That sounds like exactly what I want! Does your SR2 have a 3.78 action opening too? Does the 3.85 mag work without altering the action? And what brand bottom metal and magazine did you use? Sorry for all the questions, Feenix, I'm just excited and doing my due diligence. I just was unaware if the 3.85 magazine would fit in the 3.78 hole in the bottom of the action. Is this due to the 3.85 mag length counting the flange or something that sits below the action, and the top part of the magazine slightly smaller to fit the hole? Thank you so much for your help sir!
This may chill your excitement a bit but take a deep breath and think about this for a minute. Do you really think a 3.85" magazine is going to fit into a 3.78" cut out? And do you really believe a magazine with a 3.85" external dimension is going to be made from .0035" thick material have a 3.843" internal dimension?
I suspect the correct numbers are .035" thick material and a 3.78" internal dimension. I also suspect you will have to machine the cutout in your receiver longer.