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The ERGO M-LOK Modular Free Float Rail System is lightweight and constructed of 6061-T6 aluminum, type III black hard-coat anodized, and CNC machined in one piece with a 1.8 inside diameter and 2.0 outside diameter. It accepts most suppressors as well as ERGO and all other M-LOK accessories including ERGO WedgeLok Rail Covers

Includes:

- 6061-T6 aluminum barrel nut with shims and harware.

Specifications:

- Length: 9"
- Finish: Black
- Uses: USGI barrel nut wrench.