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Posted: 8/26/2004 4:02:35 PM EDT

Thanks for stopping by my little thread here. Here is the question, I know what accessories are used with the SOPMOD, but my question is what internal modifications are made with the rifle? Is it a Colt lower or FN? Also, what type of upper are they using? I have searched far and wide with no luck. Any and all help is appreciated.

Link Posted: 8/26/2004 5:34:18 PM EDT
Colt is the only contractor making the real M4's for the Gov't. They hold the exclusive rights as of now.
Link Posted: 8/27/2004 1:54:30 AM EDT
All current M4/M4A1's are made by Colt and have flat top upper receivers.The early M4's had A2 upper receivers.The M4 has a burst trigger gruop and the M4A1 has a auto trigger group.SJR556.
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