The UBR stock is an exceptionally high quality stock made with many uses in mind. The stock is collapsible, meaning you can extend and shorten the stock when needed. The advantage the UBR brings compared to other collapsing stocks on the market is that it offers the stability of a fixed stock with a cheek weld in any of the 7 positions the stock can lock into. The UBR also has a storage compartment and also has QD mounting points.
Fits both aeg and gbb as comes with both buffer tubes.