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A crown may be re-cut with relative ease, and this can fix any problems caused by a defective or damaged crown, by ensuring an even release of the bullet. [42] An 11 degree crown has the best accuracy potential, and should be applied to a barrel to get the best gas flow at the bullet exit point of the barrel.
Elaborate hand-cut and filed head lugs which have been outlined in a contrasting colour (luglining) on a Hetchins frame. Lugged steel frame construction is a method of building bicycle frames using steel tubing mated with socket-like sleeves, called lugs. For most of the bicycle's history, steel has been the primary material for bicycle frames ...
Internal ballistics (also interior ballistics), a subfield of ballistics, is the study of the propulsion of a projectile. In guns, internal ballistics covers the time from the propellant 's ignition until the projectile exits the gun barrel. [1] The study of internal ballistics is important to designers and users of firearms of all types, from ...
Rolling (metalworking) In metalworking, rolling is a metal forming process in which metal stock is passed through one or more pairs of rolls to reduce the thickness, to make the thickness uniform, and/or to impart a desired mechanical property. The concept is similar to the rolling of dough. Rolling is classified according to the temperature of ...
The Walther PDP (Performance Duty Pistol) is a 9×19mm Parabellum semi-automatic pistol designed in 2021 by Walther Arms as a replacement for the Walther PPQ.The PDP has been designed to be more modular than previous Walther handguns, and has been described by Walther as their flagship handgun.
On threaded barrel models there is a small removable protective cap installed on the threads of the barrel crown. The PPX was made from a black polymer frame with either a tenifer coated slide or a stainless steel slide. The sights are dovetailed into the slide and are made from steel.
A purlin (or historically purline, purloyne, purling, perling) is a longitudinal, horizontal, structural member in a roof. In traditional timber framing there are three basic types of purlin: purlin plate, principal purlin, and common purlin. Purlins also appear in steel frame construction. Steel purlins may be painted or greased for protection ...
Queen Anne pistols are flintlock pistols with three defining characteristics. They have a turn-off barrel, typically with a swelled cannon muzzle, and are chamber-loaded. The body of the pistol (the breech) and the lock-plate are forged as a single piece. The frizzen spring is located to the rear of the frizzen rather than the conventional ...