![]() This results in a calculated delay, allowing the projectile to exit the barrel and gas pressure to drop to a safe level before the case is extracted from the chamber. The selected angles of the recesses and the incline on the locking piece produce a velocity ratio of about 4:1 between the bolt carrier and the bolt head. A portion of this force is transmitted through the rollers projecting from the bolt head, which are cammed inward against the inclined flanks of the locking recesses in the barrel extension and to the angled shoulders of the locking piece. When fired, expanding propellant gases produced from the burning powder in the cartridge exert rearward pressure on the bolt head transferred through the base of the cartridge case as it is propelled out of the chamber. The heavier bolt carrier lies up against the bolt head when the weapon is ready to fire and inclined planes on the front locking piece lie between the rollers and force them out into recesses in the barrel extension. The two-part bolt consists of a bolt head with rollers and a bolt carrier. The MP5 had excellent performance, especially when it comes to accuracy, thanks to its semi-free bolt and roller-delayed blowback. The weapon was also modified to accept muzzle attachments such as flash hiders or silencers. The sights on the MP5 was revised by H&K after trials, the rear sight changed to a rotating drum calibrated at 25-100 meters, the exposed front sight hooded, and the finned barrel smoothened. The Swiss police adopted the MP5 in the same year, becoming the first country outside of Germany to adopt this weapon. This designation then continued to be carried over up to this date.
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