After much back breaking labor, I present to you this. Come on man, look around.
I did search for "Long" "Shot", Longshot" and "LS" in modifications before I posted this. That isn't a very good *complete* write-up. Yes, it says how to replace the spring and take out the AR, but Carrtoon (no offense to him) didn't say anything on how he replaced to barrel, what the barrel is, or anything else besides the spring and AR.