A Step-by-Step Guide on How to Install a Drop-In AR Trigger

You have your new RISE Armament trigger, but how do you install a trigger? It’s a simple process that should take less than 10 minutes. Steps 3 and 4 below will vary if you have another drop-in or cassette-style trigger installed. In that case, you will remove it after step 2 and proceed with step 5.

How to Install a Drop-in Trigger

You will need safety glasses, a brass or nonmetal punch (smaller than .154″), a hammer (we recommend a ball-peen hammer), 5/64 Allen wrench, flathead screwdriver (type of screwdriver may differ depending on rifle manufacturer’s grip screw).

Step 1

Firstly, make sure the weapon is clear and there is not a round in the chamber. Remove the upper receiver from the weapon system.

Step 2

Secondly, loosen the grip screw on the inside of the grip and remove it. It may be a flathead, torx head, or hex head, depending on the manufacturer. Carefully remove the grip to expose the spring inside. There is a detent behind the spring. Both of these are small and easily lost. Remove the spring and detent, using your hand or a plastic bin to catch the detent as it falls. Save them for reinstallation (Step 7).

Step 3

With a small brass punch or nonmetallic item (to avoid damage to the finish), press out the hammer pin and remove the hammer and hammer spring.

Step 4

Next, press out the trigger pin. This may require pressing down on the disconnector. Remove the disconnector, disconnector spring, trigger, and trigger spring. Now remove the safety selector if it did not come out earlier. The pocket that everything was in should now be clear and empty.

Step 5

Drop the RISE Armament trigger in the pocket using the holes as a reference for direction. The hammer will face the magwell.

Step 6

Install anti-walk pins or KNS pins using the accompanying Allen wrenches. Make sure the pin screws are snug, not torqued.

Step 7

Reinstall the safety selector and the grip assembly with the detent, detent spring, grip, and grip screw to their respective positions in that order.

Step 8

(This step does not apply to RISE Armament Rave 140 and RISE Armament Blitz triggers.)

If you have an RA-140 Super Sporting Trigger, LE145 Tactical Trigger, RA-240 or RA-242 Enhanced Rifle Trigger, RA-434 High-Performance Trigger, or RA-535 Advanced Performance Trigger, there are two small setscrews located on the trigger system under the hammer springs. Lift or shift over each hammer spring and use the 5/64 Allen wrench to snug the setscrews to the floor of the receiver. Also, do not overtighten, as this will change the poundage of the trigger.

DO NOT TIGHTEN OR LOOSEN THE MAIN SETSCREW (LOCATED IN THE CENTER). THIS HAS ANOTHER FUNCTION AND IS NOT TO BE CHANGED BY THE OPERATOR.

Step 9

Perform a functions check on the weapon to verify correct installation.

Step 10

Enjoy your RISE Armament trigger!

In case you cannot view the video above, watch the entire trigger installation video on our YouTube page.

Note: The instructions on how to install a trigger are for reference only. Refer to your local gunsmith or dealer for professional installation advice. Using a rifle assembled incorrectly or assembled using incorrect or modified parts can result in a damaged rifle, property damage, personal injury or death. Manufacturer is also not responsible for any injury or damage resulting from the improper installation or use of our products. Always practice gun safety and handle your firearm responsibly. Ensure the gun is unloaded before installing the trigger. Lastly, always point your gun in a safe direction and use extreme caution.

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