Barrels; Gun tubes; Muzzle attachments; Barrel mounting means (F41A25/00 takes precedence; barrel attachments for firing grenades or riot-control ammunition from smallarms F41C27/06)

Child Classifications

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• F41A 21/02 Composite barrels, i.e. barrels having multiple layers, e.g. of different materials
• F41A 21/06 Plural barrels
• F41A 21/10 Insert barrels, i.e. barrels for firing reduced calibre ammunition and being mounted within the normal barrels
• F41A 21/12 Cartridge chambers; Chamber liners (F41A3/74, F41A9/46, F41A21/04 take precedence)
• F41A 21/16 Barrels or gun tubes characterised by the shape of the bore
• F41A 21/20 Barrels or gun tubes characterised by the material (F41A21/02 takes precedence)
• F41A 21/22 Barrels which have undergone surface treatment, e.g. phosphating
• F41A 21/24 Barrels or gun tubes with fins or ribs, e.g. for cooling (F41G1/42 takes precedence)
• F41A 21/26 specially adapted for recoil reinforcement, e.g. for training purposes
• F41A 21/28 Gas-expansion chambers; Barrels provided with gas-relieving ports (F41A1/06, F41A13/08 take precedence)
• F41A 21/30 Silencers
• F41A 21/32 Muzzle attachments or glands (F41A21/26, F41A21/30, F41A21/46 take precedence )
• F41A 21/44 Insulation jackets; Protective jackets
• F41A 21/46 Barrels having means for separating sabots from projectiles
• F41A 21/48 Barrel mounting means, e.g. releasable mountings for replaceable barrels