Designed for quick caliber change between 5.56mm and 9mm with minimal effort. Adapter loads in from the bottom of the magazine well and secures with a tension device. Ideal for users using Colt magazines and frequently changing between calibers that desire the bolt hold open feature. Holds the bolt open on the last round with Colt magazines. Features: Colt pattern system that uses standard Colt and modified Uzi magazines; Bolt hold open on last round with Colt magazines; Tapered and funnelled magazine well for smooth insertion and minimal rotational movement; Built in Bolt Catch Actuator is designed to allow for fouling and fine debris; Tool steel Feed Ramp is designed with scalloped surfaces to provide superior functioning even with hollowpoints.
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Really good for the price easy to install just tighten the Allen head to seat it in and test your mags out and run. But may have to file your mags feed lips if using it with certain bolts and certain mags.
-must have been missing a piece, it would not tighten in to the lower. i removed the set screw and made a small piece to push on the ball inside out of a wood screw.
-ran 150 rounds with no problems.
-asc mags( ran fine after filing the magazines feedlips to clear the bolt)
-kaw valley 16" barrel
-kaw valley heavy buffer and pcc/308 spring
-would recommend, just be sure it is tight in the lower
This was my first 9mm build. This mag well adaptor is great . Gives me the flexibility to revert back to a normal lower. Works great with Asc mags (only ones I've tried so far) bolt hold open on last round every time . Couldn't be happier
I bought this to replace the promag block which wouldn't breed my gun at all! RRA block is great a works flawlessly after adjusting to your gun!