Ordnance Research 607 Rifle Stock

The Colt 607 stock is a unique, early collapsible buttstock for the Colt Model 607 carbine, which was a precursor to later CAR-15 models. It is a proprietary, non-standard design that is shorter than a full-length stock and features a lever on the rear to adjust its length. These early stocks are complex and were eventually replaced by more practical telescoping stocks found on later carbines.

• Collapsing design: It was Colt's first attempt at a carbine stock that could extend and collapse to reduce the overall length of the weapon.
• Proprietary design: It is a unique, non-standard part that differs from the later, more common telescoping stocks found on CAR-15 models.
• Length adjustment: The stock could be adjusted by a lever located on the rear buttplate, and it reduced the total length by about 2.7 inches.
• Functions the same as the original
  
• Improved Design: Has been slightly modified so lower does not need drilled/pinned