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The M14 is an accurate and reliable rifle, but it has had less than optimum results from being used with a sound suppressor. There are a number of factors which contribute to this. The first pertains to the fine threads on the muzzle which were not intended for attaching and removing different muzzle devices.
A metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter D (the maximum thread diameter) and the pitch P, both expressed in millimetres and separated by a dash or sometimes the multiplication sign, × (e.g. M8-1.25 or M8×1.25). If the pitch is the normally used "coarse" pitch listed in ISO 261 or ...
Typically, many rifles use thread diameters in the range between 25–27 mm (0.98–1.06 in). [citation needed] Many older rifles from the first half of the 20th century use a thread pitch around 2 mm (12.7 TPI), while many modern rifle use thread pitches around 1.5 mm (16.93 TPI). Fine threaded systems intended for hand tightening typically ...
The standard designation for a UTS thread is a number indicating the nominal (major) diameter of the thread, followed by the pitch measured in threads per inch.For diameters smaller than 1 / 4 inch, the diameter is indicated by an integer number defined in the standard; for all other diameters, the inch figure is given.
The suppressor was the M14SS-1, designed for the M14 rifle, and forty suppressors were sent unofficially to the 9th Infantry Division in Vietnam during early 1969 for combat evaluation, and an undisclosed number were procured under ENSURE Number 360.1, but the suppressor was not adopted officially.
The Springfield Armory M1A is a semi-automatic rifle made by Springfield Armory, Inc., beginning in 1971, based on the M14 rifle, for the civilian and law enforcement markets in the United States. "M1A" is a proprietary name for Springfield Armory's M14-pattern rifle.
The major minus pitch technique also works for inch-based threads, but you must first calculate the pitch by converting the fraction of threads-per-inch (TPI) into a decimal. For example, a screw with a pitch of 1/20 in (20 threads per inch) has a pitch of 0.050 in and a 1 ⁄ 13 in pitch (13 threads per inch) has a pitch of 0.077 in.
Additionally, the company makes flash suppressors for installation on the M240 machine gun and M249 SAW with the NATO Stock Number 1005-01-600-857, PN 1041V. [15] Vortex Flash Hiders can be installed on traditional bolt-action rifles and rifles such as the Ruger 10/22, Ruger Mini-14 and Ruger Mini-30, if the barrel is cut for the appropriate ...