I have a 16" MRP CQB "compliant" from Questar which is the same as your pic but...
fixed SOPMOD stock and no flash hider. (Target Barrel)
a. I'll never shoot this with the stock at full compressed, it feels too unbalanced. Tried it didn't like it.
b. The flash hider would be a very small gain if any.
In my humble first hand experience with the LMT MRP, it is a great choice of AR. But not a perfect choice. <So you may end up with more than one... it is an addiction after all.>
My LMT is more accurate than I'll be for a long time. Very happy with it and I only have a cheapo Bushnell Holosight on it. I do find it front heavy. But the MRP is what it is. An elegant rail system, and the reason I went for that particular platform.
Pointability may be a consideration if you are competing. I don't know 3 gun that well.
I didn't buy it because the cost benefit analysis said it was the best choice.
I bought it because it kept me up at night, and still does.
If I bought a Norinco AR now, after having one of these, I know I wouldn't be so enamored. I believe the term is "spoiled rotten".
It's a 1:7 twist so some ammo like some of the Winchester brand is not recommended. Winchester claims one particular type they sell is not to be used in twists faster than 1:9. (said so right on the box). The LMT will shoot anything I put through it including cheapo Remington UMC.
I have a CMMG .22lr conversion kit and it is plenty accurate also.
The LMT smacks build quality. This is apparent especially in the MRP upper. I have compared it to the HK 416 and can't justify the 1500+ more. (Piston systems don't thrill me - a solution to a non problem as some may say) - But it would also keep me up at night if I had one.
I cried when I paid the invoice. But that pain has long passed and, oddly I still find money for ammo.

You'll burn through that $800 in ammo in a year or less and still not have the MRP to show for it. The firearm is a one time expense, ammo is an operating cost. The "save the money for ammo" argument doesn't work for me. Either you can afford to shoot it or you can't... My gun buddies don't come to my place to caress the tubs of spent .223 casings. They come for the chance to see the LMT. (Haha)
Buy the LMT MRP. Then save up and buy another different AR. I did. Heck who here would say they would only like to have just one AR. That's like asking a hungry kid to eat just one chip or one cookie.
It's just mean!!!!
Good luck!