M-K IIA1 AR-15 Trigger Systems


The Original  M-K IIA1 AR-15 Two Stage National Match Trigger

Large pin Colt rifles models are  available

SKU: N/A Categories: , Product ID: 34


The M-K IIA1 description

The Original 2-Stage AR-15 Trigger. The first and still one of the best. Over 25 years old and still competing and winning in National Matches today. With the transferable lifetime warranty they will still be winning in the future.

If old school is not what your looking for try the latest version of the M-K II trigger the World record setting M-K X.

When installed and tuned the M-K II A1 will give the user the crisp, clean and predictable release that is unmatched to this day.

Available in: Standard Pin, Standard Pin with The Bronze Advantage, Large Pin Colt.


  • Original long reset disconnector allows extra forward trigger movement on reset.
  • Requires some hand fitting to install, just like the old days.
  • User fits the overtravel to the desired distance by trimming the tail of the trigger housing.
  • Standard Pin(i.e. Mil-spec) size 0.155 receiver pins
  • Large Pin Colt (i.e. Mil-spec) size 0.170 receiver pins
  • When Installing the M-K II Large Pin in Colt models with a sear block it is NOT necessary to remove the sear block or modify the receiver in any way.