This is a like new Gen 4 Glock 40 MOS in 10mm. Comes with everything from the factory, plus a 3 point adjustable trigger, adjustable block, Zev springs and bar, medium weight firing pin spring, co witness sights, and matching red trigger and back plate. This is a GREAT gun for the range, and is set up and ready for your RMR or other red dot. Asking $900, always looking for trades, a couple smaller guns, or +/- cash.