Shop › CMMG HANDGUARD SLIP RING KIT CMMG HANDGUARD SLIP RING KIT $13.99 CMMG Hand Guard Slip Ring Kit, Includes Slip Ring, Spring, and Retaining Ring, Black 55DA2CF Add To Cart Added! CMMG Hand Guard Slip Ring Kit, Includes Slip Ring, Spring, and Retaining Ring, Black 55DA2CF