250mm length silencer for a 4.5mm / .177 air gun.
Has a 8mm hole in front, 50mm deep muzzle inlet w/ three small grub screws at the bottom for fastening the silencer.
Muzzle inlet is smooth, no threading.
Should fit a range of PCP rifles, including the PR900W. It will be necessary to check the vertical and horizontal leveling before tightening the grub screws