PISTOL: AERO PRECISION MODEL MODEL PISTOL, SERIAL NUMBER PTL03356, SEMI - AUTOMATIC, 300 BLACKOUT, BLUE / CCH, CASE NOT INCLUDED, 9" Notes: Aero Precison / Brother LA Arms Model Pistol .300 Blackout Pistol. Comes with one magazine. Made by Brother LA Arms. Aero Precision Model Pistol Lower Receiver. Sylvan Arms Folding Stock Adapter. 7.5" Barrel. 1/8 Twist.