9mm upper change

[smith m4]

any ammo feed problems with the 9mm AR's?

[C4IGrant]

any ammo feed problems with the 9mm AR's?

There can be (just like there is with standard AR's). My RRA runs perfectly though (even with a Beta Mag).



C4

[vinesr6]

I remember seeing M60joe's pic of a 9mm barrel w/a feed ramp. Looked pretty neat.