Lilja makes a 17hm2 drop in barrel. Isn't cheap, but the folks on rimfirecental say that it fills out the barrel channel on the american quite nicely.
I'm a huge Lilja fan, I have several of their barrels, but wow, they want both my arms and legs plus to buy one. I think I can make my own cheaper and accuracy should be on par with Lilja. We will see.
I tire of seeing guys on youtube that brag about how accurate their CZ457's are, then later you find out they have rebarreled their rifles with a Lilja. I know I've said it before, but it's irritating. Both pursuit of accuracy, and Dan from rimfireSS tout their lilja barreled rifles. I'd just as soon shoot my factory barreled Savage MK2, if you have to pay as much for the barrel as you did the rifle. Just doesn't make any sense to me. I'm hoping your rifle shoots lights out, without having to go through that insanity..
