The Sig Sauer MPX Carbine combines all of the features from the original MPX into an all new rifle format. This brand new carbine from Sig Sauer includes a KeyMod Rail System, flip-up sights, a muzzle brake, and a collapsible stock.
I have had my MPX for approximately 2 weeks and 500 rounds. It has performed flawlessly. I have used gen.1 and gen 2 mags and both performed without issues. This is a great rifle and fun to shoot. I own 3 Sigs, and love all 3.
I received the firearm back from Sig with a note saying they replaced the handrail. The handrail is now not mounted in line with the receiver and is off by 1/16 of an inch. The handrail now wobbles last and right a half inch. At this point I'd be willing to keep anything that was not complete garbage to not deal with their customer service again but the gun is not usable as is.