The Orca is a 3D printed AR-15 rifle. The goal of the project was to print as much of the AR-15 
as possible, without compromising the performance.
The following components that would be on a factory AR-15 have been replaced by printed or 
non-firearm parts, or made unnecessary: Upper, lower, handguard, buffer tube, barrel nut, 
stock, grip, takedown pins, buffer retainer, etc.… This list is not exhaustive, but gives the reader 
an idea of the scope of this project.
The handguard and stock are attached to the receivers by tapered clips held in place by hose 
clamps. This system is strong and low profile.
The split line of the upper and lower has been fully redesigned from the simple split on a 
standard AR-15. This has been done to improve the strength of the upper, the upper-lower 
connection, and make the parts easier to print. 
The barrel mount at a minimum should be printed from a high temperature filament, such as 
glass filled Nylon. Preferably the upper and handguard should also be printed from a high temp 
filament. These requirements, and the need for accurate prints that properly fit together, make
this an advanced build. Precede with care. 
Premade support and modifiers are included for convenience. 
With most printers the Orca will require approximately 100 hours of print time.

Huge thanks to Hoffman Tactical for developing this!