About the AR15  
 

Builders Report & Manufacture Guide for the Laser Cut

This is where it ends.

 

This is where it begins:  A set of prints is recommended.

  • Double rolled and pickled steel is .063 thick – 4130 Steel yielding a very strong and “rigid” construction needing little or no heat treating on the base receiver.  Rails require heat treating.
  • There will be some oxidation on the surface from a post production practice to allow welding without seam hardening and reduce the potential of seam cracks.
  • Pre-manufacture Preparation: Remove any oxidation with steel wool or emery cloth and wipe with a dry absorbent cloth.

 

After Preparation: A good vice and ‘straight’ hardwood blocks are needed to act as ‘soft’ holding fixtures.

  • Laser Cuts are very straight & interrupted in specific points to allow bending with common tools.
  • Each cut is done at a different angle for maximum geometric strength.
  • Each cut has a ‘pre-softening process’ applied to allow bending without breakage.

Both fixture blocks should be straight, flat and set at 90 degree angles.

Narrow top rails should be done first.

Note: the interior block is cut to the interior dimensions of the receiver

Bending can be done with wood bending fixtures along the laser cuts and soft tools such as a wooden or rubber hammers.

A wooden or metal spacer should be set into the receiver to hold dimension and clamped for welding. “ONE BEAD IS THE RECOMMENDED PROCEDURE” A light series of ‘tack’ can be used to establish dimensional stability 

Ready to weld

Note:  It is better to only weld the top rails first, leaving the bottom edges alone until after the trunnion and tang are both mounted. This will ensure that the final dimensions of the bend fit to them.

Grind clean with orbital sander, wire brush wheel, finish with emery cloth.

The best results seem to come from using button head cap screws. The quality of rivets, rivet tools and individual expertise vary from one builder to another depending on source of supply and equipment.

The button head cap screws are all heat treated alloy steel and the button head allows a high torque over a larger fastening area.

Final clean and coat to preference.

 

 

 

 

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