On another note I see that B&T is making a "NEW B&T APC-9 Pro. It offers a new lower, with an interchangeable M4 style grip which is interchangeable with any AR15 grip. The APC PRO also accepts "Glock lower" (APC9-G) that uses Glock mags. Its a post '86 NFA item here in the US, so they aren't courting the civilian market.