Steve MP5 shows an MP5 PDWC Telescoping Stock available at HKParts that can allows you use this more compact stock that you see in the HK416C and other AR-style rifles. We wonder if this can readily fit airsoft MP5Ks which are mainly based on the Marui AEG version.. "Brand new from HKparts.net are the MP5 PDW series collapsable stocks! I needed to do zero modifications for the pins to line up and fit. Big thanks to Adam at HKparts for making this happen."