B&T, APC9K PRO, Semi-automatic, Pistol, 9MM, 4.5" Threaded Barrel (5.5" with Tri-Lug Installed), Black, 33 Rounds, 1 Magazine, Glock Magazine Compatible, Tri-Lug Adapter Included The APC PRO series brings a new level of performance and adaptability to the APC platform. All models feature a dual auto-folding, non-reciprocating charging handle, improved lower receiver ergonomics including a side positioned bolt hold open/release, removable M4 compatible grips, and Magpul M-Lok accessory slots. Comes with one 33 round Glock magazine.