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| 9759501 | Breech assembly | Feb 23, 16 | Sep 12, 17 | The United States of America as represented by the Secretary of the Army |
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| 9702648 | Bolt action conversion kits and methods | Mar 07, 16 | Jul 11, 17 | Not available |
| 9658011 | Bolt carrier and bolt for gas operated firearms | Aug 27, 14 | May 23, 17 | LWRC INTERNATIONAL, LLC |
| 9435596 | Systems and methods for retaining an extractor pin in a bolt carrier group of a firearm | Nov 25, 15 | Sep 06, 16 | DANIEL DEFENSE, INC. |
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| 9200856 | Bolt assembly with improved rotating locking head | Feb 25, 14 | Dec 01, 15 | BENELLI ARMI S.P.A. |
| 8950097 | Automatic weapon magazine, charging handle, bolt carrier, bolt catch, scope, and bolt features and methods of operation | May 01, 13 | Feb 10, 15 | Not available |
| 8272312 | Breech for a repeating rifle and barrel for such a breech | Jun 08, 09 | Sep 25, 12 | Blaser Finanzholding GmbH |
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| 6564491 | Firearm bolt assembly | Jul 27, 01 | May 20, 03 | HECKLER & KOCH GMBH |
| 5886281 | Breech block control for firearm for projectiles | Nov 07, 97 | Mar 23, 99 | Bucher-Kirstein; Waltraud |
| 5398593 | Breech lock, especially for hand firearms | Nov 15, 93 | Mar 21, 95 | PSE PRODUKT-UND, PSE Produkt-und Systementwicklungsgesellschaft m.b.H., VOERE Kufsteiner Geratebau-und Handelsgesellschaft m.b.H., |