Love my p16 limited. Runs like a champ with everything I throw through it. It is a great entry level USPSA Limited gun. The MecGar mags wont take extensions and lock into the gun so don't bother with those unless you mill the grip down. If you want more than the 4 mags it has look into the obvious MBX choices, Canadian mags are hard to find and are getting expensive. I'm pretty sure it will fit standard 1911 holsters as well, I run mine in an older bladetech and it fits great.