what scope would be a good choice for the socom 16 using the rail forward of the receiver ? I would like a 1-4x or something close I have a red dot on it now.
If you are mounting on the front rail you are very limited to scopes that are SCOUT scopes. Leupold makes one and Burris makes one they are both fixed power http://swfa.com/Burris-275x20-Scout-Scope-P2020.aspx http://swfa.com/Leupold-25x28-FX-II-Scout-Scope-P3262.aspx
It's those or a red dot. While some of the pistol scopes will probably work some will not have the right eye relief. If you need more scope than those you are really opening a can of worms because you have to mount off the side of the reciever and need a cheekpiece or there are some custom stocks that will get you there also but not cheap.