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6/27/2013 3:25:36 PM EDT
So I'm getting ready to build my first upper (always bought assembled uppers) for my SBR mk18 build. All I need is an upper but prefer one with M4 feedramps; do A3/A4 uppers have m4 feedramps? I know some like Daniel defense say they have m4 feedramps but didn't know if that carried over into other manufactures.

Thanks!
6/27/2013 3:33:20 PM EDT
[#1]
Most of the time a receiver called "4" has extended feedramps and one called "3" does not.  Not an iron clad rule, have to look at the specifics of the item.

Kinda hard to find receivers without extended feedramps anymore.
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