Hello there,
    I am currently trying to install troys mid length delta rail on my sig m400 rifle. The bottom rail will not align correctly in the delta rail. When I turn it left or right it will click in but the rail is off about 1/4"

If anyone has any suggestions I am open. Been at it for about 2 hours now.

Thanks in advance,
Dan

Answer found.

After writing my post common sense kicked in. I tried seating the lower piece into the delta ring and it was 1/4" off still but from there I took my rubber mallet and gently tapped the lower rail till it lined up. Kept the brackets semi loose as I tapped on the upper piece. After I got it lined up I tightened the brackets and am very happy with the piece. Hope this helps anyone who is troubleshooting