BUBAR10 AR308 Details

The BUBAR10 is a 3D printable LR308-style lower receiver that has taken the firearms world by storm. It is a modified version of the UBAR, but with a twist – it uses simple hardware store metal parts to reinforce the lower.

These reinforcements solve the major design concerns that printed AR lowers face, making the BUBAR-10 a solid option for printable 308 lowers. At the core of the BUBAR-10’s design are simple yet effective reinforcements, including a U-Bolt to clamp the buffer tower down, two humps to spread bending force at the rear of the receiver, and two eye bolts to act as the front takedown lugs on the lower.

These enhancements greatly enhance the strength and durability of the lower, making it able to withstand pushup tests, drops, throws, kicks, and other hard abuse.

If you’re looking for a reliable and more high-powered 3D-printed firearm, the BUBAR-10 is definitely worth considering.

BUBAR10 AR308 in the Wild

Photos

BUBAR 10bubar10 308 riflebubar19 lower 3d printedbubar10 ar10 3dbubar10 308 lower receiver 3d

Video

BUBAR10 3D printed AR10 lower in slow motion.

Featuring some amazing trigger slap, the CMC trigger break is excellent but reset isn’t really tangible especially given how much AR10s jump around. pic.twitter.com/WRhfaXRobG
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Welp the Komodaru is still cool, but the tree-ohhh-ate yeeted it. Pressure wave is pretty damn violent.

(Gat is a 3d printed .308 AR10 upper and lower)

Komodaru by @RICECUTTA0
Animal Farm upper by @Co_op1776
BUBAR10 lower by @NaviGoBoom
Wafflemag by @Spooky3DPG pic.twitter.com/d2UhlTo6ZV
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BUBAR10 AR308 Tech Specs

The Bubar10 AR308 is a 3D printable lower receiver designed to be used with LR308-style uppers.

However, the AR10 platform lacks proper standardization, with two prevailing specs (LR308 and Armalite spec) that vary from one manufacturer to the next. The rifle’s design is based on the PSA AR-10 uppers, but outside of those, fitting or purchasing additional parts may be required.

The Bubar10 AR308 is designed to use carbine buffer tubes/buffers only, as the U-Bolt reinforcement doesn’t work well with the shorter threaded section on rifle gas tubes. The firearm is compatible with any length upper/gas system as long as a carbine buffer and spring are used.

The Bubar10 AR308 has been tested with standard PMAGs, which seem to be compatible across the board.

Required Parts for the BUBAR10 AR308

Prerequisites

  • Filament
  • 3D Printer
  • AR10 Complete Upper
  • AR10 Lower Parts Kit
  • AR15 Stock
  • AR10 Buffer & Buffer Spring

Hardware

  • U-Bolt
  • 2 x Rod-End Eye Bolts
  • 1x 9/32” OD 1/4” ID Brass Bushing, 0.745”
  • 1x 9/32” OD 1/4” ID Brass Bushing, 0.495”
  • Extended Length Front & Rear Takedown Pins

Tools

  • Drill bits 1/4″, 5/32″, 3/8″
  • Dremel Tool
  • Dremel Cutoff Wheel
  • 1/4 x 28″ Tap
  • Needle Nosed Pliers

Suggested 3D Printed BUBAR10 AR308 Settings

SettingValue
Walls8
Nozzle0.4 mm
Layer Height0.15 mm
Tempreture230 F / 60 C
Infill Density100%
SupportsOn / Full
Support TypeTree
Bed AdhesionGluestick / Hairspray

Filament

  • PLA+ (eSun, Polymaker Pro or stronger)

Looking to make your local boomer at the gun range s*** their pants? The BUBAR10 AR308 is guaranteed to leave a mark (or several).