WATCH BOTH VIDEOS
The SLG was garbage and the rail operates nothing like the SLG it simply "took its place" at the price point it is offered at.
Take a look at the manuals from both the 2011 rail and the Reflex. You will see they have the same bolt system however the solenoids differ making the base 2011 rail shoot more like an ION and the Reflex like DM but with more kick. Not that its a terrible thing for the base rail, it comes at a great price (esp used), has a UL frame, a fancy eye pipe, and a solid bolt system.
2011 Reflex Rail