I keep a Thunderbeast 22TD on my 457 all the time. I love it. I have not noticed any issues with POI shift but then again, I don't take it off. I haven't noticed any accuracy issues but keep in mind I am not the most fundamentally sound shooter out there. I'm just barely sub moa (IE .4xx at 50 yards).
I LOVE the sound reduction. Basically, you hear the firing pin drop and then the ping down range with standard velocity ammo.
As for thread specs, I found no issues with the factory barrel. I did run into a small issue with my Bartlein. It was threaded at an AR-15 thread spec. They did take care of me though with no issues. Just be careful if you are buying a Bartlein drop in from someone other than them directly. Double check thread spec to make sure.
I LOVE the sound reduction. Basically, you hear the firing pin drop and then the ping down range with standard velocity ammo.
As for thread specs, I found no issues with the factory barrel. I did run into a small issue with my Bartlein. It was threaded at an AR-15 thread spec. They did take care of me though with no issues. Just be careful if you are buying a Bartlein drop in from someone other than them directly. Double check thread spec to make sure.