It is not just a bleed hole that detunes (many of) these rifles- the struts are also weaker (less pressure). Alot of people have made this claim, but when they actually put in the proper strut they find their original assumption (or instructions heard from other people on the internet) is somewhat wrong- plugging the hole alone raises the power, but not to its maximum output.

The kit with all the proper parts is available now: http://scopesandammo.com/storefront/...pair-kit-p-837