CowCow Technology CNC Aluminum Dot Matrix Magazine Base Plate for TM Hi-Capa Pistols
(Color: Red)

"Pick up one of these for 4.3 build. very durable and adds a nice weight to the mag allowing easy mag changes. mag releases extremely positive. Of course I had to test the base plates gimmick, which is that pin at the back. Very durable and the plate didn't fly off when I did my drop tests. Got to them for the rest of my mags

Pros
-very durable
-great color( I got red)
-great counter weight for recoil
-helps mag changes
-easy install and removal
- no filling issues

Cons
-little expensive
-adds weight to mags