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SIONICS Perimeter Marksman Rifle (PMR) Upper


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SIONICS Perimeter Marksman Rifle (PMR) Upper
SIONICS PMR 18.5" Upper - 5.56mm

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Rerimeter Marksman Rifle Upper (PMR) - Black

  • Configuration: SPR Style Preceision Rifle, 5.56mm NATO
  • Upper Receiver: 7075 M4
  • Barrel: 18.5" Stainless Steel, NATO Chamber, 1:8, Air-Gauged, DPT Inspected
  • Gas System: Rifle-Length, Direct-Impingement
  • Bolt Carrier Group: Nickel PTFE M16 Carrier, Carpenter 158 Steel, HPT/MPI, Shot peened, staked gas key
  • Charging Handle: Mil-spec charging handle included
  • Muzzle Device: SIONICS Muzzle Brake
  • Hand Guard: Free-Float 15" EVO Hand Guard (low profile gas block)

All upper receiver assemblies are test fired by SIONICS.


Barrel Details

  • 416 Stainless Steel
  • 5.56mm NATO Chamber
  • 1:8 Rate of Twist
  • Medium Contour
  • Standard 1/2X28 Muzzle Threading
  • Rifle-Length (12") Gas System
  • Barrel is DPT Inspected
  • Low Profile Gas Block

This is SIONICS premium, stainless steel precision barrel. The slightly heavier profile and design makes this a practical design that is more than capable of sub MOA accuracy. The barrel is 18.5 inches long and uses the standard Rifle Length Gas System - SIONICS found that the extra half of an inch helps provide additional back pressure and dwell time needed to make the rifle 100% reliable, without having to over drill the gas port, or use a mid-length or proprietary gas system.


Bolt & Bolt Carrier Details

  • 100% HPT & MPI
  • Shot Peened
  • Heavy Extractor Spring
  • Black Insert and O-Ring
  • Nickel PTFE Carrier

SIONICS bolts are made by a current defense contractor from Carpenter 158® Steel. The bolts are 100% high pressure tested and magnetic particle inspected. Each bolt is shot peened and comes with a heavy extractor spring, black spring insert and O-Ring.

SIONICS bolt carriers are also manufactured by a current defense contractor. Only M16 bolt carriers are used. The keys are checked for a flat fit before being installed and the bolts are side staked.

Each carrier assembly is treated with a durable Nickel/PTFE plating which creates a permanently lubricious surface which eliminates the need for grease, oil or any wet lubrication.


Additional Information
Manufacturer SIONICS

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