I recently ordered 4 10 rounders from RRA and receieved the new style Bushmaster 10 rounders. They are a sawed-off GI 30 rounder with a permanently attached black plastic baseplate. They are good mags, just can't be taken apart. They also look kinda' funky because the top of the mag is straight, but the bottom fourth of the body curves. 30 round mags are the most common. RRA charged $18.00 a piece, I believe.