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CALIBURN U ASSEMBLY INSTRUCTIONS
The Caliburn U is a Mag-Fed Pump-Action Homemade Nerf Blaster design released as a CC-NC license file set by Captain
You are welcome to and encouraged to modify the files in any way you want. The Majority of the parts can be printed
with infill as low as 20% in PLA, but I would recommend printing in layers of 300 Micron or smaller. I would recommend
Hardware kits and Full Blasters are available for sale as made-to-order items. I'm producing these myself in what
DO NOT STORE IN TEMPERATURES ABOVE 100F. Storing the blaster inside of a car in warmer months will
cause the printed parts to distort or warp beyond their intended shape. If you have to store one in a vehicle,
DO NOT use this blaster for indoor wars or wars involving very short distances. The muzzle velocities this
design can reach are between 150fps and 210fps depending upon the darts used and the spring installed. If
indoor use is intended, obtain the lower fps springs that are currently available for this design (K31 and 788)
Slug (http://www.captainslug.com).
a minimum of 1.5mm walls/perimeters for every part.
remains of my free time.
https://www.etsy.com/shop/CaptainSlug
store it in the trunk.
and use them.
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Summary of Contents for Captain Slug CALIBURN U
- Page 1 CALIBURN U ASSEMBLY INSTRUCTIONS The Caliburn U is a Mag-Fed Pump-Action Homemade Nerf Blaster design released as a CC-NC license file set by Captain Slug (http://www.captainslug.com). You are welcome to and encouraged to modify the files in any way you want. The Majority of the parts can be printed with infill as low as 20% in PLA, but I would recommend printing in layers of 300 Micron or smaller.
- Page 2 For most of the above hardware list the quantities are the MINIMUM required for assembly. Easily-lost items will have several spares and I typically include extras of the majority of the items. To assemble this blaster you will need a Slotted Screwdriver, Small Philips Screwdriver, 3/8 Combination Wrench, and a Round Needle File.
- Page 3 Above is a list of every printed part needed to assemble this blaster. The majority of the through holes should print to the required tolerance, but you will likely have one or two that may require minimal filing. Also make sure to trim off any burrs or oversized edges.
- Page 4 Place a 10-32 hex nut onto the end of a 1-3/4” length screw, then push the hex nut into the front of the spring guide of BackButt until it bottoms out. Unscrew the long screw from the hex nut. Insert the long screw in from the back of the Buttplate and the pin through the BackButt and screw it into the hex nut until tight.
- Page 5 Drive a 4-40 screw into this hole to create a peg for the mag release spring. Hookd one end onto the screw, and the other onto the peg on the magrelease print. Insert a hex nut into each of the sockets in one of the nameplate prints using a hammer. Line up both NamePlate prints with the hole in the side of the Magback print and secure it with a long 10-32 screw.
- Page 6 Use a screwdriver or the outside of a 3/8” socket to force a 10-32 hex nut into the hex socket inside the barrel hole in the MagFront print. Drive a short 10-32 screw into that hex nut from underneath using a flat screwdriver. Only screw it in until the tip of the screw is flush with the opposite face of the hex nut.
- Page 7 secure them. Slide the bolt arms through the slots in the assembly. Push the Ramrod Core into the RamBase print, then secure it with a 4-40 screws from each side. DO NOT OVERTIGHTEN. Add an o-ring to the undercut in the RamBase print, then add the adhesive-backed Shockpad to the back face of the RamBase print.
- Page 8 Use a screwdriver or the outside of a 3/8” socket to force a 10-32 hex nut into the hex socket inside the barrel hole in the Muzzle print. Drive a short 10-32 screw into that hex nut from underneath using a flat screwdriver. Only screw it in until the tip of the screw is flush with the opposite face of the hex nut.
- Page 9 Add an O-ring to the undercut of the PlungerE print, then slide it into the Plunger Tube. Set this assembly aside.
- Page 11 Add an extension spring to the peg on the Sear5 print, then use the print to fish the opposite end of the spring into and through the Grip print. Use an awl or a small flat screwdriver to pull the loop of the extension spring onto the hook inside the Grip5ar print.
- Page 12 Force the Grip Assembly into the U-Channel and up against the back of the Magwell assembly. Use a slotted screwdriver to insert and then force a 4-40 hex standoff into the sockets inside the FrontButt print until it bottoms out in it. Drive a 4-40 screw into the hex standoff from the hole in the side of the print until it pulls the standoff to the bottom of the socket.
- Page 13 Force the remaining U-channel length onto the side of all of the parts in the assembly. Secure it to all four points as shown using 4-40 screws. And optionally at the Coupler print Slide the barrel in through the Muzzle print, DoomS print, and MagFront print until it is flush with the back side of the MagFront print where indicated.
- Page 14 Tap the AFG_Upright print onto the rail of the DoomS print. Force the AFGCore into the window of the AFG_Upright print once the placement lines up with the teeth of the AFGcore print. Force it into place with a hammer until roughly centered. Insert a 10-32 Hex Nut into the slot in the top of the Magfront print.
- Page 15 Slide a 13-inch length threaded rod in through all of the segments and screw it into the Hex Nut inside the slot of the Magfront print. Add a hex nut to the exposed end of the threaded rod and tighten. Install a main spring of your choice.
- Page 16 Insert a magazine into the magwell. If the fit is too tight you may need to loosen the screw that clamps the barrel into the muzzle, then the two that attach the front of the NamePlate prints to the MagFront print. Then retighten once the magazine fit feels correct.