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2. Gauge (firearms) - Wikipedia

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

   A 12-gauge shotgun, nominally 18.5 mm (0.73 in), can range from a tight 18 mm (0.71 in) to an extreme overbore of 20 mm (0.79 in). Some also claim an increased velocity with the overbored barrels, up to 15 m/s (49 ft/s), which is due to the larger swept volume of the overbored barrel.

3. Table of handgun and rifle cartridges - Wikipedia

   en.wikipedia.org/wiki/Table_of_handgun_and_rifle...

   Common rifle cartridges, from the largest .50 BMG to the smallest .22 Long Rifle with a $1 United States dollar bill in the background as a reference point.. This is a table of selected pistol/submachine gun and rifle/machine gun cartridges by common name.

4. .25 ACP - Wikipedia

   en.wikipedia.org/wiki/.25_ACP

   Source(s): Buffalo Bore [2] Ballistics 101 [ 3 ] The .25 ACP ( Automatic Colt Pistol ), also known as the .25 Auto , .25 Automatic , or 6.35×16mmSR ) is a semi-rimmed , straight-walled centerfire pistol cartridge introduced by John Browning in 1905 alongside the Fabrique Nationale M1905 pistol.

5. List of rifle cartridges - Wikipedia

   en.wikipedia.org/wiki/List_of_rifle_cartridges

   32 gauge — .526 in (13.4 mm) 28 gauge — .550 in (14.0 mm) 24 gauge — .579 in (14.7 mm) 20 gauge — .615 in (15.6 mm) 16 gauge — .663 in (16.8 mm) 14 gauge — .693 in (17.6 mm) 12 gauge — .729 in (18.5 mm) 10 bore — .775 in (19.7 mm) 8 bore — .835 in (21.2 mm) 6 bore — .919 in (23.3 mm) 4 bore — 1.052 in (26.7 mm) 2 bore ...

6. Shotgun cartridge - Wikipedia

   en.wikipedia.org/wiki/Shotgun_cartridge

   The 4, 8, 24, and 32 gauge guns are collector items. There are also some shotguns measured by diameter, rather than gauge. These are the .410 (10.4mm), .380 (9mm), and .22 (5.5mm); these are correctly called ".410 bore", not ".410-gauge". The .410 bore is the smallest shotgun size which is widely available commercially in the United States.

7. Bore gauge - Wikipedia

   en.wikipedia.org/wiki/Bore_gauge

   When using a micrometer to set a dial bore gauge, the accuracy of the measurement will be 0.002 inches or 0.0508 millimeters. A ring gauge can be used to obtain higher accuracy at a higher cost and higher time requirement. When a dial bore gauge is set using a ring gauge, overall accuracy can be within 0.0001 inches or 0.00254 millimeter. [2] A ...

8. M1941 Johnson rifle - Wikipedia

   en.wikipedia.org/wiki/M1941_Johnson_rifle

   The M1941 Johnson Rifle is an American short-recoil operated semi-automatic rifle designed by Melvin Johnson prior to World War II. The M1941 unsuccessfully competed with the contemporary M1 Garand rifle but was used in limited numbers by the US Marines [ 2 ] during the Second World War.

9. Go/no-go gauge - Wikipedia

   en.wikipedia.org/wiki/Go/no-go_gauge

   The lower image is a plain plug gauge used to check the size of a hole; the green end is the go, and the red end is the no-go. The tolerance of the part that this gauge checks is 0.30 mm, where the lower size of the hole is 12.60 mm and the upper size is 12.90 mm, every size outside this range is out of tolerance. This may be initially ...