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Special Operations Upgrade Kit for M4, M16 & AR15

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SKU: Special Operations Kit Category: Tag:


The Special Operations kit is made to provide you the right products for special operations or any tactical use.

The kit contains:

  • GL-Shock – Shock Absorbing Buttstock
  • ARP – Buttpad for GL-Shock
  • AGR-43 – Rubberized pistol grip
  • NFR – Aluminum Quad Rail System
  • MWG – Magwell Grip
  • REG – Rubberized Foregrip
  • FBS & RBS – Front and Rear Backup Sights
  • 2x SLS – Sling Swivel

Kit Information

GL-Shock – Shock Absorbing Buttstock


The revolutionary patented ‘GL-Shock’ absorbing Buttstock contains a recoil-reducing mechanism with a built in premium silicon chrome alloy spring creating a State-of-the-Art stock for your M4/M16.


  • Unique Patented “Anti-Rattle” Mechanism
  • Sleek New Design with No Protruding Parts,Will Not Get Caught on Gear and Webbing
  • Unique New Slick and Quick Operated Inversed Positioning Lever
  • Integral Ribbed Rubber Butt Pad with a Non Slip Design
  • Integrated Quick Detach Sling Swivel Connectors on Both Sides
  • Watertight Battery Storage for Two CR123A 3V Lithium Batteries / AA 1.5v
  • Fits Perfectly on Both Tubes – MIL-SPEC and Commercial Aftermarket!
  • Made from Mill-Spec Reinforced Polymer Composite

ARP – Buttpad:

ARP - GL Shock Buttpack

The ARP Assault Rubberized Butt-Pad is a maneuverability enhancing upgrade for GL-SHOCK, GL-MAG or GK-MAG Buttstocks.


  • Provides rapid shoulder positioning and faster, more comfortable target change
  • Made of reinforced polymer composite with textured rubber overmold
  • Non-slip textured rubber allows fast and stable shoulder positioning


  • GL-SHOCK, GL-MAG or GK-MAG Buttstocks.

AGR-43 – Rubberized pistol grip


The AGR-43 is the latest addition to our line of Pistol Grips featuring State-of-the Art Multi-Textured Rubber, enhancing your grip experience. Incorporated into its design, is the superior contour of its predecessor, adding even more comfort and proper ventilation needed in extreme heat and moist environments, giving you the edge you need in the field or at the range.


  • MIL-SPEC Reinforced Polymer Composite with Muti-Textured Rubber Overmold Superior Coating
  • Three Different Rubber Overmolded Style Textures; Rib Studded at Palm, Alligator Pattern for front Fingers and Moon Surface Textured Sides
  • Multi Rubber Texture Provides Superior Comfort; Adds Appropriate Ventilation, Prevents Slip and Reduces Sweaty Palms
  • Finger Swelts and a Backstrap Shape Design Provides Enhanced Grip, Even when Wet
  • Extended Beavertail for Better Control, Allowing a Higher Firmer Hold
  • Readily Accessible Storage Area with Securely Sealed Hinged Door

NFR – Aluminum Quad Rail System

NFR - Aluminum Quad Rail

The New NFR Aluminum Quad Rail System Provides you with a Carbine Length M4 Forend Upgrade enhancing your weapon’s overall tactical performance Ventilation and Versatility. 

  • Rail System Adds Four Mil-Spec Picatinny Rails for Versatile Mounting Accessory Applications
  • Precision Machined from 6061 T6 Billet Aluminum for Maximum Strength and Durability
  • Fully Rugged Construction Will Not Bend or Deform Under any Conditions
  • Field Tested Under Extreme Conditions for Maximum Performance and Durability
  • Hard Coat Anodized for Optimum Wear Resistance
  • Replace your Polymer Handguards,Simple Installation,Secured by 4 Bolts
  • Rail System Firmly Locks to the Barrel Nut and Front Handguard Cap
  • No Gunsmith Required
  • System Aligns Perfectly Upper Receiver Rail
  • Receiver Alignment is Achieved by Implementation of Anti-Rotation Locking Tabs
  • Slim Profile for Better Grip and Handling of Firearm


  • M4 & Variants


Weight 293 gr
Width 55 mm
Height 80 mm
Length 177 mm


MWG – Magwell Grip

Magwell Grip

The MWG converts the magazine well into a comfortable, ergonomical vertical grip for enhanced control of the weapon.


  • Provides a tight hold for speed and maneuverability
  • Prevents pressure on Non-free-floating handguards that can affect accuracy and keeps hands off the magazine
  • The MWG also functions as a flared and extended magazine well which enhances reload speed
  • Incorporates a serial number window viewer
  • MIL-SPEC reinforced polymer construction.


Fits MIL-SPEC M16, M4 and AR-15 lower recievers

*** Will not fit: Bushmaster AR15, Stag AR15, MAGPUL magazines.


Weight 82 gr
Width 45 mm
Height 71 mm
Length 91 mm

REG – Rubberized Foregrip

Rubberized Foregrip

The New REG State–of-the-Art Rubberized Ergonomically Designed Tactical Foregrip.


  • Unique comfortable texture and sleek contour for superior hold
  • Compact Non-slip design for use with or without gloves
  • Enhances overall tactical versatility,Picatinny compatible
  • Convenient waterproof storage compartment for batteries, cleaning kits, etc.
  • Secure mount with durable bolt locking
  • Made with high quality latex and reinforced polymer composite material


Weight 138 gr
Width 47 mm
Height 119 mm
Length 54 mm


2x SLS – Sling Swivel

Sling Swivel


  • Mounts To Any FAB Defense QD Port
  • Easily Attached with Swivel Clip Type Strap attachment
  • Secure Mechanism, Will Not Brake Free Accidentally
  • Made with Durable Steel, CNC Machined
  • Locks in Place by a Simple Push
  • Ambidextrous, May be Used on Right or Left Side
  • Easy Detach by a Push of a Button

FBS & RBS – Front and Rear Backup Sights


The FBS + RBS Front + Rear polymer Back-up sight is a cutting edge, low-profile, tactical back-up sight.

The dual aperture FBS Front + RBS rear sight is windage adjustable and can be mounted on all 1913 picatinny rails, but is specialty made for the M4 / AR-15 / M-16 platform and the K.P.O.S.


  • Very low profile & slim design
  • Can be used as primary or back-up sight
  • State-of-The-art ergonomic & ambidextrous design
  • All manual configuration, no tools needed for windage adjustments
  • Durable high grade polymer & metal construction
  • Spring based locking mechanism – will not break or deform

Optional Add-Ons:

PLR – Adjustable Mount for Flashlight

Flashlight Mount

The new ‘PLR’ Tactical Light Mount adjusts to the right,left and underside of barrel.The PLR was designed to add tactical light versatility complimenting your individual tactical preference.


  • Provides Ambidextrous Adjustable Tactical Light Option
  • Side to Side Versatile Tactical Light Positioning Allows You to Set Your Tactical Light to Various Positions, (Parallel Right, Left and Numerous Underside Positioning).
  • Fits Perfectly on Picatinny Compatible Rails
  • Designed to Hold All 1’’ Diameter Tactical Lights
  • Adjust to Individual Preferred Setting
  • Increases Your Tailcap Access Options
  • Secure Bolt Locking System
  • Tough Rigid & Lightweight Reinforced Polymer Design
  • Easy to Install, No Gunsmith Required



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