Design only to fit AirForce Big Bore Air Rifle Texan 457 Caliber Air Rifle PCP .457. Will add 7.5 to over all length, weight 1.232 and Back yard friendly. Very easy to install. Just loosen one screw, slide over the end of the barrel and tighten the screw. DISCLAIMER: This product are INTENDED for the use on airguns only. It is a violation of Federal law to use this product in a manner inconsistent for which it was intended for. Read more on the court ruling between airgun suppressor and firearm suppressors. It is your Responsibility to know the laws in your state, county and city and to fully comply with them.