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9/19/2017 7:27:10 PM
Posted: 4/8/2006 4:53:47 PM EDT
I recently acquired a Colt SP1 with a 5 digit serial number. On the side of the reciever it's stamped .223 Rem. Two fairly reputable shops have told me it has the nato chamber. Is there a way to tell for sure which chamber I have?? I have a supply of surplus ammo but I don't want to shoot it till I find out for sure which chamber I have.

Thanks
Link Posted: 4/8/2006 5:14:14 PM EDT
I believe SP1's have the SAAMI chamber, hence reliability issues and such.
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