Adapter drops into the top of the receiver and virtually impossible to remove unless the upper receiver is opened. Ideal for users using Uzi and Colt type magazines not concerned with having the bolt hold open feature. Uzi magazines require modification. 9mm Colt pattern system. Construction: 6061-T6 Billet Aluminum body MIL-A-8625 "F" Type III Class 2 hard black anodize standard 9mm Colt type ejector parkerized steel components Features: Colt pattern system that uses standard Colt type and modified Uzi magazines tapered and funnelled magazine well for smooth insertion and minimal rotational movement steel feed ramp is designed with scalloped surfaces to provide superior functioning even with hollowpoints Optional installation of a 9mm bolt catch will allow for last round bolt hold open function but adapter will NOT be readily removable
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The top loader magazine conversion block by Hahn is, to my opinion, currently the best mag block available on the market. I've had this block before and never had any issues when using my 9mm conversion set. I recommend this block to anyone before any other brand or type.
Runs good with ball ammo, but malfunctions every 10 rounds or so(fail to feed) with hollow points.
started off with a spikes magwell block and had nothing but problems with it. threw this top loading mag block in a pew pew all day long. highly recommend