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Regulate Your AR-15 With an Affordable Gas-Piston System

PRIMARY WEAPONS – MK-116 PRO RIFLE 223 WYLDE. In contrast to the common direct-impingement system featured on most of today’s AR-15s, gas-piston systems provide several features that make the alternative arrangement desirable to many AR fans. Gas-piston systems introduce less fouling into the gun’s receiver, and the configuration of the long-stroke piston system seen on the Primary Weapons MK-116 Pro Rifle enables users to fine-tune gas flow for particular usage.

Each MK-116 Pro Rifle is chambered in .223 Wylde, enabling users to use either .223 Rem. or 5.56 NATO with greater accuracy. The long-stroke technology on the rifle, while being economical compared to other piston-driven weapons, also allows three alternative settings for customers. This allows the pistol to be calibrated for use with suppressors as well as particular ammo types, offering greater dependability.

  • Barrel length: 16.1 inches
  • Overall length: 32.37-36 inches
  • Ships with one 30-round magazine
  • All-black finish

The PWS MK-116 Pro lineup also includes standalone upper receivers that fit onto any standard AR-15 lower receivers, so shooters can upgrade their guns with the long-stroke system without having to order an entirely new firearm. The guns offered by PWS are outfitted with Radian Raptor charging handles and also feature free-float M-LOK handguards as well as specially designed furniture mounted on the company’s Enhanced Buffer Tube.


  • Action Type: Piston
  • Barrel Length: 16.1″
  • Capacity: 30+1-Round
  • Cartridge: 223 Wylde
  • Finish: Black
  • Front Sight: None
  • Length: 32.37″-36″
  • Magazine Included: 1 x 30-Round
  • Magazine Type: Removable
  • Muzzle: Brake
  • Rear Sight: None
  • Stock Material: Polymer
  • Weight: 6.9 lbs
  • Made in the USA


Products require a Federal Firearms License to be on file. If we don’t have a FFL for you, your order will be put on hold until it is received. Please email, fax 641-623-8143 or mail a clear signed copy to: Attn: FFL Dept, 200 S. Front Street, Montezuma, IA 50171. You must be 18 years of age or older except in states that require an individual to be 21 to purchase rifles and shotguns also 21 years of age or older to purchase handguns, receivers, and suppressors.Out of Stock
Product temporarily out of stock. Click on the Back Order button to back order or click on the View Alternatives button to find an alternate if available.


Make: Primary Weapons System

Model: MK116 Pro

Primary Weapons Systems, MK116 Pro Upper, 223 Wylde, 556NATO, 16.1″ Barrel, PWS 15″ MLOK Handguard, Radian Raptor Charging Handle, Black Finish

  • Operating System: PWS Long Stroke Piston System, 3-Setting Adjustable Gas System
  • Caliber: .223 Wylde
  • Barrel: 416 Stainless Steel, Button Rifled
  • Handguard: PWS free float Mlok(TM)15″ Handguard (1.6″ width, 2.1″ height)
  • Charging Handle: Radian Raptor(TM)Ambidextrous Charging Handle

Product Description

The PWS MK1 PRO series incorporates the tried and reliable PWS long-stroke piston technology. This series is great for shooters searching for a cost-effective piston system pistol without losing the high-quality standards PWS has been renowned for over a decade.

Featuring a 3-setting adjustable gas system for users with suppressors, free-float MLOK handguard, Radian Raptor charging handle, an extruded upper receiver that integrates an extremely solid handguard attachment system, the MK1 PRO line has an assortment of features ideal for shooters of all levels. Available as a full upper or entire weapon (both pistol and rifle versions) (both pistol and rifle configurations).

As with other PWS full upper receivers, they will fit perfectly to any AR15 lower receiver with no need for extra attachments. The PRO series is the greatest bargain on the market when it comes to piston-driven operating systems, incorporating high-end features and unique components.

No additional costs for credit cards. Due to the enormous amount of orders we’ve received, there is a 5-7 day delay on shipment. It is The buyer’s duty to supply us with their dealer’s FFL for all gun sales. Communication is also sluggish as we are attempting to mail everyone’s things. Please make sure that your email address is active on Gunbroker.

We utilize your supplied email address for FedEx tracking. As long as your email address is active you will get tracking details once your item arrives. If we require anything from you such as FFL info you will be notified. If you do not hear from us it indicates we have everything we need to get your order approved.


UPC 811154030955 Manufacturer Primary Weapons Systems
Manufacturer Part # 19-PM116UA0B Model MK116 Pro Upper
Type Upper Caliber 223 Wylde
Caliber 556NATO Barrel Length 16.1″
Color Black Description MLOK
Fit AR Rifles Subcategory Complete Upper Receivers
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