Laser Ammo 300 Winchester Rifle Adapter Small. 300 Winchester cartridge. The SureStrikeTM cartridge threads into the two piece adapter sleeve ensuring accuracy and eliminating the possibility of the adapter being left in the chamber. No tools needed. Specifications for Laser Ammo 300 Winchester Rifle Adapter Small: Manufacturer: Laser Ammo Caliber: .300 Winchester Magnum Quantity: 1 Features of Laser Ammo 300 Winchester Rifle Adapter Small: converts your 9mm cartridge to a 300 winchester rifle caliber Package Contents: Laser Ammo 300 Winchester Rifle Adapter Small 300WAR 300 Winchester Rifle Adapter Features/Specifications: convert your 9mm SureStrike to 300 Win caliber to use with your rifle Included Accessories: 300 Winchester Rifle Adapter