The CA M249 Box Magazine holds 2400 rounds and fits most side-feed M249 airsoft rifles. Classic Army's boxmag featueres a winding button on the bottomto wind the bbs into the SAW. This will fit both the CA and Echo1 M249 SAWs.
This battery powered boxmag winds easily by pressing the button, and will keep up with even high ROF setups when installed correctly.
CA M249 SAW Box Magazine Features:
-Fits CA and Echo1 M249
-Button Activated Auto Winding