A-Zoom Snap Caps Rifle 300 AAC Blackout/Whisper (7.62X35mm) Aluminum 2 Pk 12271 A-Zoom Snap Caps Are Perfect For Safety Training, Function Testing, Or safely decocking Without Damaging The Firing Pin. They Are Precision CNC-machined From Solid Aluminum To Precise Cartridge dimensions, then Hard-anodized For Ultra-Smooth functioning And Long Life. Each Round Has A-Zoom's Remarkably Durable "Dead Cap" proven To Withstand Over 3,000 Dry fires While protecting The Firing Pin. A-Zoom Snap Caps Last Over 30 times Longer Than Conventional Plastic examples. The A-Zoom Precision Rifle Snap Caps Are a Perfect Tool For adjusting And Tuning Trigger Pull, And They Help With Offhand Dry Firing And Smooth Bolt Cycling Practice. Type: Snap Caps Caliber Gauge: 300 AAC Blackout/Whisper (7.62X35mm) Rounds Per Box: 2 Pack Material: Aluminum