Product Description Specifications Maple Ridge Armoury Gas Tubes are constructed of US Mil – Spec 304 Stainless Steel and are offered in a variety of lengths to suit your specific application.Available in the following lengths: 6.75” Pistol Length 9.75” Carbine Length 11.75” Mid–Length 15.125” Rifle Length Short Description: Weight: .006 kg Dimensions: 18 x 10 x 1 cm Size: Pistol Length