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2. Caliber conversion device - Wikipedia

   en.wikipedia.org/wiki/Caliber_conversion_device

   Conversions for rifles and carbines of larger caliber, such as the AK-47 or Thompson submachine gun include a rifled insert barrel extending beyond the length of the chamber. [ 9 ] [ 10 ] One exception to the use of a special lightweight bolt was the Colt Service Ace , offered as a complete pistol or as a conversion kit for the M1911.

3. Muzzle brake - Wikipedia

   en.wikipedia.org/wiki/Muzzle_brake

   A muzzle brake or recoil compensator is a device connected to, or a feature integral (ported barrel) to the construction of, the muzzle or barrel of a firearm or cannon that is intended to redirect a portion of propellant gases to counter recoil and unwanted muzzle rise. [1]

4. Muzzle booster - Wikipedia

   en.wikipedia.org/wiki/Muzzle_booster

   Animation of the Vickers muzzle booster operation, showing the expanding gases pushing the barrel to the rear relative to the cooling jacket. A Vickers-type muzzle (or recoil) booster, the "typical" type, consists of two parts: a flared "cup" on the muzzle of the barrel, and a perforated tube around the end of the muzzle, attached to the main body of the weapon.

5. Hydraulic recoil mechanism - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_recoil_mechanism

   The usual recoil system in modern quick-firing guns is the hydro-pneumatic recoil system. In this system, the barrel is mounted on rails on which it can recoil to the rear, and the recoil is taken up by a cylinder which is similar in operation to an automotive gas-charged shock absorber, and is commonly visible as a cylinder mounted parallel to ...

6. Choke (firearms) - Wikipedia

   en.wikipedia.org/wiki/Choke_(firearms)

   The advantages touted for "overbore" are a perceived reduction in recoil, and a lessened shot deformation for improving shot patterns. Generally the constriction ranges for chokes will be 0.00-1.15 mm (0.00-0.045 inch) while the constriction for relatively common turkey chokes may be as much as 2.50 mm (0.10 inch).

7. Recoil buffer - Wikipedia

   en.wikipedia.org/wiki/Recoil_buffer

   This type of buffer cushions the battering force of repeated metal on metal impact, reducing wear on parts and lengthening the service life of the firearm. [4] Reduction of perceived recoil discomfort is an immediate added benefit of this type of recoil buffer. [4] Some pneumatic recoil buffers used in firearms are fast, low-power gas springs ...

8. Muzzle rise - Wikipedia

   en.wikipedia.org/wiki/Muzzle_rise

   Illustration of forces in muzzle rise. Projectile and propellant gases act on barrel along barrel centerline A. Forces are resisted by shooter contact with gun at grips and stock B. Height difference between barrel centerline and average point of contact is height C. Forces A and B operating over moment arm / height C create torque or moment D, which rotates the firearm's muzzle up as ...

9. Forearm (firearm component) - Wikipedia

   en.wikipedia.org/wiki/Forearm_(firearm_component)

   Near the front of the forearm there is often an underside sling swivel stud and sometimes also a barrel-band to secure the forearm to the barrel (as seen in the photo). [ 1 ] [ 2 ] Some forearms are equipped with additional heat shields to protect the user from heat radiating from the barrel when the firearm is fired.