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A zinc-Parkerized civilian .45 ACP Springfield Armory, Inc. M1911-A1 pistol. Parkerizing is a method of protecting a steel surface from corrosion and increasing its resistance to wear through the application of a chemical phosphate conversion coating. It was usually applied to firearms.
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A chrome-lined bore offers a more durable, more corrosion resistant, and easier-to-clean barrel for the end user to maintain and is rarely found on precision bolt-action sniper rifles. The barrels of the "First Generation" rifles were said to be made from the hammer-forged blanks used for M240 General Purpose Machine Gun production at the FN ...
[1] [2] The Scouts are made with 18.25 inches (46.4 cm) barrels, as opposed to the original M6's 14 inches (36 cm) barrel length, to comply with National Firearms Act. The later models have large over-sized trigger guards [3] and Picatinny rails for mounting a wide range of sights and scopes. They come in stainless steel or with a Parkerized ...
The above proof round pressure requirements for the 9 mm and 12.7 mm rounds established by the British Ministry of Defence are higher than the current (2008) C.I.P. proof round pressure requirement legislation for the civilian equivalent 9 mm Parabellum (C.I.P. P max rating 235 MPA / (34,083 psi) and .50 Browning (C.I.P. P max rating 370 MPA ...
A proof test is a form of stress test to demonstrate the fitness of a load-bearing or impact-experiencing structure. An individual proof test may apply only to the unit tested, or to its design in general for mass-produced items. Such a structure is often subjected to loads above those expected in actual use, demonstrating safety and design margin.
The PGU-12/B, issued only by the U.S. Air Force, had a greatly increased maximum allowable pressure rating of 20,000 psi (138 MPa), which was sufficient to propel the 130 grain (8.4g) FMJ bullet at 1,125 ft/s (343 m/s) from a 6-inch (150 mm) test barrel, and 950–1,000 ft/s (290–300 m/s) from a 4-inch (100 mm) revolver barrel.