More rounds more better!!! - Strike Industries Extended Magazine Plate for Glock 17/Glock 22

Using this EMP on ETS 17 9mm round magazine in a Ruger PC Carbine

Pros:
Adds weight to the bottom of the magazine to ease with releasing and doing quick mag reload drills
More surface to grab from pouch and/or from firearm
Adds additional rounds (+4 for me)
Easy to install spring and plate
Fits ETS magazines

Cons:
Does not add +6 rounds(for my ETS 17 9mm round magazine). Only able to +4 with headroom when inserting with a closed bolt.

I don't mind the +4 I achieved, can have +5 but don't like not having space when loading on an closed bolt. 21 better than 17