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The New Haven 600 is identical to the Mossberg 500 from O.F. Mossberg & Sons, with the addition of an anti-rattle system in the magazine tube, and the top of the receiver is not drilled out of a scope mount. Many of the 600AT models came with adjustable C-Lect Chokes.
In 1971, it was offered with the option of the Winchoke screw in choke tube system, supplied with a set of three tubes in improved cylinder (IC), modified (M) and full (F) choke. [15] [f] In 1973, 16-gauge was dropped from the production line. [15] With introduction of the Model 1300, a 3-inch (76 mm) chamber was made standard. [20]
The Stoeger Coach Gun has been produced in 12 gauge. The chambers are three inches long, to accommodate either 2¾ inch or 3 inch shells. Barrel lengths include 18, 20 and 24 inch. The gun has a raised center rib with a brass bead front sight. The Coach Gun has dual triggers, one for each barrel.
A 12-gauge shotgun, nominally 18.5 mm (0.73 in), can range from a tight 18 mm (0.71 in) to an extreme overbore of 20 mm (0.79 in). Some also claim an increased velocity with the overbored barrels, up to 15 m/s (49 ft/s), which is due to the larger swept volume of the overbored barrel.
This inertial release uses the recoil of a discharged round to unlock the breech. The action was designed to only unlock after firing or with the use of the slide release and not by dry firing like many modern shotguns. All model 520s were only offered in 12 gauge until 1928. [10] Stevens Model 520 (1920-1924)
An ideal choke would be a cylinder bore (the loosest) as the hunter wants the shot to spread out as quickly as possible. If this hunter were using a full choke (the tightest) at 20 m (22 yd), the shot would be very close together and cause an unnecessarily large amount of damage to the rabbit, or, alternatively, a complete miss of the rabbit.
The length of the barrel (especially for larger guns) is often quoted in multiples of the caliber, used, for example, in US naval rifles 3 in (76 mm) or larger. [2] The effective length of the barrel (from breech to muzzle) is divided by the barrel diameter to give a dimensionless quantity.
Choke valves are important for naturally-aspirated gasoline engines because small droplets of gasoline do not evaporate well within a cold engine. By restricting the flow of air into the throat of the carburetor, the choke valve reduces the pressure inside the throat, which causes a proportionally greater amount of fuel to be pushed from the ...
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