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Posted: 7/12/2007 5:58:05 PM EDT
This came with a transferable sp1 the only markings are on the bolt and read 107683 RM 
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M261 conversion kit. Olympic Arms also manufactures similar units but I believe yours is a surplus M261 kit. The magazine can be pushed down into a standard AR mag. Many others will have more info. I have the Oly version and love it, my SBR'ed 11.5" 1/7 barrel actually shoots .22s very nicely. Scott |
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