Modular Rear Kalashnikov Trunnion for AKM/AK-74 THIS IS FOR THE TRUNNION ONLY, ADAPTERS SOLD SEPARATELY JMAC's Modular Rear Kalashnikov Trunnion is designed to allow the installation of 1913 rails, M4 Stocks, ACE/Stormwerks Hinges and stocks, and in the near future wood stocks from IronWoodDesigns! It Replaces your current Rear Trunnion and has adapters to allow you to use the majority of the stocks on the market!! Go ahead and stake that castle nut because you don't need to disassemble the buffer tube to swap adapters! The bolt threads into the adapter from the inside of the receiver! You can swap back and forth between stocks in under 1 min! These wil Mfg: Jmac Customs