For me, the short gas system on a FAL just doesn't make much sense unless you are using a short barrel (which also doesn't make sense to me given the platform). With the 16" barrels the system may shed a tiny amound of weight but it also shortens the sight radius. The trade off just doesn't seem worth it. It doesn't appear to do anything to improve an already proven design.

The rifle I own is not a factory built DSA but a home build on a DSA receiver. The quality of the parts I purchased from them is excellent and I always received good service from them. If I were in the market for a new FAL, DSA would get my business. Another place to look is Arizona Response Systems, although I think he is pretty booked up these days. He offers a workbook and video on the FAL that is worth checking out even if you're not planning on a home build. The FAL files forum is a great site to learn about the FAL. Sadly, it is not nearly as active as it was a few years ago but it is one of the best sources of info on the FAL.

Arizona Response Systems
http://www.arizonaresponsesystems.com/

I picked up parts and tools from Gunthings when I assembled my rifle. Good people to deal with. They also offer some books and manuals on the FAL.

http://www.gunthings.com/