I built this one in 1999. 10" long silencer old design. Old school captured perforated tube . Its a first year Mark II I picked up at a pawn shop for $159. I machined the barrel down to 3 inches and slimmed down the front section and machined a full length tube with 3/16" perforations down to the end. It uses rolled up vent screen aluminum mesh material for packing. It's very quiet even by modern standards with no FRP whatsoever. The packing lasts maybe 100 rounds before replacing the material. Ive thought about redoing it with modern dynamic baffles instead of what is basically a WW2 era design but it works and its pretty accurate and to be honest I am impressed with the quality of my 20th century machine work whenever I clock the front sight and it lines up every time.. I do need to find a bang flag for it.