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Posted: 1/11/2008 8:25:44 PM EDT
| in a week or two i plan on ordering ar parts for my first build. so i was lookin to get a complete rra mid length upper reciever but the question i had was will the lower recievers pins fit in the uppers pin holes . if not what kind of reciever will work? |
Yes they will fit (unless you have an older Colt lower that has bigger pins, then you would need an adapter pin). 
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check this thread out, it shows how some of the proceedures have to be done, specifically, removing your old, std FSB: www.ar15.com/forums/topic.html?b=3&f=4&t=226782 FWIW: the toughest part is removing the std FSB, esp on certain models, like oly arms and bushy |
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