I've been researching endlessly for parts and information on box mags for the CA m249. It seems all the box mags that are released for the CA, top, star have feeding issues. the main problem i have read were, increasing the ROF the box mags can't catch up. People on ASCK have been wiring it to their triggers only to have their box mag's motor fry.
there was a guy on ASCK who did his own cutom work, which i'll try to do for myself i just cant seem to find custom cloth pouches, oh yea here it is
it looks similar to the MAG 2500rd box mag, but its actually a modified CA box mag, with a pouch.
anyone know where i can find this... gotta get start on my box frame