This is a Top Mounted P-Rail Bi-Pod Items Required: Tube 8mm OD - 6mm ID X 250mm L Tube 6mm OD - 4mm ID X 300mm L 2 X Bolt M5 X L 2 X Compression Spring 8.5mm ID X 30mm L 2 X Bolt M3 X 10mm L I'll be posting Pics as soon as the printers stop lol !Don't forget to CHECK OUT my other designs and FOLLOW my daily KooKoo uploads, Enjoy ;)