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1/25/2018 7:38:29 AM
Posted: 4/5/2002 3:13:50 PM EST
[Last Edit: 4/5/2002 3:15:43 PM EST by 308wood]
would someone please explain the SP1 front pin thing to me. i think old colts have a large front pin (with a slotted head for a standard screwdriver) and new (post-ban) colts have a small front pin but today i saw a SP1 with what i remember to be a small front pin that could be pushed out. is this possible? was it really a small pin? will this work with a standard M4 upper without a special converting pin? thanks in advance.
Link Posted: 4/5/2002 3:57:23 PM EST
All Colt SP1's had a large front pivot pin. However, they do make a large (.312") pushpin with an integrated detent, for these rifles, and it is likely that is what you saw.
Link Posted: 4/5/2002 4:08:00 PM EST
thanks, if that is the case. I have a "large (.312") pushpin with an integrated detent" can I have a bushmaster m4 drilled out to fit? or am I stuck with these types of uppers? or going with some sort of conversion pin?
Link Posted: 4/5/2002 4:17:26 PM EST
Link Posted: 4/5/2002 4:22:03 PM EST
Get a conversion pin for small hole upper. Be warned, they dont always give a good fit. I was not happy with mine. Many people get a large hole upper receiver used, and then assemble the upper the way they want it. Les Baer/Daniels Defense is making new production large hole uppers. I would much prefer this solution to a conversion pin, but there a many out there using these pins and are happy with them.
Link Posted: 4/6/2002 5:19:51 PM EST
308wood, I have a Bushmaster M4 upper on an SP1 lower. I bought an offset pin from Bushmaster, and the upper and lower fit is remarkable. Guess I lucked out, but the upper/lower fit is better than some FN-manufactured M16A2's that I've fired.
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