JBL Reaper 100 Rail Speargun Aircraft grade aluminum barrel with integrated rail for ultimate accuracy and minimal flex. Body measures 50in without shaft 9/32in heat treated stainless steel shaft with integrated Point and flopper (754-SBR.) Threaded shafts are available separately (748-SBF6M). Two 24in x 5/8in bands (324E) All aluminum construction for bomb proof durability.. Integrated float chamber