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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 .
Sizes that may interchange, depending on the precision needed, include 2 mm (close to 5 ⁄ 64 inch (1.98 mm)), 4 mm (close to 5 ⁄ 32 inch (3.97 mm)) and 8 mm (close to 5 ⁄ 16 inch (7.94 mm)). In reality, a wrench with a width across the flats of exactly 15 mm would fit too tightly to use on a bolt with a width across the flats of 15 mm.
Barrel nut, barrel bolt, binding barrel, Chicago screw, post and screw or connector bolt ... Note that flat (spanner or wrench) sizes differ between industry ...
Spline drives were specified for 5, 6.3, 8, 10, 12, 14, 16, and 20 mm size screws. [86] Its primary advantage is its ability to resist cam-out , so it is used in high-torque applications, such as tamper-proof lug nuts , cylinder head bolts, and other engine bolts.
Initial barrel/shroud options were 2 1/2-inch, 4-inch, 6-inch, and 8-inches. A custom barrel nut wrench and feeler gauge were supplied with each pistol, and barrel changes could be accomplished in two minutes or less. [5]
A nutdriver or nut driver is a hand tool for tightening or loosening nuts and bolts. It essentially consists of a socket attached to a shaft and cylindrical handle and is similar in appearance and use to a screwdriver. [1] They generally have a hollow shaft to accommodate a shank onto which a nut is threaded.
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