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  2. List of 3D-printed weapons and parts - Wikipedia

    en.wikipedia.org/wiki/List_of_3D-printed_weapons...

    Oceania Defense has made three variations of the 5.56mm/.223 suppressor so far: the 556-45 Samson (an AR-15 suppressor designed to operate on semi auto Short-barreled rifle to 12.5" barrels), 556-SBR (designed for hard use on 10.5" barrel for AR-15 firearms in 5.56mm/.223 ammunition) and 556-45 Suppressor (direct thread on suppressor which ...

  3. M1156 Precision Guidance Kit - Wikipedia

    en.wikipedia.org/wiki/M1156_Precision_Guidance_Kit

    After that, a new version known as the Long Range PGK will enable accuracy with XM1113 projectiles out to 70 km (43 mi) when fired from 58-caliber barrels of artillery pieces developed from the Extended Range Cannon Artillery (ERCA) program, as well as being compatible with legacy projectiles and being able to operate in a near-peer GPS threat ...

  4. Polygonal rifling - Wikipedia

    en.wikipedia.org/wiki/Polygonal_rifling

    Conventional eight groove rifling on the left, and octagonal polygonal rifling on the right. Polygonal rifling (/ p ə ˈ l ɪ ɡ ə n əl / pə-LIG-ə-nəl) is a type of gun barrel rifling where the traditional sharp-edged "lands and grooves" are replaced by less pronounced "hills and valleys", so the barrel bore has a polygonal (usually hexagonal or octagonal) cross-sectional profile.

  5. Squeeze bore - Wikipedia

    en.wikipedia.org/wiki/Squeeze_bore

    The original patent filed by Hermann Gerlich in 1932 [6]. The squeeze bore concept was first patented by German inventor Carl Puff in 1903, [7] [8] even though the general principle was known already in 19th century and later applied in lighter fashion on Armstrong guns, on which only the muzzle yet not the barrel itself was of slightly smaller diameter (to cast off the sealing leather-bag ...

  6. Barrel threads - Wikipedia

    en.wikipedia.org/wiki/Barrel_threads

    Attaching the barrel to the receiver using a barrel nut and a barrel with a shoulder is an alternative to action threads, which has been used in firearms such as the Sten gun and AR-15. Hand tools Quick barrel change systems is an increasingly popular alternative, as seen in for example SIG Sauer 200 STR, Roessler Titan or Blaser R8.

  7. Forensic firearm examination - Wikipedia

    en.wikipedia.org/wiki/Forensic_firearm_examination

    The caliber is the diameter of the barrel. The twist is the direction of the striations left by the barrel's rifling, clockwise (right-handed) or counterclockwise (left-handed). Most barrels will have a right-handed twist with the exception of weapons created by the Colt's Manufacturing Company which uses left-handed twists.

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    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Internal ballistics - Wikipedia

    en.wikipedia.org/wiki/Internal_ballistics

    Barrel time - the time from when the projectile starts to move until it exits the barrel. Diagram of internal ballistic phases. The burning firearm propellant produces energy in the form of hot gases that raise the chamber pressure which applies a force on the base of the projectile, causing it to accelerate. The chamber pressure depends on the ...