my buddy got this colt..and she is a beauty colt ar15a3...i had a few off brand and some rem and some wolf and some Winchester shells i have piled up over the years...they ran through with no problem and we were puttin just about every other shell different (wolf,rem, Winchester) in every clip..where as my other buddies was jammin now and then... his is a ruger ...and is still very nice, but i believe i like that colt better, but i'd take either one.