Hera Arms SFU Buffer Tube Folding Adapter Aluminum Black

HERA Arms AR15 Side Folding Unit Adaptor Black. They do not rely on a buffer/spring but rather the mechanical locking systems of the castle nut and bolt which are activated by a toggle switch on the charging handle. To utilize the locking system on a conventional semi-auto AR you will need a simple adaptor such as the MP5K or HK-style adaptor which then fits over the AR receiver. This allows the user to go from a semi-static position to a fully collapsed and locked position and deploy the SFU at the drop of a hat. They can then use any standard AR-15 SFP/SFU mechanism such as the MP5K or HK-style stocks but the inserts on the buffer and spring must match in thread count to be compatible. This is a threaded part so be aware that it might require some fine motor work to get it to lock into position. Specifications for HERA Arms AR15 Side Folding Unit Adaptor: Manufacturer: HERA Arms Condition: New Color: Black Gun Model: AR-15 Last Chance: Yes Package Contents: HERA Arms AR15 Side Folding Unit Adaptor HERA Arms HERA5-03: AR15 Side Folding Unit Adaptor Black