Why would anyone want to pick up a G43? It doesn't come with Slow.
Which is why dropped BARs are pathetic. Picking up a bren or lmg grants suppression, but BARs use an ability so it doesn't transfer.
BTW, either none or [practically] all specials should be available in buildings/halftracks. Personally button should not be allowed in garrison since there's no timely counter to a garrisoned squad. Vehicles can be destroyed but buildings take time. Same with slow, it is not allowed in buildings because it would be very hard to break it. Maybe fausts and stickies could work in garrison, but definitely not the gimmicks.