The Mosinâ€“Nagant is a bolt-action, internal magazine-fed, military rifle, developed by the Imperial Russian Army in 1882â€“1891, and used by the armed forces of the Russian Empire, the Soviet Union and various other nations.
The Mosin has a commonality with Mauser rifles, in that it uses two front locking lugs to lock up the action. However, the lugs lock in the horizontal position, whereas the Mauser locks vertically. The Mosin bolt assembly is multi-piece instead of unitary, like the Mauser, and uses interchangeable bolt-heads like the Lee-Enfield. Unlike the Mauser, which uses a so-called "controlled feed" bolt head, the Nagant has a recessed head for the cartridge base, what modern terminology calls a "push feed". While modern push-feeds use a plunger ejector in the bolt face, the Mosin uses a blade ejector in the receiver, similar to the Mausers. Also, the extractor is spring-loaded; unlike the fixed Mauser. The bolt is removed by simply pulling it fully to the rear of the receiver and squeezing the trigger from there.
Like the Mauser, the bolt lift arc on the Mosinâ€“Nagant is 91 degrees, versus 60 degrees on the Lee-Enfield. The location of its bolt handle is an unusual feature of the Mosinâ€“Nagant, protruding out of the ejection/loading port rather than connecting to the bolt in the rear. Furthermore, the handle is attached to a protrusion on the bolt, which houses the firing pin and serves a similar function to Mauser's "third" or "safety" lug.
The rifling is right turning (clockwise looking down the rifle) 4-groove with a twist of 1:9.5" or 1:10".
Weight: 3.4kg (7.5 lb)
Length: 1,013mm (39.9 in)
Barrel length: 514mm (20.2 in)
Cartridge: 7.62Ă—54mmR, 7.62Ă—53mmR (Finnish variants only), 7.92Ă—57mm Mauser (Polish variants)
Muzzle velocity: 800m/s (2,625 ft/s) carbine.
Effective range: 500m (550 yards), 800+ m (731+ yards with optics)
Feed system: 5-round non-detachable magazine, loaded individually or with five-round stripper clips.
Rear: ladder, graduated from 100m to 2,000m
Front: hooded fixed post (drift adjustable) PU 3.5 and PEM scope also mounted