“Ammo works great in my M9 and M&P Shield 2.0 - Both have new, standard size, factory made Mags. (not after markets). I mention this because a review is sometimes written and the accessories / items used to fire with were pretty vague or not mentioned and you wonder why the person was successful or unsuccessful with the product. My guns were cleaned / receivers lubed and ready to put rounds down range. (When my M9 is getting dry it will jam and double feed just about anything.) I do not own anything else, so i did not have a bad experience with this ammo. When i received the ammo, i kept it high and dry, in a Military grade, sealed, flight ready, ammo case. Hope this helps.”