Mostly good - Command Arms Accessories 3 & 5 Position Folding Forearm Grips

I bought this for a Sub 2000 because like the gun, it folds up. I also thought I might have a use for multiple positions. Turns out I don't need multiple positions, but this thing folds up nice and tight so I can fold the Sub 2000 easily into its case.

The only downer is that unfolded, it has a little front-to-back wiggle. When shooting, however, that's unnoticeable.