It is a very reliable design. I have a genuine (full auto, suppressed) MP5SD3 that is an absolute bullet hose, but that integral suppressor sure gets hot!
I’m not envious about much. . .
I bought my 1st HK(93) in Jr. Hi School for $500.00. Those were the days.
As for the integral suppressor heat, could a silicone-based shield be incorporated? The HK design aint the best at heat dissipation, I’m painfully well aware. Its a low-profile material, with grip properties, melt-point would have to be determined, could be tested by going to WalMart and by picking up a silicone oven mitt. I’m a baker/clinger/-neck so the idea is kinda 2+2.
the Deets