The latest review from Team Iron Foot covers this upgrade set from Maple Leaf for the WE G17 Gen 3 Gas Blowback Pistol... "Maple Leaf Hop Unit & Inner Barrel Set - Fitting & Review for WE Gen 3 Glock 17 - How to improve the power (fps), grouping / consistency of your airsoft gas blowback pistol.

We show you what's included in the maple leaf hop unit and inner barrel set, how to assemble it and then how to install it in a WE Gen 3 Glock 17. Similar kits are available for the hi-capa. We then perform chronograph and grouping tests - putting it alongside the standard set up.

A simple upgrade that costs around £40 from most UK retailers."