I have a 452 varmint 16" barrel. You mention getting a trigger kit for yours and all I can say is go for it. Did mine a few months ago and it has totally, I mean totally!, transformed it. I used the middle spring from the Rimfire Magic kit. Superbly accurate rifle using Hornady vmax 17gr, head shooting bunnies from quad sticks. I am sure there are better quality hmrs out there but mine is simply a working tool and it does the job brilliantly