Valid points, all. Cost is a major consideration, as you generally own it for life. Yes, it can currently be sold to another party down the road, trust or individual, but re-sale value is usually about half of purchase price.

I think the primary reason for welding VS user servicable is the pressures that the cans deal with. .22LR is low pressure, so is 9mm-.45ACP, relatively, when compared to rifle caliber cans, which is why you see more pistol and .22LR cans that are serviceable.

Having a user serviceable can "let go" is a lot more likely if the pressures are high, like on a .300 win Mag, .30-06 or .308, as I would imagine the threading of the caps and cylinder would need to be extremely high quality, and probably of fairly heavy material when compared to a welded can. (a lot of welded cans are actually threaded, and then have the connection welded, making that transition nearly as strong as a solid cylinder) I'm not a machinist, so your insights on this would be very valuable.

The .45 can I just bought is also a draft horse, not a thoroughbred. It is user serviceable, easily adaptable across a number of platforms (including my .458 SOCOM using sub sonics) by just screwing in a different thread adapter to the booster, and again it isn't the lightest or quietest, but it will get the job done that I bought it for. When I get possession of it, I'll meet up with you again so that you can see how is comes apart, and what the inards look like.

Last time I checked, I am not an operator, nor am I a member of Seal Team 6. I have the need to take out pests on my property quietly from time to time, and that is about it.

Both you and I were surprised by the exit hole in that can, 0.375" if I remember correctly. Lots of play for a .308 can. The question becomes just how quiet can you get your can? Shooting full boat 6.8 or .308, regardless of how much it deals with the muzzle blast, you will still have the supersonic crack. Subsonics from a custom bolt gun, and a longer integral/slip-over/threaded suppressor, now that could get pretty quiet. Your limitations would be weight, and length.

I think you would be a perfect candidate to build your own form 1. I have an acquaintance who has built a number of them with just a simple milling machine, all form 1.

Takes a lot to get me butt hurt.