I also did this mod because unless you've modded the barrel to be air tight with the firing barrel you're gonna loose distance.
i appologise for the lack of descriptive photos, but it's a reasonably simple idea an im sure you can figure out anything i've been vague on.
you'll need the following:
a CS-6 stock
the attachable flick up sight (i got mine from the cs6)
NOTE: please see additional photo if you're confused about the last two items.
Step 1: Lets do this! cutting this bad boy short
wow this is hard, i hope you're still following with me.