Firefly Mod Guide: Springs, Feed Systems & Shells
Choose a Firefly spring, shell-fed capacity or magazine conversion, then find the matching body and hardware parts.
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This is the largest of the sling-mounted shell holders, carrying 4 shells at once for players who would rather load up their sling than keep reaching for a separate ammo pouch. It mounts the same way as the smaller 2 and 3-shell versions, clipped onto a sling or bandolier up to 38mm wide, which covers straps like the MS2 and MS3, and the back is printed in TPU for a flexible, comfortable hold against the strap.
Since each holder is a separate unit, you are not locked into 4 shells either; pick up more of any size to build out exactly the capacity you want across your sling. Available in black, orange, and white, other colours by request, and it comes with both 8mm and 10mm screws so it fits thinner and thicker slings alike.