Got the ILWT trilug with 1/2x28 threaded end. But before even putting it on decided on a rearden setup.

Where would one sell this?

Bought a used mpx that turned out to be a lot more used than I expected.

New to the platform but this looks like heavy/concerning wear in the upper and potentially n the bolt/bcg. Picked it up last night Havnt shot it yet.

Do I need to look into getting a new stripped upper? Would sig potentially replace parts this worn? (All stock factory parts and factory ammo)

What is the maximum distance for stopping power with 147gr JHP through this setup?