Finally had a chance to shoot my Radical Firearms 8.5-inch 300blk upper purchased from Primary Arms. I fired just 14 rounds from the gun this evening at the 50-foot indoor range. The ammo was my initial handload for this cartridge. LC brass, Federal SR Primer, Speer 150gr softpoint, flatbase bullet, 15.5grs W296, OAL 1.165-1.168.
The loads locked the BCG back reliable, fed from magazine reliably, and ejected from the rifle reliable.
Using a Weaver V3 I was able to zero the scope in 7 rounds and thereafter print a 7-shot group under half an inch.
I think that is a good initial showing and I am very pleased thus far.
The Upper has a Daniel Defense BCG, a BMC Gunfighter charging handle, and a UTC ultra slim pro handguard, all mods I made to the stock upper, of course. I also replaced the A2 flash hider with a Low Concussion Linear Comp. from custommuzzlebrakes.com.
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