[deezgunz]

In the pics of the HK uppers I've seen it appears there is a round slingpoint attachment on the side of the rail system. Is it possible to pop in a KAC ballcock swivel eyelet in the round slingpoint attachment on the side of the rail system and use a g36 type sling?

 

[HKPRO]

You don't need to. Just attach the front end to the attachment point.