Sorry KHB, you are right. I did mean the bolt carrier was shaved at the rear. Thanks for being on the ball and reminding me to use the proper nomenclature if I want proper answers. Seeing the feed back about M-16 bolts, I'm not to interested in buying any. Once again, this site has prevented a fool from soon being parted from his money. Is there any difference between the actual bolt with AR-15 and M-16?