I use Mec-Gar parts whenever possible because they work great. The price is not inflated like some custom shop brands, the quality is consistently high, and function is flawless. Buying just the tube lets you save a few bucks when your plan is to use an extended capacity floorplate and new internals.

These work great with my Shadow 2. I'm able to get 18 rounds with the grams kit and they engage and drop the same as the CZ factory 16 round mags.