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Rise Armament 3.5lb Drop in (Sport) Trigger Only

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Our Price: $122.00
We currently have 1 available.
Item Number: LRPRADIT35
Manufacturer: Rise Armament
Manufacturer Part No: RA-140 SST

Upgrade / Modification Options

Add Trigger / Hammer pin set

Also known as the Black Fallout, the RA-140 SST is a high-performing, cost-effective upgrade to replace mil-spec triggers.

Key Features

  • Single-stage trigger system
  • 3.5-lb. pull weight
  • Clean break with a short reset
  • Black 8625 hardcoat anodized aluminum cassette
  • Comfortable, rounded trigger
  • Unit weight: 2.6 oz.
  • Manufactured and assembled in our facility according to strict AS9100 aerospace requirements, which are more stringent than standard gun manufacturing requirements
  • CNC machined from high-grade, heat-treated tool steel and aluminum
  • Fits most .308 and .223 AR style platforms (Not for use in Sig MPX)
  • Self-contained design makes it easy and quick to install with no fine-tuning needed
  • KNS pins recommended but not required. If you do not use KNS pins, be sure to follow step 8 in the installation instructions linked below.
  • To view installation instructions, watch our tutorial hereor read our tutorial here
  • Note: The set screw should not be tampered with. Any attempts to modify the trigger will void the warranty.
  • U.S. Patent No. 7,293,385

How to Install Your RISE Armament Trigger

Installing your RISE Armament RA-535 Advanced-Performance Trigger is a relatively simple process that should take approximately 10 minutes. Weve demonstrated the process on a standard forged receiver with a milspec trigger. Steps 3 and 4 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.

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 manufacturers grip screw).

Step 1
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
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 re-installation (Step 7).

RISE Armament trigger installation 1 RISE Armament trigger installation 2 RISE Armament trigger installation 3

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.

RISE Armament trigger installation 4  RISE Armament trigger installation 5

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.

RISE Armament trigger installation 6  RISE Armament trigger installation 7

Step 5

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

RISE Armament trigger installation 8  RISE Armament trigger installation 9

Step 6

Install KNS pins by following the instructions on the KNS package (or install your standard pins if you dont have KNS pins). Make sure the KNS screws are snug, not torqued.

RISE Armament trigger installation 10

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.

RISE Armament trigger installation 11

Step 8

This step is optional if youre using KNS pins but required if youre using standard pins. There are two small setscrews located on the trigger system under the hammer springs. Lift or shift over each hammer spring and use a 5/64 Allen wrench to snug the setscrews to the floor of the receiver. Do not overtighten, as this will change the poundage of the trigger. This step is necessary for the weapon to function properly without KNS pins

RISE Armament trigger installation 12

Step 9

Perform a functions check on the weapon to verify correct installation

Step 10

Enjoy your RISE Armament trigger!

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Product Reviews

(12 Ratings, 4 Reviews) Average Rating:
Great trigger at the right price
Alphonso D Johnson (San Diego, CA) 4/27/2016 11:50 AM
I've had this trigger a little over a month. I've did the adjustments using regular trigger and hammer pins and kns anti rotational pins. I've found it to be one of the best triggers out for the price.Both with regular and KNS pins it has worked for me in any lower I have assembled. Great trigger, great price.
No Issues These Triggers Work Just Fine
William Carlton (Fort Worth, TX) 4/22/2016 6:08 PM
Never had not one issue with these trigger. I will continue to use them. Thanks Rise.
2nd time a charm, JSE customer service rocks
Cain Reecer (Woodstock, GA) 4/21/2016 4:20 PM
I got my replacement trigger, and this one functions 100%. The fitment in the receiver is much better also. This is a great trigger, and I'm sure Rise just had a bad batch. JSE took care of the problem right away, and Dawn was quick to respond to questions. The first trigger had issues, but JSE was flawless.
Great trigger
Rick (Boise, ID) 3/16/2016 1:10 PM
I have installed two of this triggers, work great. Short reset, AR shoots like a bolt action.