Ordnance – Automatic – Breech block lock
Patent
1999-02-04
2000-04-04
Johnson, Stephen M.
Ordnance
Automatic
Breech block lock
89188, 42 18, 42 22, 42 25, 29 11, F41A 326
Patent
active
060447486
ABSTRACT:
Reliability of a multi-lug breech bolt is improved by modifying the bearing relationship between the bolt lugs and the matching lugs within a gun receiver. This procedure is applied to a gun that has a receiver housing a breech bolt and an extractor. The extractor is coupled to the breech bolt and configured to move relative thereto. The bolt for this gun has at least five radially extending bolt lugs configured for bearing contact with the receiver when positioned for firing. The bolt lugs include a first, second, and third bolt lug with the first and second bolt lugs being adjacent and defining a gap configured to receive the extractor therebetween. The third bolt lug extends from the bolt opposite the gap. Stress imparted to the first and second bolt lugs from firing the gun is reduced by altering the gun to prevent formation of a bearing relationship between the third bolt lug and the receiver when the bolt lugs are positioned for firing. The gun is reassembled as part of the procedure. The alteration may be accomplished by removing material from the third lug, a corresponding lug of the receiver, or both.
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Armalite Inc.
Johnson Stephen M.
LandOfFree
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