The APC PRO models feature dual auto-folding, non-reciprocating charging handles and improved lower receiver ergonomics, including a side-positioned bolt hold open/release and a replaceable M4-compatible pistol grip. They come equipped with Magpul M-Lok accessory slots for versatile accessory attachment. Additionally, the APC9 PRO is compatible with standard B&T magazines as well as Glock and SIG P320 magazines, offering greater flexibility to the user.