I have one (1) Olympic Arms 9mm upper receiver assembly, A2 style, with commando flash suppressor, bolt assembly and charging handle, tear drop foward assist and mag adaptor. I have several Sten magazines and one 30 round Oly Arms see thru magazine. I've fired about 200 rounds through this unit. No problems. $550.00 Delivered. SORRY no California sales on the high capacity magazines. EMAIL FOR PICS.