Free: Contests & Raffles.
Get a gen 2 Midwest rail. They are on sale on ebay threw a lot of vendors. I just picked one up for one of the current projects. Super light/looks great/ won't break the bank.I really like Midwest/troy/seekins
The key-Mods are the way to go. Slim & light! You don't have to deal with all the unnecessary rails and you add rails only where you need them.