When trying to ready the weapon or aiming down sights while close to either metal railings at the ATC building or radar dish and the slightly taller ledges atop the oil tanks (I noticed this at the NWAF structures but assume that it affects those structures in general) long guns behave strange: they cant be aimed/brought into the ready stance even when aimed through the gaps and in case of the oil tanks weapons clip into the ledge instead of resting on top of them so you dont always have muzzle clearance.

Therefore I assume the weapons collision system might be to sensitive and does not check the position of the weapon in relation to the structure properly.