You have any more reputable source, perhaps something released by Colt themselves? A few minutes of searching on my part has turned up no such thing as a "hammer forged" RE, but I could be wrong.
Personally I only use REs from BCM, Colt, LMT, KAC, DD and VLTOR. Everything else is suspect.
Search "Buffer Tube Basics" as a thread title.
There's absolutely NO REASON to run a Commercial piece of shit. A decent part is only usually $20 more.
Even amongst the "mil spec" REs there's a pecking order. I have some rough ones. REAL Colt REs will have a mirror smooth finish inside that you can actually hear and feel when cycling the charging handle.
Reading the stickied threads at the top of this subforum would have netted this: https://www.m4carbine.net/showthread.php?t=7009
...which contains the thread markm specified, among others that contain answeres to many, many general technical questions.
Between that and Clint's post, this one's pretty well answered. Again. :D