This is a nice "Budget Tactical Sport". It has a steel frame, steel slide, aluminum grips. SAO-only trigger. The trigger was on the good side, but not excellent, out of box. The slide was rough out of the box -- the hammer had a bad rough finish -- but with a little love and lube it is slick as can be now. It has adjustable trigger pre and post travel screws which is a nice touch. The trigger is on the heavier side for a gun like this, but it accepts CZ75 trigger and sear springs (not TS/Shadow 2 springs!). Check out Patriot Defense for those. It also accepts standard CZ75 mags with over 17 rounds. Notes about that: the CZ shadow type mags are different, and the 19 rd mec gar CZ75 mags are actually 17 rd mags with a big baseplate. The baseplate won't fit in the K12's magwell without modification. I got those 19 rounders to work by removing some material on the baseplate. SARUSA also sells extra mags like the ones that come with the gun. Finally, the EGW EAA Super Sight mounts work for this gun, and so I put a Leupold DPP on mine. Mine hasn't had any failures and is a good shooter. I shoot it the cheapest russian ammo I can find and it shoots it fine. All my friends want one now haha. For the price this is a heckin bargain.