Been using the original MagGuts in my factory Shield mags since they came out several years ago (2015). They've been flawless. I put several hundred Mags worth of rounds through them before trusting them for carry though.
I also have a couple mags with the newer Z-Spring and they work well too.
I didn't get them just because they added 1 more round. I use them because they allow me to easily load all seven rounds (in the flush mag) and allow the mag to lock in with a gently push, rather than needing to 'slam it home'.
Do a forum search of MagGuts and my user name and you will find the original threads.
Edited to add: Here it is... M&P shield owners, check it out
I also have a couple mags with the newer Z-Spring and they work well too.
I didn't get them just because they added 1 more round. I use them because they allow me to easily load all seven rounds (in the flush mag) and allow the mag to lock in with a gently push, rather than needing to 'slam it home'.
Do a forum search of MagGuts and my user name and you will find the original threads.
Edited to add: Here it is... M&P shield owners, check it out
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