The distinction between regular and reinforced weapon mounts got me thinking. What kinds of weapons are larger than an LMG?
Sniper/Hunting Rifles are longer than an LMG but not wider or higher due to the much smaller magazine etc.
Anti Materiel Rifles probably are larger
A grenade launcher stated as pistol sized obviously should not be larger, and regular ones shouldn't either as long as you are talking about something like the M32 MGL and not a GMG.
ARs which come equipped with underbarrel grenade launchers should not be larger, but what happens to after market underbarrel grenade launchers? According to RAW they modify the weapon's concealability by a ridiculous +4. Are they now too large?