Jeidanten installs fiber optic sight on the GHK G17 Gen5 MOS style steel sliding sleeve and steel outer tube set. Produced by BFA, this is an upgrade for the pistol. Crafted using CNC precision turning and milling, this set features a durable military-standard QPQ surface treatment. Compatible with the GHK G17 Gen5 MOS, the steel sliding sleeve weighs 205g, the steel outer tube set weighs 63g, and the steel sliding sleeve upper cover (including screws) weighs 16g.