実物、開封しておりますが、未使用です。

MCMR features M-LOK Compatible mounting system.
Free Float Handguard eliminates loads from barrel, reducing the deflection for more accurate shooting.
Precision Machined Aerospace 6061-T6 Aluminum Alloy, for high strength and lightweight.
Proprietary engineered profile offers additional cross sectional strength.
Steel Barrel Nut (same KMR, MCMR, and QRF series), to resist movement under heat.
Hard Coat Anodized per Mil-A-8625F, Type III, Class 2
Handguard alone weighs 5.9 oz
Handguard mounting hardware 2.3 oz
Includes BCM M-LOK Compatible Sling Mount, (FREE for a limited time)
1.3" Inside Diameter
1.5" Wide