9mm AR question

[Prince Yamato]

Well, I took the plunge and bought a 9mm RRA AR-15. It has the Hahn removable adapter in the magwell. This got me thinking. Could I purchase Hahn's Sten Mag adapter and use it with the Colt pattern upper? I have like 20 sten mags sitting around my apartment.

 

[JDGray]

Congrats on the new AR! Mine runs like a swiss watch on modded uzi mags, may ask over on AR15.com on the sten mags.

 

[wally]

I don't see why not if the Sten adapter doesn't require changes to the mag well.

My RRA 9mm has the 9mm adapter pined in with a roll pin. Both the C-products and ProMag 32 round mags have worked great for me and lock the bolt back on the last shot. Although I had to remove some molding "flash" from the front of the ProMags to make them work and the black follower C-Products mags need some filing on the followers to get them to come up enough to lock back. The orange follower C-Products mags showed me what I had to do.

The modified Uzi mag that came with mine has been less than 100% reliable and doesn't lock the bolt back.

The only "fine print" I can think of is Sten mags are double column single feed while the Uzi mags are double column double feed so you 'd need to verify the RRA bolt can clear the feed lips of the Sten mags when in feeding position.

--wally.