u/93739284

I have a s&w m&p 2.0 compact. The thing shoots fine but I wanted to get a threaded barrel. I got the factory threaded barrel that’s meant for the compact. Upon shooting I noticed it had issues with lock back and at one point failed to eject the round. Do I have an out of spec barrel? Do I need a lighter spring or polish anything? (Ps I was using 124g blazer ammunition)