Merkel manufactures two special threeshot guns as uni-type drillings. Here an extra quick single trigger system comes into operation. The front trigger serves as a single trigger for the two upper rifle barrels of the rifle drilling or the two upper shotgun barrels of the shotgun drilling. This enables a rapid second shot without the need to change grip. The rear trigger is reserved for the lower rifle barrel of the rifle drilling or the lower shotgun barrel of the shotgun drilling. The 961LS versions are fitted with long side plates.