I saw them in their online catalog . Are they any good? Are they to big and balky? Thanks in advance.

Anybody actually used them???

Good question I'm curious too.

The forty rounders you see in their catalog are not made by Bushmaster. They are after market crap and should be avoided. You'll see the same mags for sale in Cabelas. I actually have one for some reason, and it works ok, But they realy make no sense. Ever try firing an AR with a mag like that from the prone position? And thats probobly exactly where you will be when the sh** hits the fan. This is why people like the twenty rounders so much.

I agree with Tobin, I ordered some and quickly returned them, they were black shiny steel mags, and just felt cheap, the baseplates weren't stamped at all. Stick with the USGI, or Beta-C's if you want higher capacity.