BUR #60004 is pending approval.
create alias gun_sling -> weapon_strap
The problem is, the identical-looking, similar type of sling is also seen attached to non-firearm weapons like rocket launchers (post #10862377).
Weapon strap has been used on rifles (post #11340574).
Also, the wiki for holding_strap indicates its usage for the act of holding any strap of an object. So I won't consider holding gun applies on post #11421578.
Updated by World Funeral