I'm going to be buying an M4 upper (Colt) to use in building a pre-ban M4Gery. I have the choice of either a PWA or Oly lower, both like new. I've decided to include one of the rail setups, but have not decided which. Right now, Knight's RAS is leading, and am considering the FF version. Is it worth the extra $$ for the FF version?? Also considering the ARMS setup, but have not seen a price yet. I'll probably go for the Knight's for the sake of keeping it as close to the real SOPMOD as possible. This gun is going to be pricy, especially after buying optics and all the other goodies. Right now, the rail is the first step after buying the upper so I'm doin my homework now.
Also, who has the best deals on new Knight's stuff(or the ARMS IRS for that matter)?
One last question: Do the commercially available Colt M4A3 uppers have the rail numbering?
Open for comments and Thanks in advance!!!