MasterPiece Arms Side Rails – For Matrix / ESR Chassis – Black

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Original price was: $179.99.Current price is: $159.99.

Competition Side Rails, designed for the Matrix or ESR Chassis, provide enhanced stability when shooting “positional” in PRS or NRL Style competitions.

Adds approximately 75% more width to the bottom of the fore-end, making the rifle more stable when shooting off positional bags.  The radius section on the bottom of the rails provides a more comfortable grip of the fore-end when moving and changing positions.

The side rails are compatible with MPA weight tuning system and the Gray Ops CNC Side Rail Weights made specifically for the ESR/Matrix Comp Side Rails, available for purchase separately.

System includes:

  • Left and right side rail
  • 8 “M-lok Nuts”
  • 8 fasteners for attaching the rails to the nuts
  • 8 fasteners for attaching to the MPA Internal Weight System.

Compatible only with the Matrix & ESR chassis

Cerakoted black. Other cerakote options, available for an upcharge, include: FDE, Mil Spec OD Green, Gunmetal, Tungsten, Midnight Bronze, NRA Blue, and USMC Red. Please contact MPA if you want a custom color not listed, including Gun Candy.

See below for compatibility with various arca clamp products:

  • MPA RAT Clamp & RAT Accessories – Compatible
  • Area 419 Knob type Arcalock Clamp – Compatible
  • GrayOps Mini Plate Pro – Compatible
  • GrayOps Mag Cut Mini Plate – Not Compatible
  • GrayOps Amp Elite Multi Plate – Compatible
  • GrayOps Arca Rail Clamp – Throw Lever Style – Compatible
  • Area 419 Harris Bipod Arca Clamp Kit – Compatible
  • Really Right Stuff BTC-Pro Clamp – Not Compatible
  • Really Right Stuff EVO-CA Throw Lever Clamp – Compatible
  • Really Right Stuff SC-LR Throw Lever Clamp – Compatible
  • Really Right Stuff HC-Pro Clamp for Harris Bipod – Not Compatible
  • Cyke Pod Bipods – Compatible
  • Cruxord Arca Clamp Tripods – Compatible
  • Leofoto Acra Throw Lever Clamp Tripods – Compatible
  • RRS Arca Throw Lever Clamp Tripods – Compatible

To summarize, most, if not all, throw lever clamps will work with our Comp Side Rails. Most Knob/Thumb Wheel Type Clamps will not function properly.

Availability: In stock

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Additional information


Black, Midnight Burnt Bronze, Flat Dark Earth, Gun Metal, Marine Red, NRA Blue, Multi-Cam Dark Green, Tungsten, Solstice, Ingot, Surge

Non Folder / Folder

Folding Stock, Non-Folding Stock


700LA RH, Tikka RH/LH, 700LA LH, 700SA RH, 700SA LH

Shopping Cart
MasterPiece Arms Side Rails – For Matrix / ESR Chassis – Black
Original price was: $179.99.Current price is: $159.99.

Availability: In stock

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