Tan receiver & accessories True milsim look paintball marker with proven performance and reliability All aluminum receiver Tippmann's proven inline bolt system AR15 look with a 6 position collapsible and folding stock Four Picatinny rails on the shroud   The Tippmann Sierra has the looks, performance and reliability you would expect from a much higher priced marker. The Tippmann Sierra marker features a high performance 11" ported barrel, top and side Picatinny rails for accessories, and a magazine that doubles as tool storage. Available upgrades sold separately are an E-Trigger Kit, Response Trigger and the Cyclone Feed System.