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  • F41A21/00
    		•  Barrels; Gun tubes; Muzzle attachments; Barrel mounting means (F41A 25/00 takes precedence; barrel attachments for firing grenades or riot-control ammunition from smallarms F41C 27/06; sighting devices F41G 1/00) [5] HB CC 2C014
  • F41A21/02
    		•  .Composite barrels, i.e. barrels having multiple layers, e.g. of different materials [5] HB CC 2C014
  • F41A21/04
    		•  ..Barrel liners [5] HB CC 2C014
  • F41A21/06
    		•  .Plural barrels [5] HB CC 2C014
  • F41A21/08
    		•  ..Barrel junctions [5] HB CC 2C014
  • F41A21/10
    		•  .Insert barrels, i.e. barrels for firing reduced calibre ammunition and being mounted within the normal barrels [5] HB CC 2C014
  • F41A21/12
    		•  .Cartridge chambers; Chamber liners (F41A 3/74, F41A 9/46, F41A 21/04 take precedence) [5] HB CC 2C014
  • F41A21/14
    		•  ..Arrangement of cartridge chambers lateral to the barrel axis [5] HB CC 2C014
  • F41A21/16
    		•  .Barrels or gun tubes characterised by the shape of the bore [5] HB CC 2C014
  • F41A21/18
    		•  ..Grooves; Rifling [5] HB CC 2C014
  • F41A21/20
    		•  .Barrels or gun tubes characterised by the material (F41A 21/02 takes precedence) [5] HB CC 2C014
  • F41A21/22
    		•  .Barrels which have undergone surface treatment, e.g. phosphating [5] HB CC 2C014
  • F41A21/24
    		•  .Barrels or gun tubes with fins or ribs, e.g. for cooling [5] HB CC 2C014
  • F41A21/26
    		•  .specially adapted for recoil reinforcement, e.g. for training purposes [5] HB CC 2C014
  • F41A21/28
    		•  .Gas-expansion chambers; Barrels provided with gas-relieving ports (F41A 1/06, F41A 13/08 take precedence) [5] HB CC 2C014
  • F41A21/30
    		•  .Silencers [5] HB CC 2C014
  • F41A21/32
    		•  .Muzzle attachments or glands (F41A 21/26, F41A 21/30, F41A 21/46 take precedence) [5] HB CC 2C014
  • F41A21/34
    		•  ..Flash dampers [5] HB CC 2C014
  • F41A21/36
    		•  ..for recoil reduction (recoil reduction arrangements in general F41A 25/00) [5] HB CC 2C014
  • F41A21/38
    		•  ...adjustable [5] HB CC 2C014
  • F41A21/40
    		•  ..Chokes for shotguns [5] HB CC 2C014
  • F41A21/42
    		•  ...adjustable [5] HB CC 2C014
  • F41A21/44
    		•  .Insulation jackets; Protective jackets [5] HB CC 2C014
  • F41A21/46
    		•  .Barrels having means for separating sabots from projectiles [5] HB CC 2C014
  • F41A21/48
    		•  .Barrel mounting means, e.g. releasable mountings for replaceable barrels [5] HB CC 2C014
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