The issue is only with the VFC SCAR-H and SSR models. The rest use fairly standard magazine types (though being airsoft, fitment will be case-by-case).
Regarding the piston, it's polycarbonate. Assuming you downgrade your spring, it should last a long while, but with the upgraded spring in (for import purposes), it'll strip eventually.
VFC SCAR-L - VFC SCAR SSR - KJW Hi-Capa 5.1 - CAW M79
The Three Sisters - WE G39 E/K/C
Originally Posted by kalnaren
Stalker stays where he is.
His BB's fly across the country to hit their target.