Virtual Arsenal does not save secondary muzzle (e.g. grenade launcher) magazines.
The format of bis_fnc_saveInventory_data does not appear to support this. Either a primary muzzle magazine is saved or the secondary muzzle magazine is saved. Both cannot be saved.
This causes loadouts using primary weapons with underbarrel attachments (e.g. grenade launchers, shotguns) to load without a magazine loaded. This is frustrating to players that create grenadier loadouts as they typically assume their grenade launcher is loaded and may attempt to use the grenade launcher in combat, only to find it is unloaded.