I can see a general chameleon sheath for weapons, probably in three versions. A short version for small arms, a medium version for medium arms, and a long version for large arms.
Chameleon Weapon Sheath:
The sheath consists of a soft tube of chameleon ballistic fabric narrow at the barrel end and wider through the rest, allowing easy covered access to the grip and trigger through hand holes with sleeves covering past the wrist. A bag on the bottom allows collection of spent casings with multiple access seals for magazine changing. A single magazine may also be carried and changed entirely within the cover if the sheath is large enough for an accessory and none are mounted. A cover on the top of the long versions allow for adding advanced sighting aids.
The user plugs the sheath into the chameleon armor worn through a wrist connection which provides the power and display driver. It is not very effective alone but offers some benefit in general protection and muffling of the weapon signature.
Available in three general sizes each sheath also serves as a sturdy carry case and can be sealed against the environment.
TL12 models (compatible with TL12 Chameleon Armor):
Short Sheath - Cr100 wt. 0.1kg
Suitable for small arms including handguns with an added shoulder stock or silencer and smgs or carbines with a folded stock.
Medium Sheath - Cr300 wt. 0.3kg
Suitable for medium arms without accessories and including handguns with an added shoulder stock and silencer, and smgs or carbines with a full stock.
Long Sheath - Cr500 wt. 0.5kg
Suitable for large arms and including medium arms with accessories such as grenade launchers, suppressers and advanced sights.
TL14 models (compatible with TL14 Chameleon Armor):
Identical to the above except the prices are 5x those shown.
Psionic Shielding may be added to any of the above for Cr400 to prevent psionic tampering with the weapon.