300blk Acr Sbr

Test firing my 300blk Acr. Ammo is Remington factory 220gr subsonic. This test was primarily to check the clearance of the gas system and the bolt hold option after the last round was fired. Rifle specs: Bushmaster Acr Sbr. Noveske 10.2" barrel AAC 762SD-N6 AAC Blackout Remington Defense Acr handguard Geissele SSA-E Aimpoint T1 Lt 660HK Bigdog Standard Ambi charging handle.