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Actually, I do not have the upper. This SP1 had an A2 upper on it, but the previous owner for some reason ruined it by grinding out a huge, deep chunck about the size of a quarter from the lower...

JIM

Thanks for your response. I actually have a couple of the pins that you describe (large on the ends, small in middle--that unscrew). Got them from Bravo Co. If that's all I need, I guess...

I am new to this platform so I have a quick question which I hope is not dumb. I have a Colt SP1 lower ser#164xxx. Will a US M16A1 upper fit. Mainly I am concerned about if the pivot holes line up...

John--thank you again for your knowledge and your fine photos.--charles

John-the US&S that I was inquiring about (a 98% pistol) is 10736XX and it has Keyes grips without reinforcing rings. Very close to your top pistol. Do you mind revealing the serial # of the other...

I have acquired three stone cold mint U.S. & S. pistols in the past several years. All three (serials 1.06; 1.07 and 1.09) have had keystone grips without reinforcing rings. What is the real story...

Greetings--long time viewer and sometime poster from Culver's.