Identifier: reportofboardof00unit (find matches)
Title: Report of the Board of officers appointed in pursuance of the act of Congress approved June 6, 1872, for the purpose of selecting a breech-system for the muskets and carbines of the military service, together with their report upon the subject of trowel-bayonets;
Year: 1873 (1870s)
Authors: United States. Board on Breech-loading Small-arms United States. Army. Ordnance Dept
Subjects: United States. Army Firearms Bayonets
Publisher: Washington, Govt. Print. Off.
Contributing Library: Library of the Marine Corps
Digitizing Sponsor: Library of the Marine Corps

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he point of the extractor engages with a recess in aring which surrounds the mouth of the chamber, and against which thebolt is pressed, and turns the ring with it; so that the rotation of thebolt in locking will not cause it to grind against the head of the car-tridge. Locked.—In turning down the handle the piece is locked by the en-gaging of a sectional collar on the bolt with a corresponding groove inthe receiver. When this is accomplished the lug on the firing-pin isopposite the deepest part of the spiral recess and is free to move for-ward when the piece is fired. Fired.—By a center-lock moved by a double mainspring. Extraction.—By a spring-hook lying on top of the breech-bolt. Ejection.—In drawing back the bolt, the natural spring of the extractorpresses down the rim of the cartridge upon the bottom of the receiver,until it is checked by striking against a notch left there for that purpose,and is thereby thrown upward around the hook of the extractor andclear of the gun.
Text Appearing After Image:
I I ?l T 27 PARTSOne o/ TTood :1 Stock. Ten principal metallic partsnot otherwise mentioned: PECULIAR AND ESSENTIAL TO THE SYSTEM. Firing Pin Stop,Firing Pin. Eleven Screws: Guard Bow Nut,Guard Bow Nut,Trigger Screw,Hammer Screw,Guard Screw, UpperGuard Screw, LowerRecoil Screw,Tang Screw,Breech Bolt Stop Screw, 18 Chamber Ring, 19 Guard Plate, 23 Guard How, 25 Trigger, 26 Hammer, •» Tang, 30 Breech Bolt, 32 Receiver, 36 21 PARTS NOT PECULIAR TO THE SYSTEM, OR COMMON TO ALL ARMS. 39 Spring Extractor Screw, 40 Breech Bolt Locking Scr. Three Swings:33 Main Spring,38 Spring Extractor,47 Barrel Chamber Ring Spr.Two other minor parts :Upper Guard ScrAV Thim-ble, Lower Guard Scrw Thim-ble. 27 :..» Tip, Tip Screw, Butt Plate, Butt Plate Screw, Butt Plate Screw, Ramrod, Ramrod Stop, 0 Lower Band, 111 Lower Hand Swivel, 11 Lower Hand Screw, 12 Upper Hand, 13 Upper Hand Spring, 14 Barrel and Front Sight,;>0 Guard How Swivel, 21 Guard Bow Swivel Scr., 42 Rear Sight Base, 43 Rear Sight Base

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