PK Firearms Logo

Your home for AR-15 parts & accessories!

PK Firearms Logo

Rock River Arms Fred Eichler Predator Upper

$599.00
SKU: 
4158

Rock River Arms Fred Eichler Predator Upper

Caliber: .223 Wylde

Upper: Forged A4

Barrel: 16 inch Stainless Steel, 1X8 Twist, Cryo Treated

Muzzle: Tuned and Ported RRA Muzzle Break

Charging Handle: BCM Gunfighter Mod 4

Handguard: RRA Fred Eichler Series Free Float



Rock River Arms 18 Inch - Varmint A4 Upper

$629.00
SKU: 
4280

The Rock River Arms 18 Inch - Varmint A4 upper features a Rock River Arms 18 Inch stainless steel, air gauged, cryo-treated bull barrel chambered in .223 Wylde with a 1:8 twist and rifle length gas system.  Built on a Rock River Arms forged A4 flattop receiver with a Rock River Arms TRO-MID handguard and a .936 low profile gas block.



FM-9 11″ Elite Model Quick Change Barrel

$289.00
SKU: 
4339

11″ barrel
9mm
Made from 4150 chromoly steel.
QPQ nitride finish.
Includes A2 flash hider and carry handle.



MCR 12.5" Adjustable Heavy Barrel

$623.00
SKU: 
4350

Complete barrel assembly for use with MCR® rifles and upper receiver assemblies. Includes barrel extension with fixed headspace, gas block assembly, 4 position regulator, piston, flash hider and dovetail cover. 100% Made In USA.



MCR Quick-Change Barrel Handle Assembly

$120.00
SKU: 
4351

Permits safe and easy handling of hot Quick-Change Barrels! Fits all models of MCR®, Shrike 5.56™ and military AMG-2.



MCR Charging Handle Assembly

$226.00
SKU: 
4352

Fits in belt-fed MCR® upper receiver assemblies with serial number MCR-1000 or higher.
Machined from 7075-T6 aerospace grade aluminum billet.
Folding handle for compact storage and snag free use.
Hard Coat Anodized per Mil-A-8625F, Type III, Class 2.
Made In USA



MCR Extended Bolt Catch

$63.00
SKU: 
4353

Fits in a mil-spec AR15/M4/M16 lower receiver. For use with MCR® upper receiver assemblies, provides the necessary clearance for the wider MCR® upper receiver. Made In USA.



MCR Magazine Adapter

$140.00
SKU: 
4354

Plugs into standard magazine well and permits mounting of linked ammo containers to the weapon. Fits all models of MCR®, Shrike 5.56™ and military AMG-2.


Pages