This is a good on/off in the fact that it works well and also vents went turned off. The bad thing is that due to the design, there is no adjustability in the rail what so ever. You cannot move the ASA forward or back, which is really the purpose of a rail. Consider this a direct mount ASA if you buy it. The other negative thing is that it is not interchangeable with any other ASA/rails. The rail/ASA design is not standard.
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ST Rail and On/Off
July 15, 2012
Reviewer:
Joseph Holt
from Chicago, IL United States
I have always trusted Shocktech and this time is no exception. Fabulous quality and beautifully anodized. I recomend this product to all who need an asa and or a rail.
Good with flaws 
ST Rail and On/Off