| 1924 JULES Equilibrated Breech Block Patent |
| 1921 CHARLES Breech Block Mechanism Patent Print |
| 1964 JARVIS Breech Block Locking Bolt A Gun Art |
| 1953 RUGER Breech Block Firing Pin Assembly Small Arms |
| 1952 MAY Breech Block Firing Mechanism Therein |
| 1958 RAY Rockable Breech Bolt Locking Block Art |
| 1931 MCCANN Breech Block Operating Mechanism Art |
| 1960 HOYT Firearm With Breech Block Retarding Means |
| 1963 BOUDREAU Pistol With Slidable Fixed Breech Block |
| 1952 BORJE Pivoted Breech Block Locking Mechanism |
| 1955 GILDO MARCATI Breech Block Firearms Art |
| 1960 REX Breech Block With Quadruple Thread Art |
| 1946 WILLIAM Breech Block Mechanism Patent Print |
| 1955 ANTONIO Breech Block For Firearms Patent |
| 1949 MOLINS MACHINE LTD Automatic Breech Block |
| 1930 EMILIEN Combined Projectile Breech Block Ordnance |
| 1952 BOFORS AB Pivoted Breech Block Locking Mechanism |
| 1949 FREDERIC Automatic Breech Block Patent |
| 1957 BOFORS AB Breech Block For A Gun Patent |
| 1957 JOSEPH Breech Block Return Means Patent |
| 1957 BERTIL Breech Block For A Gun Patent Print |
| 1958 STERN Breech Block Mechanism Patent Print |
| 1916 GODDARD Rocket Casing Breech Block Patent 22351 |
| 1957 ARMES DE GUERRE FAB NAT Breech Block Return Means |
| 1956 BERNARD Breech Block Locking Means Patent |
| 1892 ARCHBOLD Machine Gun Breech Block Patent 22260 |
| 1964 OLIN MATHIESON Breech Block Locking Bolt A Gun |
| 1959 RUDOLF Locking Members A Composite Breech Block |
| 1956 KUPER Breech Block Removing Tool Patent |
| 1960 LAZARE Firearm With Rearward Swinging Breech Block |
| 1958 LORD JOHN Split Breech Block Patent Print |
| A Breech Block Split Pin for the.577/ Martini Action |
| US SPRINGFIELD TRAPDOOR RIFLE PARTS BREECH BLOCK PIN |