Re: TRG 42??
Talk to Steve at Triad Tactical. He has a ton of Eagle bags. I have a TRG-22 with the 26" barrel and it fits into most any standard rifle bag. I think you only run into problems if you want to leave a suppressor attached or have a barrel of 30" or greater.
I use a London Bridge Drag Bag, but I purchased it directly from their store in Virginia Beach when I was stationed in Norfolk. For them, if anything ever failed they would fix it for free and they were 5 minutes away. It's a good bag, but it doesn't have a lot of the features some of the pricier models have. For what I use it for, it works satisfactorily and didn't break the bank.
Oh, and great choice on the rifle. You might want a tube sock or tissues handy when you first mess with the trigger...it's that good.
Josh