Selling my turn key drop in Leber V2 lower for the Mp5k. Was specifically in my ptr9k. Has metal insert, S7 Super safety from GreyMarket Research, and Modified Hk oem ejector lever. It ran perfect in safe, semi, and frt mode without a hiccup. Its ready to drop in nothing else needed. I can throw in a cnc steel slip trip for 50$ if interested. For your upper I do recommend having an hk extractor and  pin and different locking piece for fast rate of fire or suppressed. Bottom ear on one side is broken from me shoving into the upper receiver but does not affect function only cosmetic. Only selling because I got a drop in trigger for sef lower.