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 | .5 lbs |
|---|---|
| Dimensions | 6.5 × 1.2 × 1.2 in |
