Commander Faschisto commented on August 08, 2016
Off-label success! RZE doesn't yet list the Unimag for the .450 Bushmaster, but it works:
Well, we seem to have a new, functioning alternative mag for the 450b! Ran it through my Remmy R-15 with the Max-1 camo dip. Tight fit in the mag well, but not excessively so...I think the drag on the mag was due to the camo dip overlap up into the mag well on my particular rifle. If I cleaned the paint out of there, I think the drag on the mag (hey, that rhymes!) would go way down, but I'm pretty sure this mag would still be somewhat snug fitting. That's just a minor complaint I have with my rifle, however.
Full and partial mags functioned just fine, no observed problems...didn't fire a large number of rounds, because everything seemed to work as advertised.
Bolt hold-open worked fine.
Top round position looked just right for the 450b, with the tip slightly "nose up" when held in the mag lips.
Manufacturer recommends loading the mag carefully, so that the rounds double stack correctly and the top round is centered in the mag lips. Did that, and it worked fine. Whooda thunkit?
I noticed while initially hand-cycling some rounds out of the mag that the mag lips were scratching the brass, so I smoothed them over with a 600-grit sanding stick and some metal polish on a Dremel wheel...problem solved.
Finish, construction and overall quality seem top-drawer.
Summary of my experience with the RZE Unimag: Quality product that works well with the 450 Bushmaster!