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I thought all holes were small holes, but I digress. While trying to find an upper for my AR15 I keep seeing referance to big holes and small holes. Who has what and when did it happen? I have 2 Ar 15s and both pins measure .250 is this a big or small hole rifle. What can you do if you have one type upper and the other type lower?
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.250 is standard. Pre 1985 (+/- a little) Colt had a .250 hole and a weird one with a screw in the front. Post 1985 Colt had two large holes with screw until recently. Current Colts have the .250 hole. Everyone else has .250 holes.
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I would suggest to stay away from the Colt Upper that way you will not have to worry about the pin issue period.
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There are adapters available to mate large hole lower to small hole uppers and small hole lowers to large hole uppers. Also, if you have a large hole lower and are building an upper or just want a large hole upper or want a flat top, Daniels Defense sells upper receivers with a large front hole/flat top
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QUOTE (avmech @ November 27th 2008 9:24 AM)
Also, if you have a large hole lower and are building an upper or just want a large hole upper or want a flat top, Daniels Defense sells upper receivers with a large front hole/flat top
Thanks for that info. I'll add it to my memory bank.
November 26th 2008 8:09 AM
