Quote:
Originally Posted by Eeyore
Basically a 416 upper is the same as a M4 one except for the rail system. As long as you choose a brand that compatable with the gun it should be no problem.
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Not exactly. They are compatible as long as you stay with the same brand (exemple: JG HK416 upper on JG M4 lower) but the HK416 upper receiver has several different features, so installing a 416 rail system on any M4 will NOT work.
As you're in the US, i'd advise you to just buy a JG HK416 or a DBoys HK416 (depending on the brand of your gun) and get rid of the lower. HK416 uppers are not sold separately.