I finally got my tax stamp for my suppressor, picked it up about three weeks ago. ordered adapters for 1/2x28, 1/2x36 and 5/8x24 so i could use it on my 9mm rifle, 22, 223, and 308. but then I wanted to be able to use it on some of my older rifles and would need to get the barrels threaded. checked and it would cost about $125.00 for each. checked out youtube found a place called CNC warrior who sales annular cutters,(that can be used in a hand drill) to cut down the O.D. of the barrel for 1/2x28, 1/2x36 and others for threading plus many other tools. the cost was $102.00 for my order as I already had a 1/2x28 Die. so i received my 1/2x28 thread protector yesterday and decided to use it on the oldest .22 rifle I had, a Marlin model 25 .22 I got as a Christmas present when I was 12, it has always shot very well for an inexpensive rifle. so I cut the barrel O.D. down and threaded it last night and wanted to see if it effected the accuracy. seem's to shoot just fine.