These instructions will help replace an old AR-15 Trigger with a upgraded JARD AR-15 Top Adjustable Single Stage Trigger. 

Supplies:

  • JARD AR-15 Top Adjustable Single Stage Trigger with either the weighted hammer or speed hammer (Instructions will remain the same)
  • 1/16" Hex Key Ball Nose
  • 5/64" Hex Key
  • 3/16" Hex Key (Long)
  • Break Cleaner
  • Loctite
  • 3/32" Punch
  • Hammer

1. Make sure the gun is unloaded and remove the magazine. Then remove the take down pins to separate the upper and lower assemblies of the gun. 

2. Using a 3/16" hex key (long) remove the pistol grip from the gun and also remove the safety detent and the detent spring. 

3. Remove the safety from the lower. Then, using a 3/32" punch and a hammer remove the trigger and hammer pins from the lower. his will allow the removal of the old trigger system. 

4. Using a 1/16" hex key ball nose
and a 5/64" hex key remove all the screws in the JARD trigger system. Then clean with break cleaner, dry and then apply loctite to all screws to be used on the new JARD trigger assembly. 

5. Reassemble the new JARD trigger assembly. Turn the three screws with a 1/16" hex key ball nose until the screws are flush with the bottom of the part. 

6. Hold the trigger assembly upside down and set the trigger return spring into the spring pocket on the bottom side of the trigger assembly. With the trigger assembly upside down, lower the receiver onto the trigger assembly and install the original trigger pin into the receiver with a hammer and 3/32" punch. 

7. With a 1/16” hex key, adjust the over travel set screw so the
hammer misses the sear edge while trigger is held in the fire position. (The hammer will need to be removed to access this screw and may need to be readjusted).

8. Install the new hammer and hammer spring into the receiver. Make sure the spring is on top of the trigger pin as shown in the picture. Using a hammer and 3/32" punch install the original hammer pin. Make sure the pins are facing the same direction. 

9. Place the hammer in the cocked position. With the 1/16” hex key, turn the sear engagement screw until the sear disconnects from the hammer. Then back off the screw about 7/8 turn for safety precautions. 

10. While the trigger is in the cocked position, turn the disconnect screw using a 5/64" hex key, so when in the cocked position you can push down on the hammer and feel it brush against the hook of the disconnect as much as possible without hooking.

11. Install safety back into the lower receiver. Turn the safety so the flat portion is facing to the front of the lower receiver. The safety in this position allows access to the safety adjustment screw. With a 1/16” hex key, adjust the screw counterclockwise so there is NO movement of the trigger in the safety position, but still allowing for sear hammer disconnect in the fire position. (The safety detent, spring, and pistol grip may need to be slid into position to make the safety lever to track in the correct position)

12. Insert pin keeper plate on the inside of lower receiver, and push down the plate until the slots completely seat onto the grooves on the trigger and hammer pins. as shown in the picture. Make sure that pins are facing the same way. 

13. Reinstall the safety detent and safety detent spring into the given hole. Then reinstall the pistol grip into the reciever with a 3/16" hex key (long)