ACE ACE ARFX Stock, Rifle Length, Buffer Tube, 3 Sling Position, Does Not Include Spring or Buffer, Black A101B Doublestar-ACE's AR-15 ARFX Skeleton Stock with Buffer Tube is the standard length original Skeleton Stock. It is lighter than a standard A2 stock but provides you with a high level of strength and durability. The ARFX has 4 sling positions and a closed cell foam over tube that provides a comfortable cheek weld. This unit is the stock/buffer tube only and it does NOT include the buffer spring or the buffer.