Picatinny Buffer Tube Adapter

SKU #5206

Availability: In stock




Our new 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.


  • Compatible with multiple platforms
  • Fits any picatinny rail
  • True STANAG mount
  • Includes set screw for carbine buffer tubes
  • Engraved TC logo
  • 304 stainless steel hardware


  • 6061 T6 Aluminum
  • Type III Hard Anodize finish
  • Weight: 2.5 oz.
  • Width 1.37 inches, Height 1.4 inches
  • Install with a 7/32 hex wrench (not included)

Made in USA

It is the responsibility of firearms dealers and private firearms owners to know and fully understand all federal, state, and local firearms laws in their area. Thordsen Customs LLC will not be held liable for any misuse of its products and will assume that our product(s) comply with state and local laws unless otherwise notified by authorities.


Highly Recommended!Review by Loose Cannon
Waited until this was in stock (pretty much checked in everyday). Ordered this for my new Sig MPX Carbine. Fit and finished is top notch and was delivered in just a few days. No play, no wiggle...very strong mount! Highly recommended! (Posted on 9/27/2016)
The best mcx adapterReview by Sigarms664
This is the best sig mcx mpx adapter on the market hands down. (Posted on 6/29/2016)

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