Starter Shoulder Extension Upgrade EN The Cross-Starter allows you to enhance your Pro/Mag-Starter and increase your comfort while playing, and improve your in-game aim even more precisely than the classic Starter CQB. Upgrading to the Cross-Starter should take you 5 minutes. For video setup,  you can check our YouTube tutorial Playlists . Make sure you work in a clear area and be very careful, some parts can be easily lost. ________________________________________________________________________________________________________________________________________________ Insert the Starter’s tube in the stock upgrade’s connector. Tighten the screw on the connector (not too strong, you do not want to break it). Loosen the stock's screw and position it in a square (90°) angle with the tube. Adjust the tube with the top of the stock and tighten the screw (arrowed in 3 rd picture). You can adjust the rear tube and stock to fit your gameplay, and attach the sling. We recommend having the cheek rest parallel to the Starter's tube, but it's up to you Enjoy!