not necessairly- it depends on the mag as well as the charger guide- i have both a us style and a cf charger guide and the cf would work with anyone's mag,provided you can fit it on the mag( it has guides both ends - the us, however, has to have indents in the mag for it to fit into and guides only the head- it's a scaled down version of the m14 stripper guide- but it seems kind of stupid , considering most( unless you have access to cf "stuff") stripper clips are 10 rounds and we're limited to 5- you can't cut the metal ones in half very well, and those stupid little tabs on the end will break sooner or later- i've got a barraks box full of them- the cf, ones, on the other hand are plastic and no problem to cut in half