I go to ace for parts. Need a single oddball metric machine screw? Yea we got that. Need a proprietary plastic nut for a toilet tank canister? Got that too. Need a bit of an oddball size filter for your HVAC? We got 15 from 3 different brands.
Otherwise my wife shops the clearance section.
The MRAD is really underwhelming. Never touched, much less seen a TRG. Handled a few AI rifles. Own a Desert Tech. I would go AI if I was doing it over again.
That said, Mile High and Euro Optic are the 2 retailers that keep the majority of those in stock. If you've got cash in hand, I would...
Put whatever parts on there. It will be done incorrectly. Get it appraised with someone who has auto body experience. They will write up all the problems. Present to insurance. You will either get the proper diminished value amount and a questionable front end or they will buy the car and you...
The SRS holds its own with the likes of AI and other custom guns. If they did anything, it was make a QD barrel stable and accurate. That carries over to the MDR. That said, the most accurate barrels aren't factory. ES tactical spins up mean DT barrels
If they paid for insurance. It's target sports problem. If they didn't, it's targets sports problem. Either way, dispute the charge with your credit card company. God speed