I am interested in what kind of mods you have completed on your Mini. I have a Syn/ss 14 with about 1K rounds thru it. I have gapped the gas block and dremel polished the chamber mouth. I use PMI 30rd mags with good success. Muzzle brake is presently on order from Cheaperthandirt. Mine shoots about 3-4in at 100yds until it gets very hot. 2in at 50yds. I have owned AR15s over the years but prefer the Mini as IMO it is an improved M1 Carbine. Glad to find this forum as you can see I enjoy discussing the Mini.