引用:
原帖由 vgrdragon1 於 2016-11-11 22:22 發表 
因為真鐵H&K的barrel用左一種多角度內壁設計取代傳統膛線。
如果上Silencer就要threaded barrel。
師兄正解
http://hk-usa.com/hk-models/vp9-grey/
Quote:
HK’s famous cold hammer forged barrel —made from canon grade steel —ensures long service life. Similar HK barrels on P30 models have fired more than 90,000 rounds in endurance tests in 2010. The
polygonal bore profile, with no traditional lands-and-grooves rifling, contributes to longer service life as well as a slight increase in muzzle velocity
