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to provide a fast, secure, and enjoyable experience. by Scott, from CA, United States Asked on November 4, 2020
The VAST majority AR-15 receivers are “small pin” receivers (this is mil-spec), but some older Colt AR’s are “large pin” receivers. This refers to the size of the FRONT takedown pin hole. If you have any question, just measure the front takedown pin hole. If it’s.25″, then you have a small pin receiver..315″ is the large pin.
