A solid rail that upholds the troy industries reputation - Troy SIG 556 BattleRail (Rifle)

This is an excellent rail for the SIG 556. It is certainly better than having to send your rifle to SIG to have a SIG factory rail installed. Although it makes for a very long rail, I like the fact that the top rail is a single piece extending all the way to the rear which insures that front and rear sights will absolutely lie on the same plane.
It should be noted that if you have a factory front sight you will not be able to use it with this rail as it covers the front dovetail. In fact, it comes with a dovetail insert with a threaded hole which secures the top rail portion at the front. If you have the SIG folding stock you will not be able to secure it to the rail as you would with the SIG factory plastic hand guard. These were non-issues for me as I chose to use a Troy folding sight on the front and replaced my factory stock with a side folding adapter for use with a T6 style stock.
This rail will allow you to remove the gas tube while leaving the rail in place. This is a welcome advantage.
The only minor issue I had to deal with was the tensioning screw which is at the front of the bottom rail. It may vary with each individual rifle, but when properly tensioned according to instructions, mine was left with the screw sticking out about an eighth of an inch below the rail. Because of this I had to make a slight modification to my bipod adapter by milling an indentation in it to accommodate the tensioning screw head. This was a only minor issue. It will add some weight to the front of the rifle, but that is to be expected with any tactical rail system.

Having this rail has made a world of difference over the factory plastic hand guards though. The rifle now has a much more solid foundation for accessories such as forward grips, bi-pods, optics and lights as well as sling swivels. The machining and coating are top notch and the fit couldn't be better.