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A common method of expressing the amount of constriction is by "points". A "point" is equivalent to 0.025 mm (0.001 in) of constriction of the inner diameter of a choke. Hence, 40 points of constriction would correspond to a constriction of 0.040 inch (≈ 1 mm) in the inner diameter of a choke, corresponding to "Extra Full".
The degree of deformation is most acute with fuller chokes, which were among the most widely used in stock shotguns up until the 1980s and 1990s. Early shotgun slugs were "rifled" with deformable fins cast into the outside of the soft lead slug, which allowed the slug to swage down to fit the choke. With an open choke, the reduction in diameter ...
The shotgun is available with 12/76mm or 12/89mm chambers and either 610, 650, 710 or 750 mm barrels. The MP-153 is manufactured with fixed choke available as Cylinder, Modified or Full variants, or with screw in chokes with Cylinder, Improved Cylinder, Modified, Improved Modified, Full and Extra Full variants available. Normally there are 3 or ...
Gauge was determined from the weight of a solid sphere of lead that will fit the bore of the firearm and is expressed as the multiplicative inverse of the sphere's weight as a fraction of a pound, e.g., a one-twelfth pound lead ball fits a 12-gauge bore. Therefore with a 12-gauge, it would take 12 balls of lead of the same size as the 12 gauge ...
Dragon's breath is normally chambered in 12-gauge 2 + 3 ⁄ 4 ″ (18.5 mm × 69.9 mm) shot shells. The rounds are safe to fire out of an improved cylinder bore as well as a modified choke barrel, common on many shotguns.
The Mossberg 500 is a series of pump-action shotguns manufactured by O.F. Mossberg & Sons. [1] The 500 series comprises widely varying models of hammerless repeaters, all of which share the same basic receiver and action, but differ in bore size, barrel length, choke options, magazine capacity, stock and forearm materials.
Modified choke or cylinder bore was furnished at no extra charge on special order only. The M37 was chambered in the following gauges and shells respectively: 12, 16, 20, 28, and 410 using 2 + 3 ⁄ 4-inch, 2 + 7 ⁄ 8-inch, 3-inch shells. The M37 unit weight was between 5 + 3 ⁄ 4 and 6 lbs; the fluctuation was dependent on the chambered gauge.
The final bore is the FABARM choke system which consists of standard choking followed by a cylinder profile at the muzzle which serves to improve shot patterns and distribution. [3] The muzzle is threaded to accept one of five different chokes or a muzzle brake/compensator. Some models were sold with a ventilated barrel shroud.