I did the same but just used JB weld to secure the AL piece. I also spread the Aluminum channel to snugly fit the magazine shell. I've come up with an idea to move the mag spring back so it sets agains the new back "wall".

IF ANYONE NEEDS ALUMINUM I HAVE A BUNCH OF IT.

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Last edited by Iclimb; 04/15/15.
If at first you don't succeed; shoot, shoot again