T-N.T. Studio APS-X HOP-UP System H+ Retrofit Kit for GHK M4 GBB (320mm) Length-(mm)_280 Sling hook is located on

Sling hook is located on both left & right

This allows you to have rails anywhere you need them and nowhere you don’t

This gun can be strip-down like the real steel Matt Black Finish look very realistic

please check out the "RWC Milspec Size Stock Tube for Systema PTW"

Excellent Craftsmanship with Textured grip and Solid Pistol Frame

T-N.T. Studio APS-X HOP-UP System H+ Retrofit Kit for GHK M4 GBB (320mm) Length-(mm)_280 Sling hook is located onT N. T. Studio APS X HOP UP System H+ Retrofit Kit for GHK M4 GBB (320mm) Aluminum Construction Design For Upgrade the Origianl Parts The kit ensures better accuracy due to better and finer tuning of the hop up. Suitable For GHK M4 Series Airsoft Gas Blow Back GBB Rifle