Needs a lot of filing down before it Fits arp9 and then there is still a 0.5 CM Gap in between stock and fat part of drop stock.
Team P6
Hello, Michael, In order to fit perfectly, the assembly need some modifications on some M4 AEG lower receiver to adapt perfectly the Dropstock. In the case of ARP9, the rear part of the lower receiver (that receive the stock tube) need to be recut in order that the dropstock fit perfect and it will delete the GAP with lower fat part. it is impossible to build a plug and play product for alls M4's as the rear part of AEGs lower receivers are all differents size. We stay available for any questions regards.