polygonal bore

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• Polygonal rifling — is a type of rifling wherein the traditional lands and grooves are replaced by hills and valleys in a rounded polygonal pattern, usually a hexagon or octagon. HistoryWhile polygonal rifling has been around since the earliest days of rifled… …   Wikipedia

• polygonal rifling —    Helical grooves in the bore of a firearm barrel to impart rotary motion to a projectile …   Forensic science glossary

• Heckler & Koch G41 — Infobox Weapon name=G41 caption= origin=flag|West Germany type=Assault rifle is ranged=yes service= used by=See Users wars=2007 Lebanon conflict designer=Heckler Koch design date=1981 manufacturer=Heckler Koch production date= number=… …   Wikipedia

• Heckler & Koch HK41 — Infobox Weapon name=Heckler Koch 41 caption=HK 41 rifle with mounted scope origin=flagcountry|Germany type=Sporting and Target Rifle is ranged=yes service= used by= wars= designer= design date= manufacturer=Heckler Koch production date=1964 1976… …   Wikipedia

• Heckler & Koch USP — Type Pistol Place of origin …   Wikipedia

• Internal ballistics — Internal ballistics, a subfield of ballistics, is the study of a projectile s behavior from the time its propellant s igniter is initiated until it exits the gun barrel. The study of internal ballistics is important to designers and users of… …   Wikipedia

• Rifling — refers to the helix shaped pattern in the barrel of a firearm, which imparts a spin to a projectile around its long axis. This spin serves to gyroscopically stabilize the projectile, improving its aerodynamic stability and accuracy.Rifling is… …   Wikipedia

• JERUSALEM — The entry is arranged according to the following outline: history name protohistory the bronze age david and first temple period second temple period the roman period byzantine jerusalem arab period crusader period mamluk period …   Encyclopedia of Judaism

• Canon rayé — Le rainurage désigne le processus de fabrication de rainures hélicoïdales par l alésage du canon d une arme à feu. Ces rayures font tourner le projectile sur lui même autour de son axe longitudinal, cette rotation permettant la stabilisation… …   Wikipédia en Français

• Western architecture — Introduction       history of Western architecture from prehistoric Mediterranean cultures to the present.       The history of Western architecture is marked by a series of new solutions to structural problems. During the period from the… …   Universalium

• Early Modern warfare — is associated with the start of the widespread use of gunpowder and the development of suitable weapons to use the explosive. It was first invented in China and then later spread to the Middle East. It then found its way into eastern Europe… …   Wikipedia