MP5 HK 3 point Sling Green Black

How to fit the sling ( I preferer the first method)

https://youtu.be/RUzJdM9Xkdk?si=gVQU69JofTvM-I92

https://youtu.be/mHqJqDN6N-E?si=ne1n6qsF8Wv8Mtk0