international. To know more on International Roaming, click here. Airtel's Roaming service allows you to use your mobile phone to make or receive calls from almost anywhere in World. A monthly rental of Rs 99 will be charged on International Roaming in addition to the international roaming rates.Rental will be charged only in case of an incoming/outgoing call or outgoing SMS.njoy up to 90% discount on voice & data in popular countries by subscribing to airtel International Roaming packs. Click here for details. Enjoy International roaming calls in USA, UAE, Singapore, Qatar, Nepal and Saudi Arabia @Rs30/min.Offer applicable on select network and valid for limited period only!
Barrel rifling was invented in Augsburg, Germany at the end of the fifteenth century. In 1520 August Kotter, an armourer of Nuremberg, Germany improved upon this work. Though true rifling dates from the mid-16th century, it did not become commonplace until the nineteenth century.espite differences in form, the common goal of rifling is to deliver the projectile accurately to the target. In addition to imparting the spin to the bullet, the barrel must hold the projectile securely and concentrically as it travels down the barrel. This requires that the rifling meet a number of tasks:
Conventional eight groove rifling on the left, and octagonal rifling on the right. Polygonal rifling /pÉËlÉªÉ¡ÉnÉl/ is a type of gun barrel rifling where the traditional lands and grooves are replaced by hills and valleys in a rounded polygonal pattern, usually taking the form of a hexagon or octagon.n the Glock pistol, for instance, octagonal rifling is used in the large diameter .45 ACP bore, which has an 11.23 mm (0.442 in) diameter, since it resembles a circle more closely than the hexagonal rifling used in smaller diameter bores.