The only thing I would check is to make sure the rifle chambers properly in all sorts of weird positions.. Straight up, straight down, on it's sides, upside down, shaking around, etc...
Then, I would make sure to fire it enough that you are sure about clean, easy extraction... No burrs in the chamber, etc...
The most common "Modification" I have heard about is to set it up for 5 rounds in the mag.... Personally - if a guide can get the job done with a double rile (ONLY 2 rounds...) - then 4 in the mag should be enough....
Thanks