I also see lots of people are using +P ammo which as stated isn't recommended in the manual but doubt it would hurt the gun at all. +P+ ammo is a no no though and a steady diet of +P might make your shield ready to S&W for a tune-up earlier than not using +P. I don't us any +P ammo either and find standard Federal LE 124gr HST are all I need in a SD ammo.

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44 Garrett Defender Ammo 4 me.