PCT No. PCT/NL94/00276 Sec. 371 Date May 6, 1996 Sec. 102(e) Date May 6, 1996 PCT Filed Nov. 7, 1994 PCT Pub. No. WO95/13513 PCT Pub. Date May 18, 1995A modular concept for a gun which uses a breech conversion kit allows the firing of cased and caseless ammunition with the same gun. The cannon has 2 breech mechanism (10) which includes a first sliding breech-block (19) which engages the rear end (15) of a cartridge case in the firing position. Said first sliding breech-block (19) is interchanged for a second sliding breech-block (21) when firing caseless ammunition. Said second breech-block is in contact with a scaling member (23) which is mounted pivotally on an axis (27) which is located on the upper face of breech ring (11).
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