i've got 4 springfield made 5 round mags ( originals, made for parade use-) "acquired "and they are real b#tches as well- you need a screwdriver to "encourage" them to eject- i used to use them ro prevent arguments with c/os and leos re having over capacity mags- 5 rounds for hunting only- well it was just a whole lot easier to show him the shorty mag rather than having him check by having me unload the mag and then show him it would only take 5- the more savvy ones carried a "depth stick" - ie you could depress the follower to a certain depth- but it didn't work for double stack mags- i had to do the unload and prove thing more than once