Unknown brand M4 stock kit (pre-owned)

Pre-owned in visibly used but functional/working condition. I think the receiver extension is LMT from the dry lube finish on the outside and the shape of the tube the holds the buffer detent down. The threads of the tube are in good shape. I do not know the make of any of the other peices. The endplate has been staked, the castle nut notches are worn and has scratches in the finish. The spring is a good length and not compressed, and the carbine weight buffer is also in good condition. The stock itself is in like new condition.