brett1868 wrote:I've seen things screwed to the ends of 22's which are called "adjusters" but can't say I know their precise function. I assume they're an aid to acuracy rather than silencers. My PWS Summit 22lr has a threaded barrel and it's a bit of a pita having to check the cap is tight on a regular basis so I don't lose it. I'd love the factory "moderator" for my DTA but I doubt I'd ever be able to get a permit for one. Not sure why there's such a problem with sound moderators, makes perfect sense to protect hearing by using them.
you'd be thinking of barrel tuners. by screwing the tuner in or out you can "tune" the barrel to suit your ammo (can be used on any rifle, rimfire or centerfire)
you can tune the barrel harmonics so that the bullet leaves the barrel with the barrel as the barrel is on the way up, this means that a load of average velocity will shoot to your point of aim while a slower moving bullet will be in the barrel longer, "throwing" it higher, then a faster moving bullet will leave the barrel sooner, shooting it lower. with proper tuning all three bullets will have the same point of impact at a given distance (the distance you have tuned the rifle for)
it's really interesting stuff and one of about 30 things a few blokes talk about that mostly goes over my head
Chronos