Is that M82 (.50cal), or Rytec Amr (XM109) (25×59mm)?
Specifications
General Characteristics
- Created On Android
 - Wingspan 3.8ft (1.2m)
 - Length 38.8ft (11.8m)
 - Height 9.5ft (2.9m)
 - Empty Weight 2,092lbs (949kg)
 - Loaded Weight 2,092lbs (949kg)
 
Performance
- Wing Loading 6,222.1lbs/ft2 (30,379.1kg/m2)
 - Wing Area 0.3ft2 (0.0m2)
 - Drag Points 2773
 
Parts
- Number of Parts 88
 - Control Surfaces 0
 - Performance Cost 233
 
          
              
              
              
                  
                  
                
Hmmmmm, not an M82, but very similar. M82 is much longer, has a straight up and down magazine, and doesn't have that weird top rack...
Or maybe you just made a few detail mistakes while building. Good job tho.