Putting an FRT in a .308 Sig Spear! And the MPX, Rattler & Virtus! All of them!

Published on June 13, 2025
Duration: 8:59

This video details the installation and testing of Frankenstein Armory's Forced Reset Triggers (FRTs) across various Sig Sauer platforms, including the Spear .308, MPX, Rattler, and Virtus. It highlights the 'Heavy' and 'Lite' trip bar variants tailored for specific models and calibers, emphasizing improved reliability over competitors. The content also touches on the legal status of FRTs and their operational mechanics.

Quick Summary

Frankenstein Armory provides 'Heavy' trip bars for Sig Spear .308/.277 Fury and 'Lite' bars for MPX, Rattler, Virtus, and Spear LT. Testing showed good reliability in 5.56/.308, with some 9mm inconsistency. Their design avoids competitor's fitment issues.

Chapters

  1. 00:00Sig Spear .308 FRT Shooting
  2. 01:49Frankenstein Armory Trip Bars Intro
  3. 02:40Platform Reliability Issues Discussed
  4. 03:09FRT Legal Status Explained
  5. 03:33Lite vs. Heavy Trip Bar Variants
  6. 04:31Competitor Comparison (Midnight Machine)
  7. 05:16Caliber Reliability Results
  8. 06:09Shooting Demonstrations

Frequently Asked Questions

What are the different types of Frankenstein Armory trip bars?

Frankenstein Armory offers two main types of trip bars: 'Heavy' bars designed for the Sig Spear in .308 and .277 Fury calibers, and 'Lite' bars suitable for the MPX, Rattler, Virtus, and Spear LT models.

Are Forced Reset Triggers (FRTs) considered machine guns?

No, FRTs are not legally classified as machine guns because they require a distinct trigger pull for each round fired. There have been legal victories affirming this distinction against federal regulations.

How reliable are FRTs in different Sig Sauer calibers?

Based on testing, 5.56 and .308 calibers demonstrated very solid reliability with FRTs. The 9mm caliber, specifically in the MPX platform, showed some inconsistency that might be linked to magazine generation.

What advantages does Frankenstein Armory offer over competitors?

Frankenstein Armory emphasizes a direct fitment design for their trip bars, aiming to eliminate the need for manual modifications that some users report with competitor products like those from Midnight Machine.

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