This is a great and low cost option for connecting an AR Buffer tube to our T/C grips with rail interface.

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From Thordsen:

Our ORIGINAL Picatinny Buffer Tube Adapter is a great addition to your Sig MPX, Sig MCX, Sig P556XI, Rock River PDS, or any other pistol that utilizes a rear vertical picatinny rail. It gives a shooter the ability to add a cheek rest for greater stability or a stock for SBR conversions (federal tax stamp required).

The mounting method follows true STANAG (NATO Standard Agreement) protocol using the two back angles and the top of the rail as the contact points. The result is perfect alignment with the centerline of the firearm. A feature that is not attainable with typical side clamping adapters. Another bonus is that there are no visible fasteners or holes on the top and sides of the adapter for a clean sleek look.