Pack Wolf....Max Plus pressure problems in the AR, especially with the .204 cartridge can show up in several points of the action...Most significantly of concern is the locking lugs on the bolt...While you may get by with limited use, the lugs have the ability to develop stress cracks and shear off, allowing the bolt carrier group to shatter...the most common though would be for the case to rupture in the chamber...Either event can be injurious, if not deadly, to the shooter and bystanders...
If you have a copy of the Sierra load data, you will find they specify completely different loads for the AR as opposed to bolt action and other types of firearms and you would be wise to keep your loads withing reasonable AR specifications...
I shoot both AR and Bolt rifles in the .204 and .223, I never allow the reloaded ammunition developed for the Bolt to be shot in the AR...