I like the Fortis rail. From looking at their line they seem to be going for very lightweight products! I was thinking about the Fortis rail, but I'm not going to building any more Ars for the time being....hopefully I'll be too busy shooting them. I like the aggressive looks, the light weight and build int qd slots for slings. You will have to watch out tho, because its lightweight design, and big slots will make it heat up quickly, but conversely it should cool down fast too.
I am not sure but you may need a new barrel nut for the Fortis rail.
I am sure that you will need a new gas block if you plan to use it. YHM makes a great low cost product, I got mine for $35 on sale. (over a year ago) Make sure you get a spare roll pin for your gas tube while you are at it!
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