I’m guessing the suppressor that envelopes the barrel. Saw one the other day that really impressed me. It had a sleeve inside that came out, split into two pieces and then the interior actual suppressing apparatus was a third piece. Can’t imagine anything easier to clean. All told there were six pieces.
Looks like a nice little can. I don't know how many pieces my old Sionics .45 can had, hundreds, I suppose, if you count all the brass boot grommets it used as *random baffles* that most users replaced with a wrapped section of brass screen cloth.
Known in the biz as a Reflex suppressor, as per the Finnish designs of J. Hartikka, pioneered in Europe by BR Tuote.
The one they make for the M107/M87 Barrett .50 rifles is the most effective I've tried, and gives me some interesting thoughts about the 20mm Lahti.