Maple Leaf innner barrel installation (w Monster hop) at G17 GBB, chrono test 

Video in spanish with summarizing notes in english.
Installation and Test of Maple Leaf 6.01 precision inner barrel for airsoft GBB pistol ( Army R17 G17).
The new inner barrel is 16 mm longer than original so I also installed a Pro-arms Silencer adapter to protect the exposed inner.
Chronograph test shows at least 20 fps more after the change.