Sounds like you got one of Colt's "LEO" rifles, which are "officially" available only to government agencies . . . though they do show up with some frequency in regular channels through the gray market. (gray market = 100% legal, but against Colt's asinine marketing policies.) Too bad Colt is still deviating from milspec where they don't have to with oddball pins etc. No doubt it's otherwise well made, but I hope you never have to seek Colt's factory "service." I can't legally buy a post-'86 select fire . . . from any manufacturer.