Proof Research Elevation FDX MTR - PXT Technology 7mm PRC Rifle 20" Barrel - Splinter Camo

Proof Research Elevation FDX MTR - PXT Technology 7mm PRC Rifle 20" Barrel
Splinter Camo

Designated the Mountain Technical Rifle, the MTR FDX was engineered specifically to bridge the gap between a precision tactical platform and a lightweight backcountry hunting rifle — delivering a hybrid system that performs with equal authority on a 1,000-yard range and at 11,000 feet in the middle of an elk hunt. The Splinter camouflage carbon fiber MTR stock features a slightly raised comb and near-vertical grip designed around natural shooting position geometry — promoting a more consistent cheekweld, improved eye-to-scope alignment, and better rifle control in the varied positions that mountain hunting and field precision shooting demand. It is a stock that thinks like a tactical chassis and feels like it belongs in the backcountry — because it was designed to do both.

Like the FDX before it, the MTR FDX is built around the TriggerTech trigger, Hawkins Precision M5 Hunter bottom metal, 3-round detachable Hunter magazine, and the Salmon River Solutions SRS Combo Rail — delivering simultaneous ARCA and Picatinny interface compatibility for the full spectrum of field and range support equipment. A 20 MOA pinned base rail and 5/8-24 threaded muzzle with thread protector complete a platform that is optics-ready, suppressor-ready, and field-ready from the moment it leaves the box.

But the FDX's defining story is told in its barrel — and that story begins not on a rifle range, but on an Apache helicopter.

PROOF Research's PXT technology traces its origins to a U.S. military contract for M230 cannon barrels — a program that forced PROOF's engineers to fundamentally rethink everything conventional wisdom assumed about rifling geometry, twist progression, and barrel manufacturing. When military small arms development began pushing chamber pressures toward 80,000 psi — well beyond the standard 62,000 psi — it became clear that materials and coatings alone could not solve the barrel longevity and accuracy challenge. The physics at the point of bullet engagement had to change.

In a conventional barrel, the bullet abruptly engages rifling at roughly a 6° angle, begins rotating at full speed within the first quarter inch of travel, creates a sharp pressure spike, and accelerates wear in the first two inches of the bore. PXT reduces that engagement angle by approximately 95–98% — beginning twist rates as gradual as 1:250 to 1:500 at the breech before progressively accelerating through the bore. Combined with a proprietary smoother-edged rifling profile that reduces bullet engraving force by approximately 30%, the result is a barrel system that spreads throat erosion across dramatically more of the bore, handles higher pressures without accelerated wear, and delivers 30–100% increases in barrel life before measurable accuracy degradation — with 20–50% repeatable reductions in group sizes observed in controlled testing across multiple ammunition types and lot variations.

This is the barrel technology that began in a military cannon program, evolved through the highest levels of small arms development, and now sits at the heart of a 5-pound mountain hunting rifle ready to change what you expect from a precision platform in the backcountry.

PROOF Research PXT Carbon Fiber Barrel — Military-Derived Rifling Technology
PROOF's PXT (Progressive Twist) technology originated from a U.S. military M230 cannon barrel contract and was further developed for small arms platforms pushing chamber pressures to 80,000 psi. By reducing rifling lead angle approximately 95–98% and implementing a proprietary smoother-edged rifling profile that cuts bullet engraving force by 30%, PXT dramatically slows throat erosion, spreads wear across more of the bore, and delivers 30–100% increases in barrel life before measurable accuracy degradation compared to conventional barrels.

20–50% Repeatable Group Size Reductions — Controlled Testing Verified
Across multiple ammunition types and lot variations, PXT barrels have demonstrated consistent 20–50% reductions in group sizes in controlled testing — a direct result of reduced sensitivity to bullet jump and powder charge variation produced by PXT's gradual, progressive rifling engagement geometry.

Sendero Contour Carbon Fiber Barrel
The Sendero contour carbon fiber barrel combines the stiffness and harmonic stability of a heavy-contour profile with the dramatic weight savings of carbon fiber wrapping.

Falkor Defense LW7 Action
A precision-machined, lightweight action purpose-built for the demands of backcountry precision shooting.

TriggerTech Trigger
Frictionless Release Technology delivers a zero-creep, zero-travel trigger break that is mechanically distinct from conventional sear-based designs.

Salmon River Solutions SRS Combo Rail
The SRS Combo Rail provides both ARCA swiss and Picatinny interface compatibility in a single forearm rail system — giving FDX shooters the flexibility to run modern ARCA-compatible tripods and Picatinny bipods.

Hawkins Precision M5 Hunter Bottom Metal with 3-Round DBM
The M5 Hunter bottom metal delivers a rock-solid, precisely fitted magazine interface in a streamlined mountain-optimized package.

Splinter Camouflage Carbon Fiber Stock
The 100% carbon fiber stock provides a rigid, dimensionally stable chassis that eliminates bedding shift and flex under field conditions, while the Splinter camouflage finish delivers effective pattern disruption in mountain and mixed-terrain environments.

20 MOA Pinned Base Rail
A factory-installed 20 MOA cant rail provides built-in elevation bias for extended long-range shooting.

Specifications

• Caliber: 7mm PRC
• Barrel Length: 20 Inches
• Barrel Contour: Sendero
• Barrel Technology: PROOF Research PXT — "Progressive Twist Rifling"
• Barrel Material: Carbon Fiber with Stainless Steel Liner
• Twist Rate: 1:8
• Action: Falkor Defense LW7
• Trigger: TriggerTech
• Bottom Metal: Hawkins Precision M5 Hunter
• Magazine Type: Detachable Box Magazine (DBM) — 3 Round
• Stock Material: Carbon Fiber
• Stock Color: Splinter Camouflage
• Stock Features: Integrated Flush Cups
• Length of Pull: 13 5/8 Inches
• Forearm Rail: Salmon River Solutions SRS Combo Rail — ARCA and Picatinny
• Base Rail: 20 MOA Pinned
• Muzzle: 5/8-24 Threaded and Finished with Thread Protector
• Weight: 5 lbs 14 oz – 6 lbs 8 oz