PSA 7" Marauder Upper for AR15 pistol or SBR built chambered in 300AAC/blackout. Compatible with AR15 Lower and BCG. Purchased for a pistol build, tested it on my AR15 Lower, shot about 40 rnds and was impressed however im straying from a 300 blackout built and looking to buy a CZ Scorpion or Build a AR in 9mm. Will include 3 boxes of ammo. My loss is your gain. $200 firm.