Lever Action Rifle Bolt Stop

Early Smokless Powder Rifles

SI G .22} Model 530-1 Rifle with folding butt stock.

FORMER MILITARY RIFLES: 7.5mm Schmidt Rubin M1889, M1889/1900, M1896/11, and M1911 rifles. Carbines: 7.5mm Mi893 Mannlicher, M1905, and M1911 Schmidt Rubin.

Description of the Schmidt-Rubin Rifles

Major, later Lieut. Col. Rubin, then director of the Swiss Laboratory at Thun, was among the first to recognize the tremendous potentialities of the small bore high velocity military cartridge. As early as 1883, he submitted his 7.5mm cartridge to the Swiss Government. He introduced the then novel idea of using a lead bullet core completely enclosed in a copper jacket. Smokeless powder had not appeared at that time, but Rubin presented a load consisting in large part of a compressed black powder which was surprisingly clTective. With the introduction of smokeless powder in 1886, Rubin intensified his development of his 7.5mm cartridge. The boat-tailed bullet design introduced in the Mydel 11 cartridge nearly doubled the effective range of the military bullet.

Meanwhile, Col. Rudolf Schmidt, one of the most scientific arms researchers and writers of all time, had made a complete survey of every type of rifle design then in existence. According to his own contemporaneous works, he was responsible for the rifle design basically, while Rubin was responsible for the cartridge and ballistic designs of the new rifle which the Swiss oliicially adopted in 1889.

Model 1911, Caliber 7.5mm

The first model of this rifle introduced in 1889, and long since obsolete, had a magazine capacity of 12 cartridges loaded from two clips. All later patterns hold 6 cartridges.

The early designs have the following characteristics:

The receiver is exceptionally long because of the straight pull action employed. At rear it comprises a complete cylinder form of bridge behind the magazine well. The length of this bridge is about 4.25 inches.

The receiver forging is bored with a second complete cylinder on the right rear, leading into the larger one. The point of the bolt stop, which prevents the bolt mechanism from being jerked out of the rifle as it is drawn to the rear, passes through a cut in the bottom of the smaller cylinder.

The larger cylinder is also provided with a bottom cut to receive the stud of the striker. The sear nose passes through a vertical cut in the bottom of this striker stud cut.

Longitudinal grooves are provided on the inside of the main receiver cylinder as travel guides for the two bolt lugs.

A diagonal groove extends from each longitudinal travel groove into the re cesses in the receiver for the lugs. These lug seats are cut on a screw pitch. The locking is to the rear of the magazine. The lugs are not carried on the bolt itself in customary fashion but on a bolt sleeve. The rear section of the receiver forms the customary tang for attachment to the stock.

The barrel is heavily reinforced at the point of screwing into the receiver. Diameter is reduced in two successive steps forward of the chamber and then tapers to the muzzle, a slight swelling being allowed at the point of mounting of a barrel sleeve which carries the sight ring. This barrel sleeve is not found on any other rifle. It is a copper alloy tube fitting around the reinforce in the barrel which is gripped between the fore-end and the handguard.

The bolt assembly is a complex unit consisting of (1) a long bolt cylinder; (2) a removable locking sleeve which fits over the rear half of the bolt cylinder and carries the locking lugs; (3) a bolt cap mounted over the rear of the assembly and designed to be operated by a side rod to which a handle is attached; and (4) the striker and safety mechanism.

The bolt cylinder proper is bored out through its entire length. The striker and the mainspring are inserted from the rear. The right side of the bolt cylinder has a cut to permit the stud of the operating rod to enter. Almost at its center a circular flange is machined which forms the forward bearing lor the locking sleeve when it is in place. The cylinder is grooved on either side forward of this flange to permit it to travel through the folded-in edges of the magazine on forward and rearward stroke.

The bolt cylinder is cut with a groove on the left for the ejector; and on top to the right it has a fiat to receive the extractor.

The bolt face is also a separate piece in this design, but is screwed in and permanently attached, ft. gives the general affect of a solid bolt head. The bolt head is recessed to completely enclose the head of the cartridge case.

The locking sleeve, which carries the lugs, is mounted loosely behind the flange 011 the bolt cylinder. The dual lugs are at the forward end of this sleeve on the M1911 rifle, the M1896/11 rifle, and the M1911 carbine. The Mi889 rifle, Mi889/96 rifle, M97 cadet rifle, and MS9/00 short rifle have their locking lugs mounted toward the rear of the locking sleeve. The upper lug is somewhat ahead of the lower one. The front and rear faces of both lugs are cut to a screw pitch. A helical cut runs along part of the sleeve wall to rcccivc the stud at the end of the operating rod, which works in this helical cut.

The bolt cap screws to the rear end of the bolt cylinder after the sleeve is mounted. It is bored for the striker to pass through it. The mainspring rear bears against an inner shoulder on this bolt cap. There is a broad flange at the rear of the cap having a clearance for the operating rod. A slot is also provided in the cap for the cocking stud of the striker. The safety slot for the striker stud is at right angles to this stud slot.

A rib with an undercut groove is provided in the right side of the cap to receive the stud on the operating rod. The forward end of the cap seats against the locking sleeve to provide a bearing.

The operating rod itself travels in the secondary cylinder in the receiver. It has a lever at its rear to serve as a hand piece, drawing knobs being provided on both sides of the lever. A groove on the underside of the rod receives the point of the bolt stop. Two projections arc provided in this groove. The bolt stop

Modern RiflesRifle Design Bolt Drawing

Model 1911 Swiss Swire Mftc holt. The upper picture shows details of the operating system. Note that this design uses a two piece firing pin. The ring on the rear of the striker assembly permits cocking the rifle without opening the action. When this ring is bulled back and turned, it withdraws the striker from sear contact and locks il against accidental discharge.

The lower picture shows detail of holt assembly and independent view of the operating handle. The assembly is shown in rear position The operating rod can travel only in a straight line in its own receiver groove. As it moves forward it works against the cam cut in the bolt compelling the bolt to turn into locking engagement. The lugs lock to the rear of the magazine well in their receiver seats. (Note- RoU construction differs slightly in earlier designs.)

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