Kopfjäger Reaper Rail for Pictatinny/ARCA Swiss Manual (KJ86004 & KJ86005)
REAPER RAIL UPPER ASSEMBLY (ARCA SWISS AND PICATINNY):
The Reaper Rail Upper Assembly is designed as a replacement part to replace the top end of your existing
Reaper Rail, switch between Arca Swiss and Picatinny, or as an accessory to quickly and easily transform
your Reaper Grip into a Reaper Rail. The Reaper Rail anchors your firearm to the rail adapter installed
on your firearm. The Reaper Grip maximizes proper shooting techniques outside of the supported
prone position. Note: Make sure the Reaper Rail Upper Assembly you have purchased matches the rail
section installed on your firearm. The Reaper Rail system is not interchangeable between Arca Swiss and
Using a 5/32” Allen wrench, remove the four Allen-head mounting screws from that fasten the direct
mount plate to the top of the saddle clamp. Align the screw holes on the Reaper Rail Upper Assembly with the holes in the top of the saddle clamp. Insert the four mounting screws and tighten.
SECURING A STOCK OR CHASSIS IN THE REAPER RAIL:
To secure a stock or chassis in the Reaper Rail, set the firearm’s Arca Swiss or Picatinny rail section into
the rail clamp and tighten the tension knob located on the side of the clamp until the firearm is secure.
The Reaper Rail includes cant adjustment. In long-range shooting cant affects point-of-impact (POI); in fact, more extreme angles of cant, as well as longer distance shooting, especially extreme distances, produces significant POI shift—just 1° of cant may result in a 6” POI shift at 1,000 yards. For this reason, the Reaper Rail includes 22° of cant adjustment (11° in each direction). For proper cant adjustment, you should have a cant indicator (most often a bubble level attachment) correctly attached to your stock, optic mount or the optic itself. To adjust cant, loosen the cant adjustment knob. Rotate your firearm clockwise (right) or counterclockwise (left) on the cant swivel until your cant indicator bubble is centered. Holding the rifle steady, tighten the cant adjustment knob. Check for cant again and adjust if necessary. You may also choose to shoot with the cant adjustment knob slightly loosened to allow for on-the-fly cant adjustments.
Before handling the Reaper Rail, read and understand the contents of your bipod’s manual, and the
Kopfjäger Reaper Rail manual. Follow all standard safety precautions and procedures during use.
• Never leave a loaded firearm in the rest without having positive physical control over the shooting
• Do not exceed the tripod’s maximum load capacity.
• Ensure the Reaper Rail is fastened.
• Always remove camera, spotting scopes and other accessories during setup or transport.
• Please use standard lubricant or grease when necessary
If you have any additional questions or concerns, please contact our Technical Support team by calling 817.587.6149 or fill out a Contact Us form here.