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Jay
Posts: 4,629 Senior Member
LR 308 is finally done
Jay
Posts: 4,629 Senior Member
In my other thread, I went over the plan for this build and sought some advice. I got good advice and have been picking up parts here and there. Everything finally came in and the gun is finished. Here’s the link to the other thread.
https://forums.gunsandammo.com/discussion/36676/308-win-ar-build-thoughts/p1
And heres a pic of the finished gun. In my next post, I’ll give a general list of the parts used.
https://forums.gunsandammo.com/discussion/36676/308-win-ar-build-thoughts/p1
And heres a pic of the finished gun. In my next post, I’ll give a general list of the parts used.
Replies
Aero Precision upper and lower receivers and bolt carrier group
Ground Zero Precision “Ballistic Advantage” 16” barrel, 1:10 twist
SLR adjustable gas block
AR Stoner muzzle brake
Vortex Strike Eagle 1-6x24 scope and Vortex cantilever mount
LaRue Tactical MBT trigger - 2.5lb first stage, 2lb second stage
Hogue 15 degree grip
DPMS A2 stock
Trinity Force 15.5” handguard.
N454casull
I was able to get it out to the range briefly today. The only ammo I had on hand was some factory 150 grain Winchester Super X. All the hand loads I have are for the Weatherby and Savage and are too long for this gun. But, this was mainly to get the scope at least close to dialed in and function check the gun. After getting the scope in the ballpark, I had 6 rounds left. Fired two three round groups at 100 yards. The gun is not a fan of this ammo and/or the trigger nut was broken. I didn’t measure the groups, as it wasn’t really impressive and not the ammo I plan to use in this thing. But I’d say just over 2” first group and just over 1” second group. I’ll clean the barrel up and load some test loads for it. I have a few hundred 168 grain Amaxs here to play with and try to get those groups shrunk down.
On the plus side, the gun functioned flawlessly. Fired every round, no malfunctions. The muzzle brake works extremely well. Very little recoil and the gun comes straight back on recoil. I wasn’t holding onto it and it never came up at all. Left hand holding the rear bag, all fingers on the right hand on the right side of the gun, slight pressure back into my shoulder and focus on fundamentals. I got a video of a 3 round string. Can’t post, as I don’t do YouTube. This gun recoiled about as much as my 243 bolt gun and it doesn’t come up off the bag at all.
Im unsure of how to tune the gas block at this point. It is 15 position adjustable. I simply closed it all the way, then opened it 7 clicks. Almost half open, iow. It was leaving the brass in a pile about 2 feet away, my 3-4 o’clock. When I find a load it likes, I’ll finish dialing it in. I’ll need at least a 5” long Allen wrench to reach the adjustment screw from the front of the handguard.
I fired the first round at 25 yards, just to get on paper. 4” low, 4” left. Cool. A bunch of clicks later, 4” high, 4” right... Scratch head.... How did I go double what I was supposed to go???
1/2 moa clicks on this scope....
When I tuned my gas block I started at maybe five clicks open and fired a couple shots, open a click. When I got far enough that the rifle cycled reliably I went one more click, just for luck.
Dad 5-31-13
https://davidsondefense.com/aero-precision-m5-lr-308-master-mayhem-assembled-upper-20-match-308-win-1-10t-qpq-nitride-medium-tapered-barrel-premium-19-m-lok-handguard/
Hi. I’m Zee. I’m a Gun-o-holic.
Dad 5-31-13
The next two loads opened up pretty dramatically. I won’t even bother posting pics. 2”+ groups. It definitely didn’t like those loads. I had a feeling it would find another accurate spot somewhere higher and was hoping the 42 grain load would be it. I wasn’t disappointed.
I cut that section of the target backer out and out and took it home to measure it. .49” center to center. Thats at 2.175” BTO length. I’ll take that. Now, I need to load up the rest of my brass with that load and check velocity next time out. Then I can get my initial ranges on the BDC reticle marks and verify them.