With a wide range of spring, barrel, and fps options this customizable blaster designed by Captain Slug is an easy addition to any arsenal. This listing doesn't include the 3D-printed parts, but the STL files are linked down below. 3D parts kits are available here.Please Note: This listing is for the Flat Bar Based Version of the V4 Caliburn. *The parts in this kit are raw cut and may require minor cleanup to fit into your build. FEATURES:• Captain Slug Caliburn 4 Hardware Kit• Stainless Steel 4-40 screws• Comes with all of the hardware already cut to length• Ready for assembly• Designed by Captain Slug• Licensed and Authorized by the legendary Slug himself• Premium CNC aluminum bars INCLUDES:Everything you need to print and assemble this blaster yourself, including• 1 2.03 x 280mm K25 Spring• 1 0.527 x 14in Aluminum Barrel• 1 CNC-milled Ramcore• 40 #4-40 x 3/8in Flat Head Screws• + More PERFORMANCE:Average FPS with a 0.527 x 14in barrel• 110 FPS with a K31 spring (280mm)• 130 FPS with a 788 spring (266mm)• 175 FPS with a K25 spring (280mm)• 190 FPS with a K26 spring (280mm) SPECS:• Material: Multiple LINKS:• Caliburn 4 Assembly Instructions• STL Files• Compatible Standard Talon Magazines