Well Tobi needed help installing his new Madbull Tightbore. I made a quick tutorial for him. Thought I would share it with the rest of you guys.The gun pictured I bought from:\n\nhttp://www.airsoftgi.com/product_info.php?cPath=139_70&products_id=2308 Airsoft, AirsoftGI, M4, Tightbore, Tutorial