I enjoy shooting my AR15, however the bolt gets very hot and cleaning it even after only 40rds is like clean a gas station toilet. I need to hear from those that have owned and or operated a PWS MK116 mod 1-m complete upper. My gut feeling is that it will give me everything my FN CHF chrome lined 18" barrel with drilled and pinned Giessele gas block and handguard give me without the heat and the dirty BCG. The PWS is about $999 but my current upper is about $780 without a BCG and charging handle. I am not concerned about losing 2 inches in barrel length. I do not like cleaning the toilet. Thanks for your comments