This metal buffer tube fits all KM4 Series AEGs, including the CQR and KM16 Series and allows MilSpec 6-position stock functionality. It appears on KM4 diagrams as part 509 (or as part 80 on the CQR Series diagrams).
| Weight | 0.069 lbs |
|---|---|
| Dimensions | 6.75 × 1.5 × 1.5 in |
