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ADAMS ARMS Complete Upper Receiver
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$699.99
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SKU: 691558
Overview
This complete upper is built around an A3 flat-top forged receiver and an 11.5" government-contour barrel chambered in 5.56x45mm NATO, making it a compact option for a short-barreled setup. It uses a carbine-length, short-stroke piston-operated gas system and includes a one-piece bolt carrier assembly with an integral piston strike face. The Samson Evolution extended modular free-float rail and adjustable front and rear flip-up sights provide a practical platform for configuring the upper to the rifle and the task at hand. As a police trade-in, it is offered with chamber and bore noted in very good condition, and buyers should review the photos for overall condition before purchase.
Why Hunters Choose the Adams Arms
11.5-inch Government-contour
Barrel in 5.56x45mm NATO chambering
Short-stroke Piston-operated
Carbine gas system
Forged A3
Flat-top upper receiver
Samson Evolution
Extended modular free-float rail
Adjustable Front
Rear flip-up sights included
Key Features
- Police trade-in Adams Arms complete upper receiver with A3 flat-top forged upper.
- 11.5-inch government-profile barrel chambered in 5.56x45mm NATO.
- 4150 Chrome Moly Vanadium steel barrel with QPQ Melonite / Black Nitride finish.
- Short stroke piston-operated carbine gas system with 0.750-inch gas block diameter.
- Samson Evolution Extended Modular free-float rail and A2 flash hider included.
- Adjustable front and rear flip-up sights plus bolt carrier assembly included.
Best Used For
- Shooters wanting a compact 11.5-inch 5.56 NATO upper for a shorter rifle build.
- Hunters needing a complete upper with included bolt carrier assembly and flip-up sights.
- Users who prefer a free-float rail setup for accessory mounting on a compact platform.
- Buyers considering a police trade-in upper with disclosed condition details before purchase.
- Those building around a carbine-length, short-stroke piston-operated upper receiver.
Specifications
| Barrel Contour | Government |
|---|---|
| Barrel Finish | QPQ Melonite / Black Nitride |
| Barrel Length | 11.5" |
| Barrel Material | 4150 Chrome Moly Vanadium Steel |
| Bolt Carrier Assembly Included | Yes |
| Bolt Carrier Type | 1-Piece w/Integral Piston Strike Face |
| Chamber | 5.56x45mm NATO |
| Chamber Bore Condition | Very Good |
| Chrome Lined | No |
| Condition | Police Trade-In |
| Gas Block Diameter | 0.750" |
| Gas System Length | Carbine, Short Stroke Piston Operated |
| Handguard | Samson Evolution Extended Modular Rail, Free Float |
| M4 Feed Ramps | Yes |
| Muzzle Device | A2 Flash Hider |
| Muzzle Thread Pattern | 1/2"-28 |
| Overall Condition | Please See photos for Overall Condition |
| Sights | Adjustable Front & Rear Flip-Up |
| Twist Rate | 1 in 7" |
| Upper Receiver | A3 Flat-Top, Forged |
| Weight | 4.28 lbs (Without Rail Sections) |
Pros
- 11.5-inch government-contour barrel in 5.56x45mm NATO chambering
- Short-stroke piston-operated carbine gas system
- Forged A3 flat-top upper receiver
- Samson Evolution extended modular free-float rail
- Adjustable front and rear flip-up sights included
- Bolt carrier assembly included with integral piston strike face
Considerations & Trade-offs
- This is a police trade-in upper, so condition is not new; the listing notes the chamber and bore are in very good condition, but overall wear should be reviewed in the photos.
- The 11.5" barrel and carbine-length, short-stroke piston system make this a compact setup, but it is a shorter configuration than a full-length upper.
- The handguard is a free-float Samson Evolution Extended Modular Rail, and the weight listed is without rail sections, so the final setup weight will vary with installed accessories.
- The package includes adjustable front and rear flip-up sights and a bolt carrier assembly, but it is sold as a complete upper rather than a full rifle.
Suggested Comparisons
- Complete upper receiver assemblies
- AR-15 upper receivers
- Piston-operated upper receiver systems
- Short-barrel rifle uppers
Suggested Accessories
- AR-15 upper receiver parts
- Flip-up iron sights
- Free-float handguard accessories
- Muzzle device accessories
Frequently Asked Questions
What is included with this Adams Arms complete upper receiver?
The listing states that a bolt carrier assembly is included. It also identifies the upper as a complete upper receiver with an A3 flat-top forged upper, barrel, handguard, muzzle device, and flip-up sights.
What are the barrel and chamber specifications?
The barrel is listed as 11.5 inches, government contour, made from 4150 Chrome Moly Vanadium steel, with a 1 in 7 inch twist rate. The chamber is 5.56x45mm NATO and M4 feed ramps are listed as included.
What type of gas system does this upper use?
It uses a carbine-length, short stroke piston-operated gas system. The gas block diameter is listed as 0.750 inch.
What sights come on this upper?
The listing says it includes adjustable front and rear flip-up sights.
What condition is this police trade-in upper in?
The description says the chamber and bore are in very good condition. It also notes that buyers should see the photos for overall condition.