AR-15 Lower Build And Trigger | Rise Armament RA-100

Published on October 6, 2025
Duration: 1:53

This video details the assembly of an AR-15 lower receiver, highlighting the installation of various components including an Armspec captured buffer system, B5 furniture, an Anderson milspec lower, and a Rise Armament lower parts kit. The primary focus is on the Rise Armament RA-100 trigger, with shooting impressions emphasizing its short reset and lighter brake compared to standard milspec triggers.

Quick Summary

The Rise Armament RA-100 trigger in this AR-15 lower build offers a very short and crisp reset, along with a lighter brake than standard milspec triggers. Its design provides a distinct wall for trigger preparation, enhancing aiming stability.

Chapters

  1. 00:00Lower Build Component Overview
  2. 00:30Shooting Impressions & Trigger Feel
  3. 00:48Trigger Reset Analysis
  4. 01:04Trigger Break and Wall
  5. 01:14Comparison to Dirty Bird Trigger
  6. 01:25Trigger Prep and Wall
  7. 01:39Milspec Design Reliability

Frequently Asked Questions

What are the key components of this AR-15 lower build?

This AR-15 lower build features an Armspec captured buffer and buffer tube, B5 furniture, an Anderson milspec lower receiver, a Rise Armament safety, a Rise Armament lower parts kit, and the Rise Armament RA-100 trigger.

How does the Rise Armament RA-100 trigger perform?

The Rise Armament RA-100 trigger is noted for its very short and crisp reset. It also has a lighter brake than standard milspec triggers and provides a nice wall for trigger preparation.

What is the advantage of the RA-100 trigger's design for shooters?

The RA-100 trigger's design, with its distinct wall before the break, is beneficial for shooters who prep their trigger as they come up to aim, providing a solid point to land on.

Is the milspec design of the AR-15 lower reliable?

Yes, the video states that the milspec design of the AR-15 lower receiver is a proven and reliable design, meaning users don't have to worry about its fundamental dependability.

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