Patent ID: 11933565
Assignee: nan
Field: Other special machines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 14:
15. A method of reducing erosion and abrasion in a firearm comprising the steps of:
providing a firearm barrel having a longitudinal axis, including rifling formed of an alternating, spirally-extending plurality of grooves and lands defining a twist angle adapted for imparting rotation to a bullet being impelled through the barrel from a chamber end and exiting a muzzle end;
forming in each of the plurality of lands a reduced width component communicating with the chamber end of the barrel for a predetermined distance towards the muzzle end of the barrel, wherein the reduced width component defines an acute angle in relation to the longitudinal axis of the barrel; and
preventing blow-by gasses comprising at least one of unburned powder and ash from preceding the bullet along the barrel via the reduced width component thereby minimizing erosion and abrasion in the barrel,
wherein the reduced width component of the lands provides a 5 to 1 groove to land ratio.