I don't want to hijack this Urban thread but since I am having some of the same choices as this Urban I will explain. The main difference I have with most other situations is I shoot with helium. My first test shots were with two different 14.8 grain pellets and I was getting anywhere from 1,350-1401 fps, so the sonic crack made it sound more like a .22 LR. At that speed I am not going to get anything close to the accuracy with a diable pellet that I am looking for. Yesterday I got some 25.39 grain Jumbo Monsters delivered and it got it down into the sub sonic range (shooting out my kitchen door into the back yard) but my chrony is at a different location so i don't know the speed. I also don't know if it will be accurate yet but I also have some 30 grain slugs on the way. If I can't get a decent group with slugs or the monsters then I might get a LW un-choked barrel for shooting slugs. In that situation I might thread the barrel to take the emperor without the shroud. I can get the .063 od barrel and that should be stout enough to handle the weight of the emperor especially if I have a barrel band for support, not free floated. So stay tuned, I'll be going today where I can try the monsters with the chrony and see how good they do. I really want them to do well in the stock barrel so I don't have to re barrel but I love to tinker so it may be inevitable. If I do get a LW un-choked then I can go full out power mods, shoot slugs and not have to worry about accuracy, the faster the better. So, with the helium filled to 3000 psi and the monsters, even though it is now sub sonic, it was still far from dead silent with the factory shroud. The Marauders now come stock with a factory installed de-pinger.