Will a Colt LE6920 upper fit on a MT6400c lower? Is front pin hole size the same?
Will a Colt LE6920 upper fit on a MT6400c lower? Is front pin hole size the same?
Last edited by shrimpcaptain; 07-30-12 at 11:06.
it should.
a friend has a mt6400 with MTM40xxxx s/n and the pin is milspec size
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Yes they are the same.
Thank you both for the info. I'm planning to get another colt upper for my MT6400c. Here she is, I had ADCO install an A2 FH.
I bought a MT6400 lower and put a 6921 upper on it sold it and got one of the new Colt M4 carbine Cal 5.56 Marked ones the MT had large FCG holes wasn't a fan of that but it worked fine
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