VFC HK416CQB lower receiver.
Not compatible with KA M4 upper - KA upper front tab is too thick. Tried it with a KA SR15 upper - same thing.
Not compatible with G&P LMT upper - the LMT upper is too short to hook up to the back of the VFC receiver. All G&P uppers are roughly the same so you're out of luck on that
Not compatible with Madbull Noveske lower - same issue with G&P. Also the hookup system is completely different (CA 2-pin system)
Last edited by Stealth; January 28th, 2013 at 14:09..
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