The inserts are marked according to the dummy suppressors used, real dimensions (outer diameters):
| Insert mark | Insert diameter [mm] | Compatible suppressor model |
| 40 mm | 36 | Rotex-V3 (gen2) - ASG |
| SVU | 34,8 | SVU - Cyma, Rotex gen1 - ASG |
| SF556 | 33 | SF 556/762 - AngryGun/AirsoftArtisan |
| 35 mm | 31 | |
| 34 mm | 30 | DeltaArmory/SpecnaArms stock silencers |
| MK23 Socom | 29 | Mk23 Socom TM/ASG |
| 32 mm | 28 | |
| 30 mm | 26 |