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Chokes are implemented as either screw-in chokes, selected for particular applications, or as fixed, permanent chokes, integral to the shotgun barrel. Chokes may be formed at the time of manufacture either as part of the barrel, by squeezing the end of the bore down over a mandrel, or by threading the barrel and screwing in an interchangeable ...
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 ...
Switching between firing modes is done by pressing a button above the foregrip, and sliding the foregrip slightly forwards or backwards. The barrel is chrome lined and features screw-in choke tubes. [4] [1] Unlike its predecessor, the SPAS-15 is fed by a detachable box magazine. [1]
The barrel seal activator is meant to be removed when using 3 + 1 ⁄ 2-inch or 3-inch shells, and installed when using shorter shells. [1] Some Model 11-87s have interchangeable screw-in chokes; other barrels are available with fixed chokes. Barrels are not interchangeable between the Model 1100 and Model 11-87. [1]
The original 870 models were offered with fixed chokes. In 1986 Remington introduced the new Remington "Rem Choke" system of screw-in chokes (also fitted to Remington model 1100 auto-loading shotguns at the same time). Initially, the Rem Chokes were offered only in 12 gauge in barrel lengths of 21, 26 and 28 in (530, 660 and 710 mm).
The MX8 was also one of the first guns to have interchangeable screw in chokes in the bottom barrel. [6] This feature is now found in nearly every modern shotgun. Also included was the revolutionary detachable v-springs trigger assembly. Perazzi preferred v-springs over the traditional coil trigger assembly due to their better trigger pulls. [3]
The Spartan 310 has a walnut stock and fore-end, the shooter can select automatic ejectors or extractors, and a ventilated barrel rib. It uses screw-in SPR choke tubes.By default, the bottom barrel fires first, but the shooter can select the top barrel to fire first by pushing the trigger blade forward when the gun is loaded and closed. [4]
Barrels with an integral muzzle brake are often said to be ported. The concept of a muzzle brake was first introduced for artillery. It was a common feature on many anti-tank guns, especially those mounted on tanks, in order to reduce the area needed to take up the strokes of recoil and kickback. They have been used in various forms for rifles ...