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Old January 10, 2013, 10:49 AM   #1
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Join Date: June 16, 2007
Location: Ory-gun
Posts: 506
AR-15 Upper and Lower compatibility

Are most uppers and lowers pretty much interchangeable? i bought a Rock River Coyote Carbine Upper, i dont have a lower yet because im out of the country and the prices are way to ridiculously high right now. but i have a Bushy back home thats a full size XM-15E2S 20'' model. could i just swap out the uppers?
Molon Labe
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