Odin Innovations M12 Sidewinder speed Loader Internal Buffer (Sound Dampener)
High-quality silicon rubber Construction
This ultra-thin sleeve significantly dampen the rattling noise typically associated with hard-plastic containers (think high-cap mags)
Top it off you only loose roughly 15% of the loader's carrying capacity
That's a pretty good trade-off for the times when you need to carry extra ammo in the field while maintain your stealth-kill ratio