Thanks Chef. Does the extra length the muzzle adds give you more FPS?
Yes, LDC = Lead Dust Collector or shush-stick or quiet tube or any name but the "S" word they don't want us to use.
Search TKO and Neill Clague and others for those "mufflers"
Yes, your trigger will need some more work, it's an iterative process, or many steps and then, many more small steps to get it right. The stock trigger can safely be brought down to about 2.9 lbs pull, after that, reliable cocking and safety is an issue.