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10/20/2017 1:01:18 AM
9/22/2017 12:11:25 AM
Posted: 9/23/2005 12:23:57 AM EDT
I just received a brand new colt upper from CDNN. the question i have is which upper did I get? Because in their add it says Colt AR-15 sp1/M16A1 upper, new factory. Is there any diffrence in these two uppers or are they both the same uppers. If diffrent please list the diffrences because I would like to know which upper I have. Thanks for all info!!!
Link Posted: 9/23/2005 12:27:34 AM EDT
SP1 uppers lack a forward assist (and the associate bolt with the pawl cuts) and can have a 3 prong flash hider or the A1 bird cage.


M16A1s have the foward assist and birdcage flash hider.
Link Posted: 9/23/2005 12:43:41 AM EDT
Link Posted: 9/23/2005 1:44:24 AM EDT
The M16A1 upper is more versatile than the Colt SP1 upper since the small pin hole allows you to mount the upper on any lower from Bushmaster, Armalite, DPMS, etc. Buy an large hole SP1 upper and you need an adapter or need to find a large hole AR lower.
Link Posted: 9/23/2005 1:54:10 PM EDT

Originally Posted By badhand1:
I just received a brand new colt upper from CDNN. the question i have is which upper did I get?



M16A1 upper.
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