I have mine shooting completely stock since day one. No leaks and decent groups when I shoot off of a bag. Once I shoot off hand my groups open up so I know I am the problem. I like this little pistol; it is a ball to shoot being both light and decent accuracy. I don't think that for the price there is a better pistol (fun factor) to be had .
Why not just use a pull string?But if you do want to remove it, yes remove the nut at the muzzle end of the barrel. Use snap ring pliers or a small pair of needle nose pliers. Some have improvised by clamping a couple of small hex keys or nails in a vise. Once the nut is removed, the barrel shroud will slide off. Then unthread the barrel from the receiver.
V2 got here today. I was able to test fit it tonight without the O-ring. Plenty of clearance to fit the end cap. V1 on the left:Almost finished hogging out the stock reg. Tomorrow I gotta get that 15.5x1.5 O-ring and then it's off to the FT match, er..races.