Newtown Firearms’ Infinitely Adjustable Gas Piston System

    Tagged with a name that reminds me of continuously variable automobile transmissions, Newtown Firearms of Siler City, North Carolina have announced an “infinitely adjustable” gas piston operating system:

    Siler City, N.C. – Following their move from Placerville, Cal. to Siler City, N.C., Newtown Firearms has launched the NF-15 S.M.A.A.R.T. System (Superior. Modular. Adjustable. Automatic. Rifle. Technology.), an infinitely adjustable gas piston system for use in all AR-15 platforms.
    With 48-position tuning capabilities, the NF-15 S.M.A.A.R.T. System allows shooters to make adjustments not only for atmospheric conditions but for variances across ammunition suppliers. Using the 48-position adjustable knob, shooters can easily make on-the-fly adjustments to any pressure level within the AR-15 platform producing minimum felt recoil that allows for faster target acquisition while at the same time maintaining all of the typical benefits of a piston driven system, including cooler operating temperatures and easier cleaning.
    Newtown Firearms NF-15 S.M.A.A.R.T. System comes with a Nitromet coating and is compatible in all AR-15 platforms with a medium contour .750 barrel. An upgraded physical vapor deposition (PVD) or diamond-like carbon (DLC) coating is available for those that desire ultimate friction reduction at even lower operating temperatures while increasing the overall performance and lifespan of the NF-15 S.M.A.A.R.T. System.
    NF-15 S.M.A.A.R.T. System
    • Universal gas piston system with one-piece carrier
    • Infinitely adjustable to any pressure level
    • 48-position adjustable knob
    • Available in Nitromet, PVD or DLC coatings
    • Patent No: US 8869674
    The NF-15 S.M.A.A.R.T. System is available through Country Arms, a division of Newtown Firearms, and may be purchased separately or as part of a complete AR-15 rifle by calling (919) 663-0864 or online at

    Newtown Firearms AR-15 with SMAART gas system.


    The title image makes it pretty clear how the system works: The regulator has a tapered extension, and is threaded. As the regulator is screwed in, the tapered segment increasingly interrupts the flow of gas to the short-stroke piston, while a simple spring clip keeps the regulator in position.

    48 positions seems excessive for a gas regulator, though it is possible Newtown Firearms had a specific problem in mind when they designed the SMAART system.

    Nathaniel F

    Nathaniel is a history enthusiast and firearms hobbyist whose primary interest lies in military small arms technological developments beginning with the smokeless powder era. He can be reached via email at [email protected]