This modular stock was designed to fill a (small) void in the market for a low-cost, lightweight PRS style modular stock especially suited for airguns and rimfire enthusiasts. This stock is not just affordable, but packed with unique features. It is the only pic clamping PRS style stock on the market. It uses a unique cam lever design to make it quick and easy to install and take down without tools. The adapter can be changed out to adapt the stock to standard bufferless threaded receivers with full end plate geometry or with non-standard airgun threaded receivers that often don't use end plates. Will work on the following airguns: Air Venturi MicroStrike Air Venturi Alpha Barra 250z RAW Mini RAW MicroHunter UX Notos (with Buck Rail Grip Adapter) and more... Cheek riser height - up to 3/4 inches Butt length extension - up to 1-1/4 inches Butt height - as high as 3/4 inches and as low as 1-1/4 inches Since all of the hardware and dowel pins are common off the shelf items these can be customized with longer vented threaded dowel pins.