Lancer Tactical Brass Laser Bore Sight Cartridge ( 223 REM / 5.56 Nato )
Amazon.com : Laser Boresight for .223 Rem 5.56 mm NATO | Combat Veteran Owned Company | Zeroing Sight in with Rifle | Zero Bore Sighter Lasers for Rifles | 556 223 Boresighter Lazer : Sports & Outdoors
Amazon.com : Gotical 6.5 Creedmoor Red Laser Bore Sighter, Boresighter Anodized Red Battery Included Cartridge Bore Sight : Sports & Outdoors
20 Gauge Sight-Rite Chamber Cartridge Laser Bore Sighter by SME