So I bought a tuff22 mag and modified the receiver to accept it. I have found the little clips that go in the magazine a pain to use so I tried a modification on the BC magazine filler. Take about .096" off the filler as shown in the picture and the mag fits right in and works like a charm.
Hold the clip in place while you're filling the mag or it could be pushed out of the mag when you get full.
Edit: Using the HC3R mag I'm finding it doesn't like working well when full - 20 rds it seems to go really well, 25 not so much.
Hold the clip in place while you're filling the mag or it could be pushed out of the mag when you get full.

Edit: Using the HC3R mag I'm finding it doesn't like working well when full - 20 rds it seems to go really well, 25 not so much.
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