yesterday and i gotta say i sure am glad i didnt try ceiner again.its a stainless version of cmmg unit that ive only seen in brownells in carbon steel. price was like 219 with a 25rd mag and xtra mags are 19.99. cmmg testfires each unit before shipping and the mags are just great. all i did was plug this sucker in,load the mags and go! havent checked for accuracy yet too busy having fun shooting my ar like i havent been able to afford lately. gotta say this is the cleanest version of the atchisson design ive seen.two thumbs up.