ESR Rimfire 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 8 to 10 weeks to build this rifle

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The ESR Rimfire Rifle is a combination of our ESR Competition Chassis along with an MPA/Curtis Action chambered for rimfire applications.

Available in a multitude of barrel profiles and muzzle threads, the rifle is setup specifically for PRS/NRL rimfire competitions.

The rifle will come standard with an ATS Barrel Tuner, along with a custom thread protector.

Because this rifle uses a standard Curtis Short Action “Action”, it can be converted over to a center fire rifle with the purchase of a centerfire bolt, barrel and magazine.

The barrel will use barrel nut system, giving the shooter the ability to adjust headspace, which can vary depending on the ammo being used by the shooter.

The chamber in this rifle is setup to run both Lapua/SK ammo and  Eley ammo (different rim thicknesses) with similar bullet profiles. We also have the ability to chamber the rifle in other configurations based on the ammo you prefer to run. Please reach out with any questions.

We will also offer this rifle in either 1:12 or 1:16 twist rate. Lets us know if you need help in determining the correct twist rate for your application.


  • MPA/Curtis Short Action
  • Curtis Rimfire Bolt
  • 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)
  • 40 MOA Scope Rail
  • Quick Release Firing Pin Assembly Removal System (Tool Less)
  • Bolt: One Piece Design of the Bolt, Lugs and Handle
  • Spiral Fluting
  • DLC Coated
  • Dual Claw Extractors
  • Custom Ejector Plate


  • 416RQ Stainless Steel
  • Precision Gun Drilled, Reamed and Honed
  • Pull Button Rifled
  • Stress Relieved
  • Polished
  • 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
  • 1:12 or 1:16 Twist Rate
  • Variety of Chamber specs available
  • Barrel Nut System
  • MPA Custom Heavy Barrel Profile

Chassis System:

  • Masterpiece Arms ESR Chassis
  • Magwell Plate System Ready – Mag Blocker Plate Included
  • Produced from 6061 Aluminum
  • V-Bedding System with Additional clearance for Glass Bedding Action and Straight Section of Barrel
  • 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
  • EVG Grip
  • Thumb Notch
  • R.A.T. System Compatible

Barrel Tuner:

  • ATS Barrel Tuner


  • MPA Elite Trigger (Bix n Andy Tac Sport Pro Custom)
  • Pull Weight: 4 oz-2 lbs

Rifle Case:

  • Plano Basic Rifle Case


  • Vudoo Rimfire Polymer 10 Round


  • Total Rifle Weight (12.9 lbs with 23″ Custom Heavy Profile Barrel – Does Not Include Ammo, Bipod, Magazine or Optic)
  • Barrel: 416R Stainless Steel, Handlapped
  • Action: MPA/Curtis
  • Chamber: Zero Runout Chambering Method
  • Brake: Not Included
  • Chassis Type: ESR
  • Chassis Colors: Multiple
  • Chassis Material: 6061 Aluminum Billet
  • Chassis Coating: H Series Cerakote
  • Magazine: Vudoo 10 Round Polymer Rimfire Magazine
  • Chassis Weight: 5.4 lbs
  • Barrel Profile: Custom Heavy
  • Barrel Length: Varies
  • Trigger Type: MPA Elite (Bix n Andy Tacsport Pro Custom) (4 oz – 2 lbs)
  • Adjustable Length of Pull: 13.5-14.5″
  • Cheek Riser: Adjustable
  • Recoil Plate: Adjustable for Height and Cant
  • ATS Barrel Tuner