B-Variant Hardware Kit

(2 customer reviews)


Contains all the hardware needed to assemble a B-Variant (a design by Steven Rupp). Darts, magazines and printed parts sold separately.

Coming Soon
Coming Soon
Aluminum Trigger (+$15.00)
U Channel Coloring
SCAR Hardware
Rubber Grip Sleeve (+$10.00)
Black Anodize (+$13.00)
Carbon Fiber Wrap (+$15.00)
New Anodize Colors Coming soon
SCAR (+$8.00)
BCAR (+$18.00)
Product total
Options total
Grand total


– Contains all hardware needed to assemble a B-Variant Caliburn, designed by Steven Rupp, based off of the U-Caliburn by CaptainSlug.
– Assembly instructions provided by us by assembly video and step-by-step.
– Default barrel is 14” length 0.527″ ID barrel
– Compatible with Caliburn springs and Pro-series Turf springs
– Hardware differs slightly from U Caliburn such as length of threaded rods and holes in U-Channels.
– If ordered with 509 or 495 barrel, will include chambered barrel receiving end
– Kit includes aluminum ramcore with o-ring notch and skinny-pusher
– Compatible with original B-Variant files linked on Thingiverse
– Base STL files are also included with hardware kit

Assembly Guide: B Variant Build Guide

Optional Add-ons:
– Additional springs can be purchased here
– SCAR Barrel
– Ported MuzzleBrake
– Varying barrel types
– and more!

Darts & Magazines: 
– Compatible with full length darts & elite style magazines
– Compatible with half darts & short-dart Magazines with 

Access to files for printing your own parts available here: Print Files Download

Additional information

Weight 2 lbs
Dimensions 28 × 4 × 4 in

2 reviews for B-Variant Hardware Kit

  1. Patrick O’Connor (verified owner)

    The hardware kit is great. I at first ordered the heavy spring but broke the charging bolt so decided to order the stock spring. I got it together and it would catch when I cocked the bolt but wouldn’t release. ended up breaking the grip. switchted that to PETG and printed the stock 2.0 with the bigger catch. just finished printing that and will soon reassemble. I guess you could say I’m still working out some bugs but very happy with the kit and looking forward to getting it working. Very optomistic.

  2. Kevin Mason (verified owner)

    I would say that the kit, video and help have been 5 star for sure. You guys got me what I was after and got back to me in a timely fashion. Helped me with everything I needed

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