If you’re looking for a reliable, high-end AR-15 upper with and 18-inch barrel look no further than the Primary Weapons Systems MK118 Upper. The MK118 is a quality long stroke piston upper that has proven reliable for multiple applications. This upper features the advanced .223 Wylde chamber which offers accuracy with a variety of .223 Rem and 5.56 NATO ammunitions.
The PWS MK118 Upper is an advanced design MK1 upper from Primary Weapons Systems. The MK1 upper combines the long term reliability of the AK-47 with the operator friendly flexibility of the AR platform. The result is a long stroke piston upper that has an amazing service life with greater reliability and less opportunity for individual parts failure than most AR Upper on the market. The secret is the union of the Bolt Carrier Group and free-floating piston head. A simple operating rod joins the two pieces, creating a single operating unit that is far easier to maintain than impingement systems. It requires far less attention in the field because it is not as susceptible to the effects of fouling than traditional AR Uppers.
If you’re ready to take full advantage of the evolution of modern weaponry, you need to get your hands on a PWS MK118 Upper. Like the rest of PWS’ awesome MK1 MOD 2 line, the MK118 features FNC LIFE HD surface treatments, integrated Quick Disconnect Mounts, Picatinny upper rails and the ultra-flexible PicMOD® rail which provides a functional accessory mounting surface for both Picatinny and KeyMOD Accessories. Gas management is enhanced by a simple three position selector that helps provide optimum pressure with whatever ammunition you choose.
The MK1 Mod 2 Upper is a forged upper with a difference. Primary Weapons Systems doesn’t forge it and forget it. This Upper is forged and then precision machined to remove excess material, creating a sleeker, lighter upper that retains the incredible strength of a forged upper. The reliability of the long piston upper allows PWS to further reduce mass by dropping the forward assist altogether for a more streamlined silhouette.
You don’t want to stagnate, you want to evolve and move ahead of the pack. Choose the PWS MK118. Primary Weapons Systems, Because It’s Time.
NOTE: For the protection of our customers and various safety and legal liability reasons, we do not accept returns on ammunition, firearms, barrels, or any product that contains a barrel. Defective firearms, barrels, any product that contains a barrel (ie, complete AR-15 uppers, complete pistol slides, etc.) and ammunition must be returned to the original manufacturer for warranty service. You can have peace of mind that all firearms, barrels, complete uppers, and ammunition that we sell are brand new from the manufacturer, and have never been used, installed, or modified.