The Echo1 M4CQB XK End Cap with Sling Swivel is a replacement if yours has become damaged or you want to change the look of your M4. This item may work with other guns but can not be guaranteed by AirsoftGI.
Model: M4CQB XK End Cap with Sling Swivel
Package Includes: One (1) M4CQB XK End Cap
- OEM Replacement Part
- Works with Echo1 M4CQB XK
- Durable Construction