I have a Sig MPX K with a few upgrades. The upgrades are a in lead we trust 8" barrel with adjustable gas block, Samson 8" handguard in FDE, Radian weapons raptor-LT sig mpx charging handle, radian weapons talon 45/90 2 lever kit in color np3 coated (safty selector), Geissele mpx recoil spring kit, KNS precision hammer and trigger pin non rotating. The pistol runs smooth and has no issues. The original 4.5" barrel and handguard come with, and the wrench for adjusting the gas block. Comes with two 35 rnd magazines and no pistol brace. The optic and backup sights are not included. $2500 no trades.