AR-15 Lower Receiver Parts Kit with RISE Armament RA-434 Drop-In Trigger (GZMS15LPK-RA434-2)

$ 214.94

Rise RA-140 Trigger

This lower receiver parts kit comes with everything you need to build and complete your stripped AR-15 lower receiver. All parts are made in the U.S.A. to meet or exceed standard military specifications. Kit includes the RA-434 HPT High Performance 3.5 lb pull drop in trigger by Rise Armament.

This kit includes all of the following:  

  • RISE Armament RA-434 High Performance Trigger (HPT) - 3.5 lb
  • Anti-Walk Pins - Buyer's Choice: Armaspec Stainless Anti-Walk AR Trigger & Hammer Pins X2 OR Elftmann Tactical Anti-Walk Trigger & Hammer Pins
  • A2 Style Pistol Grip with Checkering, Deeply Grooved Back Strap and Finger Ledge
  • Flat Mil-Spec Trigger Guard
  • Steel Trigger Guard Roll Pin/Coil
  • Steel Takedown Pin - Nitride Finish
  • Steel Pivot Pin - Nitride Finish
  • Takedown/Pivot Pin Detent X2
  • Takedown/Pivot Pin Detent Spring X2
  • Steel Selector/Safety Switch - Nitride Finish
  • Selector/Safety Detent
  • Selector/Safety Detent Spring
  • Buffer Retaining Detent - Nitride Finish
  • Buffer Retaining Detent Spring
  • Steel Bolt Release - Nitride Finish
  • Steel Bolt Release Plunger - Nitride Finish
  • Bolt Release Plunger Spring
  • Steel Bolt Release Roll Pin/Coil
  • Steel Magazine Catch - Nitride Finish
  • Magazine Catch Spring
  • Steel Magazine Release Button - Nitride Finish

Why the RISE Armament RA-434 HPT High Performance Trigger Upgrade?

That's easy! The accuracy-enhancing RA-434 High-Performance Trigger uniquely combines smoothness and speed for a serious upgrade in performance. The first of its kind, the RA-434 HPT is a premium trigger available at a mid-range cost.
The RA-434 is a high-performing, easy to install, easy to maintain, single-stage precision drop-in AR trigger making it the perfect replacement for gritty, heavy mil-spec AR triggers. Precision CNC machined in the United States from high-grade tool steel and aerospace grade aluminum according to strict AS9100 Aerospace requirements with all internal components finished in a slick, durable and self lubricating Fail Zero EXO nickel boron coating. The RA-434 features a 'Katana' style straight blade trigger for shooter comfort, a "glass break" clean break and very short reset. 
The self-contained design of the RA-434 makes it easy to install without the need for a gunsmith and with no fine-tuning needed. A great trigger is one of the best upgrades you can do to your AR style rifle or pistol and the Rise Armament RA-434 HPT High Performance Trigger is by far the best value drop-in performance trigger on the market today.
  • Single-stage trigger system
  • Helps you shoot more accurately with less effort
  • Ultra smooth to the break with a crisp, clean release
  • Quick reset and low overtravel for serious speed
  • Friction-reducing premium nickel boron coating on interior parts for smoother contact surfaces
  • Lightened trigger pull (3.5-lb. pull weight)
  • Lightened hammer
  • Straight "Katana" style trigger blade for enhanced control and lighter-feeling pull weight
  • Drop safety feature
  • Self-contained design makes it easy and quick to install with no fine-tuning needed
  • Unit weight: 2.4 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
  • Black 8625 hardcoat anodized aluminum cassette housing
  • Fits most .308 and .223 AR style platforms
  • To view installation instructions, read tutorial here
  • Rise Armament products are backed by a lifetime guarantee. If you have any issues with a RISE Armament product, please email RISE Customer Care at
  • 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

Want to know what separates Rise Armament from everyone else out there? Check out this interview by The Shooter's Mindset of Rise Armament's former President, and our friend, Chris Barger: