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AR15.COM
5/14/2009 4:08:32 PM EDT
What is the difference between a regular one and the MK4?

Any pics?

TIA:ARC
5/14/2009 4:25:44 PM EDT
[#1]
The MK4 is a standard milspec lower with the exception of the mag well being milled instead of broached.  I don't have a picture on file but should be getting one shortly.
5/18/2009 3:52:55 PM EDT
[#2]
They also mill the markings instead of stamping them.  They look nice and clean.