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2. 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 .

3. Barrel nut - Wikipedia

   en.wikipedia.org/wiki/Barrel_nut

   The barrel nut is a round slug, or formed sheet metal part with threads perpendicular to the length of the nut. The nut sits in a hole inside the forging and a standard bolt is threaded into the barrel nut from outside the sheet metal. They are preferred over a standard nut and bolt, because they do not require a flange to be machined or forged ...

4. Nut (hardware) - Wikipedia

   en.wikipedia.org/wiki/Nut_(hardware)

   Barrel nut, barrel bolt, binding barrel, Chicago screw, post and screw or connector bolt ... 3 ⁄ 16: 0.1875 4.763 5.18 1.65 #3: 3 ...

5. CAR-15 - Wikipedia

   en.wikipedia.org/wiki/CAR-15

   The first prototype was essentially an M16E1/M16A1 rifle with 5 inches of the barrel removed resulting is a barrel 15 inches (381 mm) in length, so that it ended just forward of the front sight base. Because of the shorter barrel and no space to attach a bayonet, the bayonet mounting lugs removed. Due to the shortened barrel with the gas port ...

6. Mossberg 500 - Wikipedia

   en.wikipedia.org/wiki/Mossberg_500

   The model 500 HS410, or "Home Security" model, is available in .410 gauge only, and is specifically designed for defensive use. It comes with a youth-sized stock, a vertical foregrip, and a special muzzle brake and spreader choke (to help produce wider patterns when using buckshot) on an 18.5-inch (47 cm) bead sight barrel. The .410 gauge round ...

7. Tap and die - Wikipedia

   en.wikipedia.org/wiki/Tap_and_die

   where is the tap drill size, is the major diameter of the tap (e.g., 3 ⁄ 8 in for a 3 ⁄ 8-16 tap), and / is the thread pitch (1 ⁄ 16 inch in the case of a 3 ⁄ 8-16 tap). For a 3 ⁄ 8 -16 tap, the above formula would produce 5 ⁄ 16 , which is the correct tap drill diameter.