Sons of Liberty Gun Works M4-89 5.56 NATO AR-15 Upper - 10.5"
AR-15 Partial Upper Receiver
In stock
Only 4 left
Sons of Liberty Gun Works M4-89 5.56 NATO AR-15 Upper - 10.5"
$855.00
Specifications:
- Barrel: Sons of Liberty Gun Works 4150CoMOV 1:7 MPI HPT Barrel
- Barrel Steel: 4150 CrMoV (Chrome Moly Vanadium per MIL-B-11595E)
- Twist Rate: 1/7 Twist Six Groove
- Thread Pitch: 1/2-28 Threaded Muzzle
- Gas Block: .750″ Gas Block Journal with appropriately sized gas port
- Barrel Finish: QPQ Corrosion Resistant Finish
- Barrel Extension: QPQ coated M4 Feed Ramp Extension
- High Pressure (proof) Tested (HPT)
- Magnetic Particle Inspected (MPI)
- Twist Rates & Thread Pitches will match caliber. Match-grade firearms will have 416 Stainless Steel barrels.
- Carbine Gas System
- A2 muzzle device
| SKU | M489UPPER-10.5-556 |
|---|---|
| Product Type | AR-15 Partial Upper Receiver |
| Manufacturer | Sons of Liberty Gun Works |
| Gas Block Diameter | .750" |
| Thread Pitch | 1/2x28 |
| Twist Rate | 1:7 |
| Color | Black |
| Gas Length | Carbine |
| Platform | AR-15 |
| Caliber | 5.56 NATO |
