Please email us at techsales@opticsplanet.com regarding your question.
The SLR ION Mid M-LOK 5.56 Handguard is black and Mil-Spec Hardcoat Anodized. This Rail will include a 7075 Barrel nut w/ Hardcoat Anodize. Barrel nut uses standard wrenches or SLR Billet wrench for perfect fit.
The weight is 9.4 oz.
The length is 12.25in.