Originally Posted by jeepcreep927
Simmunitions sells a complete upper for their sim rounds. I have never seen a complete "blue", including the lower.
I know when we purchased SIMS for our Team, we bought just the uppers for the M4 and also the Glock 19 version for the HG. I do not think you can purchase the whole M4 due to it using a lower. With our SIMS uppers, we just dedicated some of our old M-16's as our SIMS guns since they are no longer utilized.