Home Forums Hunting & Shooting AR and Tactical Rifles 22", 8 twist, .243 LBC build.

I finally got a chance to shoot the latests AR I built, I built this one for myself. This will be one of my primary RockChuck AR's. Back East I believe they call them Groundhogs, out west it's Rockchucks because they are almost always found in rocky terrain. Anyway I was more than pleased with today's results.

Since this was the first outing with this rifle but I own and have shot many Black Hole Barrels in various chamberings, .243 LBC, .264 LBC, 6x45, 6.5 PCC, 6x6.8 SPC etc. I did my standard break in. 3 shots clean with Butches, 5 shots clean with Butches, 5 shots clean with Butches, 10 shots clean with Butches and then go for it. All the shooting was done from the prone with a bipod and a rear bag at 110 yards.

Here are a couple groups shot today the group on the left was 5 shots with 105gr Hornady BTHP match and CFE223 powder with Lapua cases(Yes, I choked the last round!) The group on the right was 3 shots with the 95gr Berger VLD's and H4895 in neck turned Hornady cases. Both lit with a CCI BR4.





I have noticed that my AR's that I use the heavy billet Maga Arms upper recievers. Side charger type or standard heavy upper receiver have always shot tight.

Today's set up, I didn't have time for a formal range session off the bench and I couldn't stand the wait. So next go round I'll get velocities. Right now I just wanted a zero.





Rifle Specs:

22" Black Hole Weaponry barrel, stainless, 3P (Polygonal).
Chambered in .243 LBC, simply the Grendel necked down to 6mm
Rifle length gas
Fortis "RED" brake/Compensator
Geissele Super gas block
Nitride gas tube
Lancer 16.25 carbon fiber handguard
Mega Arms side charger upper
NIB bolt carrier group with custom side charger machined and installed locally
Grizz Precision Billet lower receiver
Anderson lower parts kit
CMC 2/2 flat two stage trigger
Yankee Hill extended take down pins
Odin Works extended magazine release
MagPul PRS stock with .308 spring and buffer
MagPul Key Mod bipod adaptor
Spikes "Spider" grip
Viking Tactical Key Mod single point/clip sling attachment
Noveske 60 degree selector/safety
AADMOUNT 30mm with bubble level and 30 MOA built in
Leupold LRT, M1, 6.5-20x50 Mil-Dot reticle