boxmags, not the STAR's not TOP's, not MAG's not CA's can keep up just on boxmag motor with a saw with a fast enough rof. BUT - winding always to spring tension will put more strain on your boxmag as you walk around waiting for an engagement with it wound up. If you do maintenance on your boxmag pay attention to the windaxlewhere the spring attaches to the axle. Thats where it'll let loose first. (All the box mags are the same design on this). Its not a big deal if the spring comes unattached to the axle or even snaps there, just guide some more spring into the axle grooves - its alot like feeding weedwhacker wire). ----------------- Boxmags make great improvised bipods. Catridge pouches do not. ----------------- Spring guide - on the STARs when you use position 2 as its been called (basically shoving the spring guide into the box mag further so the catch catches on the springguide's back instead of its notch - btw you can do the very same thing on the CA and the PCG for the TOP, but there's no need to since they shoot the correct fps in the stoc position, heh - if you do do that, or even if you're in stock position... check to see if when you fold your rear stock up if it touches the spring guide. If not, you can stuff some clothe or such in there. Does a couple things - lowers the "Banging" of