Materials for barrels:
| Code | Type | Material | Hardness |
|---|---|---|---|
| AA | Solid | Nitrided steel | 750-850 HV0,5 |
| BG | Liner | PM-HIP | 59-62 HRC |
| B2 | Liner | Tool steel | 61-64 HRC |
| B5 | Liner | Hardened stainless steel | 48-50 HRC |
| SN | Liner | Stainless tool steel | 58-60 HRC |
| HN | Solid | HIP compound steel | 58-60 HRC |
| CC | Liner | Tool steel | 55-58 HRC |
