I have one of the first batch of BFGs sold.
The original brake (harmonica type) could be pretty tough on you, but the new 'shark' brake works extremely well!
The Armalite brake rated higher in some FCSA tests, but at the cost of more back blast.
I think the Serbu at 25lbs is a very good compromise between weight and portability for a full-sized rifle.
With good ammo, it shoots sub moa, but does take some practice to become accustomed to the ~4lb trigger and felt recoil is still a bit more than a bench rifle like the AR-50
The mag fed version has been demonstrated by Mark, but I don't think it's in regular production yet.
In the past he has indicated that it would be possible to retrofit the magazine at additional cost when it does become a featured item. I believe his production emphasis is still in catching up on backorders from the CA ban fallout and ramping up for production of the (magfed) semi-auto BFG.
I do also have an UltraMag50 upper conversion that has the side feed magazine.
I don't find that the weight of the 3rnd mag adds significantly to the heft or balance of the rifle.
The biggest factor to me, was the forward weight of the barrel (22") which I now plan to have fluted.
Anzio Ironworks does currently offer a magfed (from the bottom) and it's basic design is based on the Serbu as well.
UltraMag50 Report