Adams Arms AR-15 P1 Gas Piston Upper Receiver Assembly 5.56x45mm NATO 16” Barrel

(34 customer reviews)


Adams Arms AR-15 P1 Gas Piston Upper Receiver Piston-driven AR uppers are a popular upgrade for shooters … Adams Arms P Series Uppers … Superlative Arms Adjustable Gas Piston Kit


Adams Arms AR-15 P1 Gas Piston Upper Receiver – Product Overview

A short-stroke gas piston operating system, which prevents hot gas and debris from coming back into action while shooting, is a feature of every Adams Arms AR-15 P1 Gas Piston Upper Receiver. However, the end result is a firearm that is more dependable, cleaner, and runs cooler than firearms that use a conventional direct gas impingement operating mechanism.

This 5.56x45mm NATO-chambered Adams Arms P1 is equipped with a lower receiver that can be mounted to any common AR-15 upper receiver and is ready to fire right out of the box. The Base Mid upper comes equipped with the 16′′ melonite-finished barrel, Adams Arms Ar pistol, bolt carrier group, charging handle, Picatinny rail gas block, Glock 42 Semi-Automatic.380 ACP delta ring group, and Magpul MOE handguards.

Other characteristics include forged A3 flat-top configuration WARRIOR ASSAULT SYSTEMS ready to receive the shooter’s preferred optic, M4 feed ramps to help ensure reliable feeding and functioning during short strings of fire, and a mid-length gas system for a softer recoil impulse and longer sight diameter.

Is a 308 from Adams Arms worth it?

Because they are less vulnerable to Kimber Micro 9 Black OI fluctuations in ammo, the Adams Arms 308 Gun Professionals are typically seen as being more trustworthy. Piston pistols operate more cleanly and, some claim, more coolly than natural impingement actions since no propellant gases are introduced into the operating system.

Which is superior, Adams Arms Ar10 or Piston?

Adams arms ar10 are often lighter, more precise, and more affordable. On the other hand, piston-driven systems run more smoothly and with greater dependability SPEER GOLD-DOT-9MM-LUGER 124 500Rds. The decision is ultimately up to you.

Which is preferable, 11.5 piston upper or gas?

Since gas is directed into the piston rather than the action, an upper working system with 11.5 pistons operates significantly more efficiently. As a result, it requires less lubrication and cleaning. Gas-piston weapons, such as the AK-47, Ruger Mini-14, or M1 carbine, operate more consistently.


  • Magpul MOE handguard
  • 16″ QPQ melonite barrel
  • A2 flash hider

Product Specifications

Cartridge 5.56x45mm NATO
Finish QPQ Black
Material Aluminum
Weight 4.375 Pound
Barrel Length 16 Inches
Barrel Material 4150 Chrome Moly Vanadium Steel
Barrel Finish QPQ Black
Twist 1:7 Inches
Threads 1/2″-28
Barrel Contour Government
Sights No
Chrome Lined No
Gas Block Diameter 0.75 Inches
Gas System Length Carbine, Short Stroke Piston Operated
M4 Feed Ramps Yes
Upper Receiver Type AR-15 Flat-Top Gas Piston
Handguard Magpul MOE Mid-length
Bolt Carrier Assembly Included Yes
Muzzle Device A2
Mil-Spec or Commercial Mil-Spec
Compatible With

34 reviews for Adams Arms AR-15 P1 Gas Piston Upper Receiver Assembly 5.56x45mm NATO 16” Barrel

  1. Frank L

    Awesome package! Arrived early, great packaging, highly recommend

  2. Melvin F.

    Quick delivery, and all products in great shape

  3. Daniel T.

    First look at this lower, the fixed trigger guard seems a bit bulky. Other than that I cant say. Have not milled this lower out so have no idea of the finished product.

  4. Harmony

    perfect 👍

  5. Lucky B

    Well manufactured

  6. Samuel H

    easy to machine with the jig easy to build works great

  7. Richard H

    Excellent product

  8. Garfield

    Not only do they have great products, their customer service is outstanding!! My go to company.

  9. Fred K

    Good price. Fast shipping. Arrived faster than i had expected. I ordered another list from a different company and this one has better tighter tolerance. The build material and quality is very good for what you get. I like the look of it. Nice lower.

  10. Robert D.

    Couldn’t be happier. I can now supply myself with freedom our strong country should have! Let’s Go Brandon!

  11. Tim.

    Received the part and it was in perfect condition and exactly what I wanted, part was just as described and is a perfect addition to my build. I will purchase again.

  12. Todd P.

    Impressed with the product overall. Nice features and within specs. Happy with my purchase.

  13. Roland T.

    Great value for the price. Works as it should.

  14. Herman J

    Looks great material is good it’s my 4th one I got

  15. Patt V.

    Awesome parts and delivery!

  16. Luciano K.

    Shipped very quick and received in good condition. While I haven’t built them yet, they are very nice and I’m looking forward to my next build with them.

  17. Patterson P.

    A very nice piece of metal.

  18. Eric O.

    Works great just what I wanted. Hope to buy more in the future

  19. Jim P.

    Perfect fit

  20. Jimmy T

    Great quality would have given 5 stars if the shipping didn’t take so long

  21. Shelby G.

    Great quality would have given 5 stars if the shipping didn’t take so long

  22. Fred F

    Can’t rightly remember how many builds… all great and looking forward to future work with this company!!!

  23. Adam R.

    Everything seems legit

  24. John R.

    Perfect, looks are as always fantastic, cuts sharp and clean

  25. David B.

    Amazing product here.

  26. Tom T.

    Sweet piece solid as one can be

  27. Jason h.

    Great product, easy to finish!

  28. Cole S.

    Excellent product and services, as usual… Thanks for continuing to defend our rights!!

  29. Harry S

    Haven’t yet decided on what type of setup I plan on building. But once I’m ready I know I have a highly recommended lower.

  30. Darryl

    Great looking, finish is great! Looking forward to starting my new build on a great foundation!

  31. Darren P.

    The finish is not perfect, so if you are looking for a show piece you will have to refinish it. But other than that, they came quickly and worked fine.

  32. Mike W

    perfect…. fast shipping and delivery

  33. Bullz

    Love the website. Absolutely love how my ar turned out. I will attach a finish picture of my gun

  34. matthew c.

    Shipping was really fast, it took 2-3 days for process and shipping. once i got it i started milking it out and it fit my PSA upper seemlessly

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