The Laylax Nineball 6.00mm Inner Barrel for Umarex G17 is a great power and accuracy upgrade for the Umarex G17 gas blowback and C02 series airsoft handguns. The super tight bore means less loss of air, resulting in a more direct application of air to propel the BB. 
-Compatible with Umarex Gas and CO2 (VFC) G17 pistols
-Steel Construction; made in Japan
-6.00mm inner diameter
-97mm long
-To be used with high quality BBs