A rose by any other name would still smell as sweet, so what is an HK? Heckler and Koch! No... What I want to know is "What makes an HK, an HK?" Not the fact that is has the HK name. Not the fact that it has the stagg horn proof. Not the fact that it is what it is. The iconic MP5 A3 stock... pure HK. No other weapon is as easily identifiable. When you see the silhouette, you know what it is! Same way with a MK23. So parts or design make an HK what it is? One of the design features of their long guns and sub guns that says "Its an HK" is the roller delayed blowback. What about the 3 lug adapter on the MP5's? The PSG-1 grip? Let us know what you think HK's are KNOW for or are a MUST HAVE in the weapon. Imagine you are the new head designer and have to build a new or modify an existing design... what features would it need to have in order to be an HK authentic design?! I will say that there is a difference between handguns and long guns, so be specific! Have fun thinking about this and replying!