US 12,460,886 B2
Reducing blow-by in firearms
Frederick H. Kart, Shallotte, NC (US)
Filed by Frederick H. Kart, Shallotte, NC (US)
Filed on Feb. 16, 2024, as Appl. No. 18/444,140.
Application 18/444,140 is a continuation of application No. 18/049,813, filed on Oct. 26, 2022, granted, now 11,933,565.
Application 18/049,813 is a continuation of application No. 17/496,340, filed on Oct. 7, 2021, granted, now 11,493,296, issued on Nov. 8, 2022.
Prior Publication US 2024/0247900 A1, Jul. 25, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F41A 21/18 (2006.01)
CPC F41A 21/18 (2013.01) 13 Claims
OG exemplary drawing
 
1. A method of preventing blow-by 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 from exiting the barrel in advance of the bullet via the reduced width component,
wherein the firearm barrel includes a 0.125 inch throat, a 0.030 inch space from the chamber end of the barrel to the lands; 0.200 inch between lands at a distance of 0.125 inch from the end of the chamber, a land width of 0.040 at 0.125 inch from the end of the chamber and a groove width of 0.200 inch at 0.125 inch from the end of the chamber.