Save your money {$80 to $125} buy a tube of JB Weld for $8.75. Get a great trigger and a glass bedding job for about 15 mins labour on the trigger and a hour or so glass bedding.
Take the time to look at how the sear surfaces interact with each other and go from there. I've done at least 25 trigger jobs on the MK11 and no problems or returns in the past 3 years.