I fired my first one from the prone position on the exp. range at Shrivenham and it was filmed on high speed video to get the recoil and recuperation in slow motion. The problem was that it showed my face flinching in anticipation of what I'd expected the recoil to be. But it wasn't as bad as I expected and fired it a few more times. Let my young son have a go on one against an old Ferret hard target on the field firing range. He was standing in the fire trench with a small-arms school Sgt/supervisor. He winced a bit first time but it didn't bother him after that.
We had one at the small weapon collection at the Base Ord Depot Ngaruawahia and the blokes running the big ammo dump there found a load of unknown and unrecognised ammo for the Boys. The Boss, Jock Annandale couldn't find a suitable field firing range locally so we couldn't shoot it off. And he wasn't going to let us use it on the new 25yard Armourers test range!