Greatwest Gunsmithing in Salem AKA "Gundoc" on the above referenced forum did wonders for my Mini. The Ultimak Rail along with a Bedding job and strut should provide teh accuracy improvements your loooking for. IMO the Promag Mags are equivilent to the factory mags. I cannot tell the difference in either appearance or performance. The 20 rounders that is. Good Luck.