know -> Buffers and Springs". No wonder I haven't won the lottery yet.

Just started the process of assembling an AR in 308. As for why? The Readers Digest version is because I "need" one of course. I have lots of AR's in 5.56, 300Blk and even .50Beo, but am looking to stretch my shooting legs a bit. Truth be told, I bought a Burris Eliminator III for a 20" BCM and realized it's too much scope for 5.56 so let's build a rifle around the scope hence the .308 project. Starting with a CMMG MK3 18" upper assembly and am eyeing an Aero complete lower. I will replace the trigger with an SSA I have laying around, the pistol grip with a BCM MOD 1, the charging handle with a BCM Mod 4. The question I have centers around the buffer tube. I would like to go with either a UBR or PRS. Springs and buffers are specific to .308 but what about the tube itself? Can I use a rifle length (or carbine length for that matter) buffer tube from a 5.56? I have googled and searched several sites but never found a definitive yay or nay on this.