NEVER BUY A COLT LOWER .... I repeat ... NEVER BUY A COLT LOWER!
Colt lowers and uppers are completely out of spec with anyone else in the industry. You CANNOT interchange random AR-15 parts with a Colt Lower or Upper unless they are specifically designed for a COLT. ie: You cannot install a standard lower parts kit into a Colt Lower. The trigger retaining pin is much larger for a Colt lower, and will be too large for a standard lower receiver trigger retaining pin.
Also, Colt lowers will not match up with standard uppers! I have NEVER been able to match a Colt lower up to ANY of my uppers and have it fit correctly.
Your best bet is to buy the cheapest lower you can find. I have never had ANY issues with any of the cheap lowers I have bought. ATI, Doublestar, and quite a few other companies out there make standard lower receivers.
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Admiral Isoroku Yamamoto - “You cannot invade the mainland United States. There would be a rifle behind each blade of grass.”
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