I have an sb2 s# nm2127## handi rifle.I called customer service to see if an 500sw,444m, and a 450m could be fitted ? The reply was it could as long as it was a sb2 handi . I called back later and got another person asked the same question? I got the same reply.I made them check the serial # they said Ok. I then asked them if said barrels were in stock. The reply was "to the best of my knowledge". I then asked how much a trigger job was,"all we do is disassemble the trigger clean it and coat it with a dry lube you can do this Yourself we do not stone or change any spring pressure and highly recommend you do not". The reason for this post is to ask ? This information does not make sense with what i read @ FAQ regarding s# and what i have read about the factory trigger job. Any info on this would be a great help thank you