It kinda bothers me why only MOA and Fel-IX can penetrate targets. Sure those are analogues of 50 caliber rifles and have to do so, but yet i'm pretty sure analogues of 7.62 and 5.56/5.45 weapons should have some sort of similiar ability.
I suggest to extend the current weapon diversity with this. After bullet colides with an object, it loses some X % damage and starts the damage falloff for it which will reduce its damage to 0 after some Y meters.
*These stats are just an example
-MOA/Fel-IX: reduce damage by 20% and start a 20m falloff;
-PDP/Grandeur: reduce damage by 50% and start a 15m falloff;
-Stationary: -20% dmg & 20m FO;
-K-121/Minigun: -50% dmg & 15m FO;
-MK46: -60%dmg & 10m FO;
-Dreiss/SharC: -50% dmg & 15m FO;
-Timik: -60%dmg & 10m FO;
-M4/BR16/Stark/Hurtstall: -70%dmg & 10m FO;
-Crotzni: -60%dmg & 10m FO; (KEK that looks like a 9mm MP-5 seem to have a smiliar mag size as Crotzny so idk)
-Blish: -70%dmg & 5m FO;
-S&W/Simeon: -50%dmg & 5m FO
-DE: -60%dmg & 5m FO
-Caulden: -70%dmg & 5m FO;
-nothing to revifle, shitguns and 9mm SMGs/MPs/Pistols
This mechanic will make standing in line even more dangerous so holding a choke like tunnel will become easier; won't let escape behind a team mate and still cause some damage; hide somebody/something behind deployable ect.
Pretty sure it would be interesting to have some penetratable objects around the map to make use of spotting.
Also judging by recent "Ask the devs" they try different approaches to balancing weapons and this could be another one.