Rifle stock band that will fit over the FX Streamline's stock as well as the reservoir with it, thereafter, capturing the barrel itself.
Under the stock, there is a weaver rail for mounting for either a bipod (suggested) or an optic such as a flashlight or a laser kit. This weaver rail itself only has one through-slot w/ a positive backstop. There is no retention on this bipod band's lower save for the clamp force exerted by one's choice of attachment - that retain this part around the stock and reservoir. There is no bolt / through-hole between the stock and barrel cut-out slots to exert a tighter clamp on the rifle barrel.
Wall width: 3mm
Separation/border between the barrel and reservoir at its middle / thinnest point: 1.6mm
Length of part: 40mm
Understock weaver crevice/clamping tolerance: 2.05mm
Total height of part: 91.7mm