A Bottle Suppressor is very, very strong. Being able to snipe at players without the immediate danger of being heard, spotted and sniped back at, is one of the strongest PVP advantages you can get.
Bottle Suppressors are right now OP, because they are
a) too easy to acquire and
b) they are too durable.
The KamraKrew servers in my opinion have found the optimal balance for them, they changed the following:
a) You need a full 100% Tape to craft a bottle suppressor
b) the durability is so low, that almost all calibres ruin it in one shot.
So you got one shot and you need to make it count! That is reasonable for balance and gameplay reasons. The state right now is OP. If you spot someone first and you have one Bottle Suppressor and you have solid aim, the other guy has little chance.