RetroArms CNC Stainless Steel Cylinder – Type E, Cyma SVD, Real Sword SVD and A&K SR25
| Recommended Inner Barrel Length |
| Type A |
130 – 239mm |
| Type B |
240 – 289mm |
| Type C |
290 – 369mm |
| Type D |
370 – 650mm |
| Type E (SR25 model, 10mm longer than a standard cylinder!) |
470 – 650mm |