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Legacy Member
Dating an SP1 upper?
I got bit by the retro bug and while building an M16A1, I picked up a SP1 stripped upper. I looked at a few sites but I'm still confused on whether or not it's an early or late upper. It makes a huge difference on the parts used on the build! Thank you!
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Warning: This is a relatively older thread This discussion is older than 360 days. Some information contained in it may no longer be current. |
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01-26-2016 06:48 PM
# ADS
Friends and Sponsors
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Advisory Panel
[QUOTE=garrettbragg12;353820]I got bit by the retro bug and while building an M16A1, I picked up a SP1 stripped upper. I looked at a few sites but I'm still confused on whether or not it's an early or late upper. It makes a huge difference on the parts used on the build! Thank you!
QUOTE]
It appears to be a fairly early Colt upper. Later uppers had letter codes in the right side webbing under the rear sight.
Attachment 69193
It looks like you have faint Colt inspection markings, similar to this:
Attachment 69192
Is that an SP1 upper, or an early AR15/XM16 upper?
If the front pivot hole is .250" it's AR15/M16, if it's .316" is SP1.
Last edited by Lee Enfield; 01-28-2016 at 05:13 PM.
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