Originally Posted by 5teve L
Dave, the breech on the MPR & the S400 are different mate, the MPR barrel is thicker & therefor the breech is machined slightly different ot allow this. (thats my theory) Because as you say the aim points are indeed different, I think with my old mounts the scope to barrel on the MPR was 2" & on my old 400 was 1.75"
A ha , I thought the breech was the same size but have never really checked tbh ? The only difference I was aware of was the thicker barrel which although thicker will be obviously central to the breech , if not I have a duff gun . lol