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The Remington 870 was the fourth major design in a series of Remington pump shotguns. John Pedersen designed the fragile Remington Model 10 (and later the improved Remington Model 29). John Browning designed the Remington Model 17 (which was later adapted by Ithaca into the Ithaca 37 ), which served as the basis for the Remington 31 .
Individual soldiers were often forced to carry a breaching shotgun in addition to their standard-issue rifle, but the Masterkey removes this need. The system consists of a shortened Remington 870 12 gauge pump-action intended to be mounted under a firearm's barrel, similarly to the M203 grenade launcher. It has a 3-round internal tubular ...
[4] [5] [6] The defining difference between clips and magazines is the presence of a feed mechanism in a magazine, typically a spring-loaded follower, which a clip lacks. A magazine has four parts as follows: a spring, a spring follower, a body and a base. A clip may be made of one continuous piece of stamped metal and have no moving parts.
Magpul created a larger variation of their PMAG magazine, called the "Black Widow," with a blood-red follower for the 6.8mm round. The upper and lower receivers were developed specifically to fit this Magpul magazine and optimized around the 6.8×43mm round. The flagship model of the Six8 series is the UCIW which features an 8.5-inch barrel.
The rifle is built with JP-made components including a left-side charging handle receiver and trigger group but is sold and supported by Remington. Remington offers the R11 RSASS rifle as a complete package, with a Leupold telescopic sight, a quick-detachable suppressor, a Harris bipod and a carrying case. [2]
The Remington Model 31 is a pump-action shotgun that competed with the Winchester Model 1912 for the American sporting arms market. [1] Produced from 1931 to 1949, it superseded the John Pedersen-designed Models 10 and 29, and the John Browning-designed Model 17. It was replaced by the less expensive to manufacture Model 870 in 1950. [2]
The upper arm is usually shorter to induce negative camber as the suspension jounces (rises), and often this arrangement is titled an "SLA" or "short, long arms" suspension. When the vehicle is in a turn, body roll results in positive camber gain on the lightly loaded inside wheel, while the heavily loaded outer wheel gains negative camber.
A simple displacement diagram illustrates the follower motion at a constant velocity rise followed by a similar return with a dwell in between as depicted in figure 2. [4] The rise is the motion of the follower away from the cam center, dwell is the motion where the follower is at rest, and return is the motion of the follower toward the cam ...
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