AR Sponsor
Posted: 8/3/2012 4:36:28 PM EDT
|
Bought these in a small parts lot on ebay listed as SP1 parts. Would like to find out what these pins are and what rifles they go too, not sure if they are all SP1 parts.
The one on the left is a SP1 large hole pivot pin, .315". The middle two are .315" and have a detent ball in them, the one on the right is .245" and the head is ground flat on the one side. Assume the rest are pivot pins, want to know which rifles they fit. 
Next pins are roll pins. Silver one on the left is .077 long and .129 in diameter, center five are .625 long and .132 in diameter, one on the right is .745 long and .130 in diameter. Are these FSB roll pins? What is the purpose of the one on the left? Is it even used on an AR15? 
Most of the parts I got in this lot were pretty generic AR15 stuff, had a nice A1 grip included. Thanks in advance! |
|
Quoted:
Bought these in a small parts lot on ebay listed as SP1 parts. Would like to find out what these pins are and what rifles they go too, not sure if they are all SP1 parts. The one on the left is a SP1 large hole pivot pin, .315". The middle two are .315" and have a detent ball in them, the one on the right is .245" and the head is ground flat on the one side. Assume the rest are pivot pins, want to know which rifles they fit. http://i374.photobucket.com/albums/oo184/mmerrill64/IMAG0146.jpg http://i374.photobucket.com/albums/oo184/mmerrill64/IMAG0147.jpg Next pins are roll pins. Silver one on the left is .77 long and .129 in diameter, center five are .625 long and .132 in diameter, one on the right is .745 long and .130 in diameter. Are these FSB roll pins? What is the purpose of the one on the left? Is it even used on an AR15? http://i374.photobucket.com/albums/oo184/mmerrill64/IMAG0148.jpg Most of the parts I got in this lot were pretty generic AR15 stuff, had a nice A1 grip included. Thanks in advance! Pivot Pins left - factory SP1 middle 2 - aftermarket SP1 replacements, popular b/c you didn't need 2 screwdrivers to take them apart right - aftermarket to replace later Sporter/Sporter II pins, they were milspec but the fence wasn't drilled for a spring/detent so they used the SP1 style with 2 screws. the head has a flat so it can sit against the fence. |
|
Quoted:
Thanks Boywonder! Any clue on the roll pins? FSB maybe? check here for ar15 roll pin sizes: http://www.biggerhammer.net/ar15/pins.html |
AR Sponsor