MasterPiece Arms (MPA) has introduced a new product line, the MPA Rapid Adjustment Technology (RAT) System. This system enables MPA Chassis users to quickly adjust bipod, tripod and barricade stops on the fly. The RAT system is composed of the Base, Harris Adaptor, Dovetail Adaptor Plate, Picatinny Rail Adaptor and Magnetospeed System.
Coming in at a svelte one pound, the lightweight RAT Base (MSRP $70) can attach a variety of accessories to the 1.5″ Dovetail Cut on the MPA BA Chassis System. A pocket is machined into the bottom that includes holes designed to accept a series of accessories that will attach to the Base, allowing the shooter to utilize the RAT System. It attaches to the RAT Dovetail Adaptor Plate mounted to the MPA Spigot Mount. Additionally, an Atlas Bipod can also mount directly to the RAT Base.
The RAT Dovetail Adaptor Plate (MSRP $30) attaches to the Spigot Mount on the MPA BA Chassis System and allows the shooter to run the RAT System and all the accessories on both the chassis body and the Spigot Mount. It’s also needed to run the Magnetospeed Adaptor on the MPA BA Chassis. Installation consists of simply removing the existing Picatinny rail from the Spigot Mount, and attaching the RAT Dovetail Adaptor Plate.
The RAT Harris Adaptor (MSRP $90) provides an attachment method for the Harris Bipod to the 1.5″ Dovetail Cut on the MPA BA Chassis System, and also the RAT Dovetail Plate (Spigot Mount). It is designed to replace the sling stud attachment plate on a Harris Bipod.
The RAT Picatinny Rail Adaptor (MSRP $90) is designed to provide an attachment method for items that interface with a Picatinny rail. This connects to the 1.5” Dovetail Cut on the MPA BA Chassis System, as well as the RAT Dovetail Plate (Spigot Mount).
The RAT Magnetospeed Adaptor (MSRP $90) is designed to provide an attachment method of a Magnetospeed V2 or V3 to the RAT Dovetail Adaptor Plate (Spigot Mount) on the MPA BA Chassis. Shooters can attach the Magnetospeed to the rifle without contacting the barrel. This eliminates any point of impact shift concerns when the shooter is gathering data on velocity. The system includes the RAT Base, Magnetospeed Adaptor Block, and attachment rod and thumb wheel. A Spigot Mount and RAT Dovetail Adaptor Plate are required to attach to the chassis.
New: MasterPiece Arms Rapid Adjustment Technology
More like this from around the NRA
Latest
Eric Harvey Goes Back-to-Back at Gator Cup, Edmunds Takes Lady Crown
Eric Harvey wins his second consecutive Gator Cup Main Event HOA with 183/200. Desi Edmunds claims Lady HOA as Winchester and White Flyer competitors sweep top titles.
A Tornado, a Target Mix-Up and Triumphant Returns: 1992 National Matches
The 1992 National Matches at Camp Perry featured tornado evacuations, a historic target mix-up and dominant performances by Lozoya, Wigger and Bernosky.
Benelli’s ‘Art of Performance’ Series Goes Inside the Making of a Lupo Barrel
First video in Benelli USA’s new “Art of Performance” series showcases the three-step barrel engineering process in its Lupo bolt-action rifle.
Parcell, Powell Lead Team Remington’s Podium Run at 2026 Gator Cup
Brandon Powell finishes HOA runner-up and Turner Parcell takes third in the Main Event at the 2026 Gator Cup.
2026 NRA National Smallbore Rifle Championship Preview
The NRA National Smallbore Rifle Championship returns to Ohio’s Cardinal Shooting Center in 2026 with expanded junior programs, major sponsor support and three national titles at stake.
Cartridge Case Materials Explained: Brass, Steel, Aluminum and Nickel-Plated Brass
A breakdown of four common cartridge case materials—brass, steel, aluminum and nickel-plated brass—covering cost, performance, reloadability and identification.
Interests
SECTIONS
IN THE SPOTLIGHT
EXPLORE MORE NRA PUBLICATIONS
