A few failures to feed/failures to lock back on empty, but that’s not something that is abnormal for a brand new gun… especially a rig you string together with random parts. After about 60 rounds everything was gravy! My only real complaint is just that the rail height is extra high so milspec 12oclock position pic rail sits low in relation to the rail on the receiver. My safety selector and trigger fit in without issue. Safety is a very positive tight fit. Bolt and action is very smooth and in my opinion the charging handle is a great size with nice texturing.
All in all it felt like I was building an AR type rifle, and I’m pretty happy with the gun. It sparked much joy.
SIG MCX. Most of the better 1913 type folding stocks I have seen are all for either the MPX or the MCX. Very solid, well engineered.