Guides
Will it work, and how do I tune it?
Check your trigger, then set your buffer for your exact build.
Before you buyTrigger compatibilityEvery AR-15 trigger we have checked with the MARC and MARC II: drop-in, needs fitting, or not compatible, and where to buy it.
Make it run rightAR-15 FRD Tuning GuidePick your caliber, barrel, gas system and can. Get the buffer to start with, plus fixes for light strikes, reset and lock-back.
Watch
MARC and MARC II installation
Full install, start to finish.
9mm blowback AR with the MARC
What a 9mm blowback build needs: 10 oz minimum buffer, no spacer in a carbine tube.
Question these don't answer? Email team@copperheadsafety.com with your trigger, BCG and caliber.