The Grot CH-9/25 was a submachine gun of Rhodesian origin. The receiver is a round section sealed with the back by a screwed stopper. The gun is contained on half its length in this carcass. The part before tube comprises perforations acting as cooler. The ATS arming lever is placed at before left, it is directed with 45° upwards. The mobile cylinder head is cylindrical, it is equipped with groove which allows a correct operation even very clogged. The springs recuperators are two, they have their own stem-guide. The pistol grip contains the mechanism of relaxation which comprises a relaxation with double basin allowing the shooting blow by blow or gusts. The pistol grip comes with a safety grip. The stock is wire folding with the lower section of the weapon in position of transport, the shoulder plate integrates into the forward pistol grip. The bodies of aiming are consisted a protected handlebar and an eyepiece which acts as bolt for the back stopper. Two base plates welded onto the top section of the receiver allow the installation of a sight tube or a Single Point infra-red sight.