Instruct: Classify Amazon reviews into positive or negative sentiment
Query: good rail

This rail works great on the bottom of my Stag Model 1, carbine sized hand guard. It doesn't cover the entire length of the carbine rail, which is good for what I wanted. I have it positioned all the way forward so there is still a little space available at the back of the hand guard where I can position my hand. There is some play with the rail when you are tightening the screws, so make sure you center it best you can when finishing up those last few turns on the screws, don't want it to slide out to the side and be too off.