Joseph - From Tailhook's web site: "Tailhook MOD 2 takes the pistol brace concept to a whole new level with it's ability to telescope the length. The key to this is our Patented proprietary telescoping latch mechanism giving the user 5 positions of use up to a 12.75" LOP. Combine that with the also Patented brace functionality and you have the new king of the market. The brace is injection molded out of reinforced polymer for rigidity and strength. It provides the perfect balance between size, weight, comfort and rigidity that everyone has been wishing for. A heavyweight with features all at featherweight mass, the 6.7 ounce* Tailhook MOD 2 is the clear winner.
As with all it's siblings, the MOD 2 uses the same fold out arm to create the support shelf that inspired the Tailhook name. This counteracts the muzzle weight of your favorite large handgun. The telescoping feature lets you find that sweet spot for balance. As an added feature, the outsides are smooth for comfortable cheeking. There is even a web sling loop." Nice brace on this one Joseph.

if you are asking about this gun budsgunshop.com/catalog/product_info.php/products_id/104090/cmmg+mk4+banshee+pstl+8+300blk+blk its a Tailhook MOD 2 Pistol Brace it is extendable "Tailhook MOD 2 takes the pistol brace concept to a whole new level with it's ability to telescope the length. The key to this is our Patented proprietary telescoping latch mechanism giving the user 5 positions of use up to a 12.75"

Joseph, thanks for re-posting Sir. The Gear Head Works Tailhook MOD 2 pistol brace is adjustable. Details video here : youtube.com/watch?v=PhklQOnPrHw