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. RSR - CRKM16-01S