Originally Posted by drwindmill
Why do you want to convert? 340 kicks like a mule. You might want to consider adding a brake as well.
I have one with a brake, one without. While I prefer the one with the brake the one without is definitely tolerable - but that may be just me.
Of note, both the 300 and the 340 do better with a 26 inch barrel. If you really want a 340 I'd recommend swapping up to a longer barrel, or better yet swap to a Mark V that already has a 26 inch barrel.