What lightweight rail for 12.5" barrel build?

[burkew23]

ETA: I noticed that SLR advertises an "anti-rotation and anti-slip system" for their h/g's (which have bottom clamping)...anyone have extended bipod shooting experience with these?

The SLR rail has anti rotation tabs that fit onto the upper reciever. They don't work on some billet uppers like Mega's. I haven't had mine for long but to try an answer your question I twisted the handguard as hard as I could and it twisted slightly before the tabs stopped it by hitting the receiver wall. But this took a lot of force to do and I doubt it'd be possible to twist with bipods.





The last picture is how far it twisted. When I twisted it back it re-centered well.