Does anyone have any experience with this Burris?
Burris 200437-FF MTAC Riflescope 1-4X-24mm Ballistic Plex CQ w/ FastFire & Mount
Yes. I ran the Burris XTR on my 16" M4 for competition. If you put me inside of 800 yards, I'll be tagging some targets with that scope. I had some hunting buddies that said there was no way we could shoot that small AR with a 4x scope out to 500 yards. I made sure each one of them had shot multiple rounds on steel at 500 yards with my 1-4 Burris XTR. Then they were believers. The fast fire is for emergency CQB, and that's up to you. I think the fast fire would be good if you ran a higher power scope, and understood the hold off and cant for it. But I only ran the 1-4 scope. I like the true 1x, since I can shoot with both eyes open for CQB targets. This is the main scope I run for Team Sniper matches when I was running the gas gun. It was easy for targets inside 400 yards. I used the BDC reticle for my holds. Don't worry about lining up the reticle to exactly the bullet and speed for the drop. They hardly ever match up any way. I ran (at the time) a Hornady 68 grain BTHP. It shot flatter than the reticle subtensions, but I just held slightly less and knew where each hold was. Once you get it and find a load that shoots good in your rifle, zero it, and take it out to each yardage point to figure out the drop. Once you know this, and hold for any wind, you can get on target very easily.
I also have a SS 3-9 mil/mil FFP scope for my 300 blk out that I like. I use this more for hunting and dialing elevation, though.
Don't think you NEED the extra magnification. 4X is plenty if you know how to use it. The 1-4X gives you more speed to acquire targets and engage them faster. There is less precision on 4x than a 20x scope, for sure, at long range. But you have to balance what you want the scope to do. Are you getting it for long range precision, or fast target recognition and engagement. That's a question only you can answer. That's why I have multiple scopes for different applications. But don't feel you can not make hits with a 1-4 power scope at longer ranges. Come spend an hour or so with me (or FiremanJG) at his gun range, and you'll understand, too. It is very possible.