Never buy from CAI is my opinion. I bought 3 ak's and 1 feeds, ejects and shoots, one of them the bolt carries rubs so hard on the rear sight block you have to force the piston into the gas tube, so basically 2 of the 3 I bought are thumb loaded single shots, no matter the mag or lube or bolt carrier or piston or gas tube. And if your brand new Century Arms AK doesn't work, too bad, their attitude seems to be , your bought it it's your problem now. I will never, never ever buy from CAI again. They are out and out thieves. But if you like those odds (1 out of 3) you'll get a working firearm, go for it.