If you're like me, for years I've looked at HKParts abd dreaded paying their over the top prices for a picatinny rail for your MP5/K, but dread no more! I printed mine in ABS-GF with 100% infill, I am pretty happy with the quality so far. I plan to stress test it a bit in the near future, but nonetheless its a cheap part that should just work! an M6-1mm x 40mm pan head bolt and a black nylock nut will make up for the lack of a front pin! If you have any questions feel free to reach out!