Expo Arms has recently gotten into the AR-15 upper receiver market. They have a few options for pistols, SBR’s, and standard AR configurations. This particular upper is their Patrol series with a 16” barrel and A2 flash hider. If you didn’t know, Expo Arms is the in-house brand for Primary Arms and is sold exclusively through them.

The Expo Arms Patrol Series is an everyday use AR-15 barrelled upper receiver. These do not come with a bolt carrier group (BCG) or charging handle. However when you order the upper, Primary Arms gives some drop down menus with discounted add ons, such as a BCG. The Patrol Series comes with a bunch of good specs: A 5.56 chamber, 1:7 twist nitrided 4150 cmv barrel, mid-length gas system, A2 flash hider, T-marked upper receiver, and a 15” M-Lok handguard.

Barrels are an important part of any AR system. On 16” barrels, like this one, I like mid-length gas systems. They are smoother feeling and put less wear on components then a carbine length gas system. Being that the barrel is also salt bath nitrided, it will have a good lifespan and keep corrosion away. Expo Arms uses a SOCOM profile on the barrel. I like the profile as it gives strength and consistency without being heavy. Of course the muzzle is threaded and comes with an A2 flash hider installed. The barrel consistently shoots under 1 MOA for me with 69 grain match rounds.

Expo Arms uses their own T-marked upper receiver. This is a standard forged version made from 7075-T6 aluminum. It has a round style forward assist and a standard mil-spec port door. The whole upper is nicely machined and anodized.

To cover the barrel, and give you something to hold onto, is the 15” M-Lok handguard. This is a very nice, useful, no frills handguard. It runs a full top rail that is not sharp. The sharp parts of the rail have been deburred slightly. Along the other portions of the handguard are M-Lok slots. These M-Lok slots are every 45 degrees around the handguard, not just the standard of every 90. It’s a clamp on style handguard, but also has some anti-rotation tabs to keep it from rotating. I’ve never had a problem with these style handguards rotating on me, but the tabs are a nice addition. I really liked the Expo Arms handguard, I’d even consider it as a stand alone item.

If you’re looking for a good quality AR upper, the Expo Arms Patrol series might just be it. It has a lot of nice features for the price. In fact, I am still amazed at the 0.75” group I shot with it. Definitely go check out the Expo Arms series of stuff over at Primary Arms.