I use these in all my shotguns, they are well made, don't fall out and have the super nice spring loaded 'metal' primers which do what snap caps are supposed to do without wearing out, see link below.......
1.)..Don't like A-Zoom, they fall out and dent stock finishes etc., way too heavy, and the primer pockets are silicon and useless wearing out fast IMO.....(with a crater in them they are not doing any good).....
2.)..The clear plastic spring loaded are the worst, the rims snap off on a regular basis, junk.......
3.)..M&M black plastic are o.k., but the plastic primers wear out and crater rapidly IMO.........
If you want something that lasts year in and year out with a spring loaded primer that is metal:
https://www.grafs.com/retail/catalog/product/productId/12816
