Many hunters, particularly those with mixed small game and in mountainous hunting areas, want to be able to carry a single firearm with two different calibers. The upper, smaller barrel of the BS95 or BS97 lies in a carrier tube and can be adjusted precisely to the bottom barrel.

Combination guns from the 95 model series are fitted with a single-lock and combined guns from the 97 model series with double-locks. This means that there are two strikers and two ring pin springs in the system. Both systems have their benefits.

The advantage of the 95 system is the slightly simpler operation, as only one ring pin spring needs to be cocked. This means that the rearm is automatically decocked after a single shot has been red and the safety is engaged.

The advantage of the 97 system is that when a second shot is required, it can be released very quickly without having to be recocked. The 97 system is particularly useful for hunters who frequently have the opportunity of ring a second shot quickly.