Key Features:
- Manufacturer: Geissele Automatics
- Model: SD556
- Caliber: 5.56MM
- Barrel Length: 13.9"
- Twist Rate: 1-7
- Finish: Chrome Lined, Manganese Phosphate
- Threads: 1/2 x 28
- Profile: Government
- Gas System Length: Carbine
- Weight: 2.0000
- What's In The Box: Barrel
| __Caliber | 5.56x45mm NATO | 
| __Barrel Length | 13.90" | 
| __Twist Rate | 1:07 | 
| __Model | SD556 | 
| __Rifling | Cold Hammer Forged | 
| __Material | Chrome Moly Steel | 
 
 
                                 
                                         
                                        