Looking hard at another FAL. Need some help from you fine folks. Looking at DSA's 1) They offer an STG model and a SA model, one is from mostly parts and one is new(ish) production, I assume the STG's are the parts guns given the price? 2) Who makes the barrels and are they chrome lined, STG/SA? 3) I have an STG with the 18" barrel and I am thinking about the 16" PARA with the longer gas system, I have read some posts by people that say they think the short gas system is too short, would you agree with this? does this opinion apply to the longer gas'ed 16" model as well? 4) Plan A) is to get a 16" longer gas system PARA model and run a low magnification optic, and put some higher power glass on the 18" STG. Plan B) is to convert the 18" to a PARA and go low power again, and get a 21" STG for higher power glass. Which would you do A or B? Thanks for the help.