Guides
Technical documentation for the MARC family. Free to read, no signup required. All MARC-family products are ATF-determined lawful: one discharge per trigger pull.
M16-Cut BCG Requirement for the MARC: FRD BCG Guide
The MARC and MARC II require an M16-profile bolt carrier group. What that means, why semi-auto carriers won't work, and how to check yours.
FRD Buffer Weight Guide: H1, H2, H3 for the MARC & MARC II
What buffer weight to run with a MARC forced reset trigger: H1/H2 for 16-inch mid-length builds, H2/H3 suppressed, and why it stops light strikes.
Low-Shelf vs High-Shelf Lowers: MARC Fitment & the Fix
The MARC and MARC II drop into low-shelf AR-15 lowers. High-shelf lowers need the Super Safety Kit instead. How to identify your shelf type before you order.
FRD Light Strikes: Diagnosis & Fixes (Bolt Bounce, Auto-Cam)
Light strikes in a MARC build have three documented causes: bolt bounce, auto-cam, and hammer mass. How to tell them apart and fix each, in order.
MARC Won't Fire or Reset in Active Position: Fitting Guide
Step-by-step fitting for two-stage triggers with the MARC: trigger-tail relief, disconnector work, and hammer timing, with function checks at every stage.
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