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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: 691527
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 suited to compact rifle builds where a shorter upper is preferred. It uses a carbine-length, short-stroke piston-operated gas system and includes a Samson Evolution Extended Modular Rail with a free-float design, along with adjustable front and rear flip-up sights. The package also comes with a bolt carrier assembly and an A2 flash hider, while the 1 in 7" twist and QPQ Melonite / Black Nitride barrel finish round out the listed configuration. As a police trade-in, condition should be reviewed carefully from the provided photos, and the chamber and bore are noted as very good.
Why Hunters Choose the Adams Arms
A3 Flat-top
Forged upper receiver for optics-ready
11.5-inch Government-contour
Barrel chambered in 5.56x45mm NATO
Short-stroke Piston-operated
Carbine gas system included
Samson Evolution
Extended modular free-float rail installed
Adjustable Front
Rear flip-up sights included
Key Features
- Police trade-in Adams Arms complete upper receiver
- A3 flat-top forged upper receiver
- 11.5-inch government-contour barrel
- 5.56x45mm NATO chamber with 1:7 twist
- Short-stroke piston-operated carbine gas system
- Samson Evolution extended modular free-float rail
- Adjustable front and rear flip-up sights
- Bolt carrier assembly included
Best Used For
- Shooters wanting a compact 11.5-inch upper for a carbine-length 5.56 NATO build.
- Hunters or range users who prefer a short-stroke piston-operated upper with included bolt carrier assembly.
- Users needing a flat-top upper with adjustable flip-up sights for flexible optic setup.
- Buyers comfortable with a police trade-in upper and checking photos for overall condition.
- Those building around a free-float Samson Evolution rail and A2 flash hider.
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
- A3 flat-top forged upper receiver for optics-ready setup
- 11.5-inch government-contour barrel chambered in 5.56x45mm NATO
- Short-stroke piston-operated carbine gas system included
- Samson Evolution extended modular free-float rail installed
- 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 described as very good chamber and bore, but overall wear should be verified from the photos before purchase.
- The 11.5" barrel and carbine-length, short-stroke piston system make this a compact setup, but it is not a full-length upper and may not suit buyers looking for a longer sight radius or barrel.
- The upper uses a free-float Samson Evolution Extended Modular Rail, but rail sections are not included in the listed weight, so final setup weight will vary once accessories are added.
- It is listed with an A2 flash hider and no chrome-lined barrel, so buyers should confirm those specifications match their intended use and maintenance preferences.
Suggested Comparisons
- AR-15 complete upper receivers
- Piston-operated upper receiver assemblies
- 5.56 NATO upper receivers
- Free-float handguard upper assemblies
Suggested Accessories
- AR-15 upper receiver accessories
- Flip-up iron sights
- Rail sections
- Weapon cleaning kit
Frequently Asked Questions
What comes 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, Samson Evolution Extended Modular Rail, and adjustable front and rear flip-up sights.
What barrel and chamber specifications are listed for this upper?
The listed barrel is 11.5 inches with a government contour, made from 4150 Chrome Moly Vanadium steel. The chamber is 5.56x45mm NATO, with a 1 in 7 inch twist rate and M4 feed ramps.
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.
Is the barrel chrome lined?
No. The product data specifically states that the barrel is not chrome lined. The barrel finish is listed as QPQ Melonite / Black Nitride.
What condition is this police trade-in upper in?
The long description says the chamber and bore are in very good condition. It also notes that buyers should see the photos for overall condition.