The installation is as straight forward and installing any other Remington style trigger. I have used stock Remington triggers, Timney triggers, and on custom benchrest only, Jewell. The most challenging thing is whether or not you want to use a safety. the Navy Mk15 has never used a safety. Keeping the bolt open was the method of "safe." I am sure McMillan can give you advice on compatible triggers that do have long enough safety levers that and be used the McMillan Stock.