• Easy to assemble, drop-in design
  • 0 MOA Mil-Spec 1913 scope rail included
  • KeyMod slots on three sides of the forearm
  • Conventional mounting slots on two sides
  • Lightweight
  • Side folder model available (Innovative tumbler-style, side-folder mechanism)
  • Accept all after-market trigger systems
  • Free-floating modular forearm
  • Multi-point radial cut inlet which allows barreld action to sit in stress free for utmost accuracy (no V-block)
  • Will accommodate barrels as thick as the action
  • Designed to accept any AR-15 rifle buttstock and pistol grip
  • Accept MDT and AICS-style magazines in .308 Win. and .223 Rem.
  • Available in side folder model
  • Made in U.S.A.


  • Weight:
    • Standard: 3 lb. 2 oz.
    • Side Folder: 3 lb. 6 oz.
  • Material: Aluminum
  • Finish: Mil-Spec Type III hard coat anodized
  • Length:
    • Overall (Standard): 31.25" - 32.5"
    • Forend: 11.5"
    • Top Rail: 19.69"
  • Length of Pull:
    • Standard: 10.62" to 15.69"
    • Side Folder: 12.35" to 17.25"


  • Remington 700 Short Action - Right Hand


  • 1x AB Arms Fixed-Adjustable Urban Sniper Stock
  • 1x Mod-X Gen III receiver
  • 1x AB Arms SBR P-Grip


If you’d like an easy-to-assemble, drop-in chassis for your Remington 700 short action rifle, you will find that the American Build Arms Company (AB Arms) GEN III MOD-X Modular Rifle System is just the thing.

The Gen 3 MOD-X modular rifle system is lightweight and ergonomically-designed for ease of use. The modular foundation of this chassis enables the user to customize it with tactical accessories suitable for the mission at hand. This system is compatible with .308 Win and .223 Rem MDT and AICS-style magazines.

The handy KeyMod slots of this chassis permit the installation of multiple rail sections for increased functionality. The MOD-X arrives with a AB Arms' Urban Sniper stock and a free-floating forend. Those of you who are patriotic will be happy to know that this product is proudly made in the U.S.A.

About AB Arms:

AB Arms is committed to building “better and stronger” to help support the work of those whose lives are on the line every day. The company’s commitment to high-quality products makes it a trusted name in the military, tactical and hunting worlds. Law enforcement officers, and private security companies depend on AB Arms products when it matters most.

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Reviews (5)

  • Nice upgrade

    Posted by Unknown on 11th Jun 2018

    This stock is a great upgrade for your SA Rem 700. Very east install, takes 20 min. with an inch pound torque screwdriver. The only hard part is finding a 10 and ACIS style magazine in stock>

  • I spoke too soon!

    Posted by Caleb M. on 23rd May 2018

    My action didn’t fit into the chassis and I figured it was a problem on AB Arms side. I emailed AB Arms, and they told me that they were aware of a potential issue with the bolt release — for Rem 700 — being too large to fit into the chassis. So they emailed me back and said they will take care of the issue no problem.

  • Fantastic Chassis

    Posted by David on 12th Mar 2017

    Great chassis and great service by Wing Tactical. Arrived at my home within a couple of days of ordering. The chassis is insanely well machined and everything fits together perfectly. Extremely easy to put together. I have two left hands when it comes to building anything and I was able to knock this out in about half an hour taking my sweet time. One note: make sure you have an INCH POUND torque wrench (not foot pounds!!) and a set of torx head drive bits and allen (hex) head drive bits in your tool kit. The chassis comes with both types of screws and they need to be torqued down properly.

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