For Xtreme what is the correct sholder to back end spec.?

[riooso]

For the Extreme what should be the measurement from the very back of the barrel to the shoulder just in front of the threads. I got a barrel with the gun and it is 1.261". I have been having some problems with the module not being tight and was wondering. On my DYE barrel I measured 1.249". I would like the
module a little tighter what should I go to?


R