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AR-15 Upper Assemblies


By choosing from among the AR-15 upper assemblies we stock at PMA, you can rest assured that you’ll find exactly what you need. PMA's AR-15 upper receivers are made from high-quality materials and come with a MILSPEC flat top receiver with M4 feed ramps. They are available with many choices of different barrels including our 4150 chrome moly barrel with a phosphate finish or nitride finish.


For even more customization, check out our selection of free float hand guards. You can choose from our many AR15 upper options that include Keymod rails, M-Lok and basic hand guards. When constructing your upper you can choose from multiple different twist rates and lengths in order to meet your needs. One option available features a 16” 5.56 Barrel with a 1/9 twist and a carbine length gas system. The 12-inch MLOK rail has a thin sleek feel that allows you to have superior control over the front end of your rifle. We use nothing but high-quality steel gas blocks and tubes. The standard A2 flash hider rounds out the upper or you could choose from our premium muzzle devices. Each upper receiver features clean evenly applied Type II anodizing.

When deciding which AR parts you want to include in your build there are several things you need to consider the components are the Upper Receiver, Barrel, Gas Block, Hand Guard, Bolt Carrier Group and Muzzle device.

Our uppers are cut to MILSPEC to ensure continuity when choosing your other components. The uppers are cut from 7075 T6 aluminum forgings with M4 feed ramps. The picatinny rail has relief cuts that aid with installing your sights and provide a clean look overall. They are then tumbled and deburred before they are coated with Hard Coat Type II anodizing.

We use several different types of barrels. Our standard “go to” barrel is cut from a 4150 Chromoly Vanadium barrel blank. They are then turned in either Pistol Length Gas, Carbine Length Gas or Mid-Length Gas and finished in either a medium contour or M4 profile. The barrels also come dimpled to assist with alignment. As for coatings our main barrels are Phosphate coated but we maintain multiple offerings in nitride as well. We also offer several barrel upgrades in the drop-down menus.

What we believe is the most important part of your AR-15 Upper is the gas block. Without a high-quality gas block the rifle will not fire. A combination of misalignment and poor materials can make for a challenging build and a terrible day at the range. Our gas blocks are CNC machined 4140 Steel that have a slightly over sized port to capture all the gas available to ensure your rifle operates consistently. They come heat treated and nitride coated for a great looking block that exceeds the industry standard.

The free float hand guards we offer come in two varieties. Currently available are Keymod and MLOK. The rails are 6061 Aluminum and anodized black to mate with our black upper receivers. Our standard uppers the come with handguards that are either 12”, 13” or 15”. Our Pistol Uppers and SBR Uppers can range from 7” to 12” depending on the configuration chosen.

The muzzle device is also an integral part of the upper as it can assist the shooter in controlling muzzle rise and off set the flash created. Our Upper Receiver Assemblies come with a 5 port A2 Bird cage muzzle device with the option of upgrading to a VG6 Gamma or Epsilon. Our pistol uppers come with either an A2 bird cage or a Kak Industries Flash Can.

Our full range of AR-15 upper parts for sale is designed to provide you with everything you’ll need to take your game to the next level. If you aren’t sure which AR upper assemblies are best suited for your needs, speak to one of our veteran firearms experts today. Or order now and design the most precise custom firearm available!

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