M16/AR15 Bolt Hold Open for UZI 9mm magazines


A groove is milled in the side of the follower and a spring steel tab is welded into the groove. The tab gets pushed into the groove after the first round is loaded. The tab extends as soon as the last round is fired. The tab is tempered spring steel. The tab retracts very easy and does not hinder follower movement.


IMI 20rnd magazine in mag well adapter with bolt hold open raised.



Side view of magazine alone.



The bolt hold open clearance slot in the magazine needs to be lengthened a little and a tapered groove needs to be ground into the magazine to allow the bolt hold open tab to swing out.


Follower with tab