MPA Matrix/Matrix Pro Rifle


Masterpiece Arms builds World Class Rifles. We start with our industry leading Chassis System, utilize the Best Actions and Triggers produced, and our MPA/Spencer 416R Handlapped Barrels provide some the best shooting, most accurate rifles in existence. Designed, Built and Enhanced by Long Range Shooters and Hunters, our Rifles fulfill the needs of the most discerning shooters.


Please allow 22 to 24 weeks for this rifle build to be completed

SKU: MPA65BA-2-1 Category: Tags: , ,

MPA Matrix Rifle

The MPA Matrix Rifle is the flagship of our long range precision product line. It includes the most technically advanced long range precision rifle chassis ever produced. The barrel is produced by MPA using handlapped and air gaged 416R stainless, produced with a zero runout chamber. Its truly a hand built Masterpiece.  Available in the following calibers:

  • Caliber – Customers Choice (6BR, 6BRA, 6 Dasher, 6XC, 6GT, 6×47 Lapua, 6.5 Creedmoor, 6.5×47 Lapua, 6.5 PRC, 308 WIn, 300 Win Mag, 300PRC, 300 Norma, 338 Lapua). If your preferred caliber is not shown on this list, please contact MPA.
  • Magazine – AICS or AW Mag Compatible. (10 Round AICS Compatible Magazine Included for Short Action Calibers, 5 Round for Long Action Calibers)

This rifle is available with either the Matrix or Matrix Pro Chassis.



  • Total Rifle Weight (16 lbs with 26″ MPA Match contour Barrel in Matrix chassis – Does Not Include Ammo, Bipod, Magazine or Optic)
  • Barrel: 416R Stainless Steel, Handlapped
  • Action: Impact 737R
  • Chamber: Zero Runout Chambering Method
  • Brake: MPA DN3 Muzzle Brake
  • Chassis Type: Matrix
  • Chassis Material: 6061 Aluminum Billet
  • Chassis Coating: H Series Cerakote
  • Magazine: Accurate Mag 10 Round (308) Magazine
  • Chassis Weight: 6.2 lbs
  • Barrel Profile (Standard) MPA Match (Many other Profiles Available)
  • Barrel Length: Varies per Customer request
  • Trigger Type: MPA Trigger (Bix n Andy) (4 oz – 2 lbs)
  • Adjustable Length of Pull: 13.5-14.5″
  • Cheek Riser: Adjustable
  • Recoil Plate: Adjustable for Height and Cant
  • Glass Bedding is an Option


  • Curtis Valor or Impact 737
  • Wire EDM Bolt Lug Raceways
  • 3 Lug Head (2 Head on Impact)
  • 60 Degree Bolt Throw (90 Degree on Impact)
  • Rollerball tipped cocking piece to reduce drag (Standard Cocking Piece on Impact)
  • 20 MOA Scope Rail
  • Quick Release Firing Pin Assembly Removal System (Tool Less)
  • Recoil Lugs Ground to .0001″ Flatness and Parallelism
  • Bolt: One Piece Design of the Bolt, Lugs and Handle
  • Spiral Fluting on all Bolts
  • All Bolts are Hand Lapped and Fitted to each individual action
  • DLC Coated
  • Mini 16 Extractor


  • 416RQ Stainless Steel
  • Precision Gun Drilled, Reamed and Honed
  • Pull Button Rifled
  • Stress Relieved
  • Hand Lapped
  • Bore and Land Inspected on Video Borescope
  • Sheffield Air Gage Inspection to .0001″ on Bore and Rifle Land Variation
  • Chamber is indicated within .0001″ or less – to the bore of the rifle

Chassis System:

  • Masterpiece Arms Matrix
  • Produced from 6061 Aluminum
  • V-Bedding System with Additional clearance for Glass Bedding Action and Straight Section of Barrel
  • MPA Matrix with Adjustable Cheek Riser, Length of Pull
  • Built In Bag Rider with Butthook
  • Night Vision Bridge
  • V4 Spigot Mount (Pic Rail and Arca Swiss Rail)
  • Cerakote Finish – Multiple Colors Available
  • Built In Inclinometer leveling system
  • Multiple Vertical and Angled Grip Options (6) or Matrix EVG Grip
  • Thumb Notch
  • Trigger Finger Supports (4)
  • Thumb Shelfs (3)
  • R.A.T. System Compatible

Muzzle Brake:

  • MPA DN3 Muzzle Brake
  • Direct Thread Attachment, User index-able (5/8-24 TPI)


  • MPA Trigger (Bix n Andy Tacsport Pro)
  • Pull Weight: 4 oz-2 lbs


  • 3/8″ MOA or greater

Rifle Case:

  • Plano Basic Rifle Case