Magtech First Defense .300 AAC Blackout 123gr FMJ

The Magtech First Defense .300 AAC Blackout 123-grain FMJ (Magtech part no. 300BLKB) is a value-priced full metal jacket rifle round built for recreational target shooting and training. Magtech built its First Defense line to deliver consistent, reliable performance without the premium price tag of defensive or match-grade ammunition. The 123-grain FMJ bullet is a standard supersonic weight for .300 Blackout, giving reliable cycling in semi-auto AR-platform rifles. Loaded on a brass case, it’s a practical choice for high-volume range days in .300 Blackout.

Key Specifications

• Chambered in .300 AAC Blackout.
• Loaded with a 123-grain bullet, a standard supersonic weight for the caliber.
• Uses a full metal jacket bullet for reliable function.
• Built on a brass case for consistent extraction.
• Ships in a box measuring approximately 3.9 inches in length.
• The box weighs approximately 1.71 lbs.
• Priced at roughly $0.76 per round.
• Packed 50 rounds per box.
• Designed for recreational target shooting and training without sacrificing quality.

Frequently Asked Questions

What is this ammunition best used for? Recreational target shooting and training in .300 AAC Blackout rifles.

What bullet type does it use? A 123-grain full metal jacket.

Buy the Magtech First Defense .300 AAC Blackout 123gr FMJ

Order this Magtech First Defense load from our Magtech Ammunition lineup in our rifle ammunition selection, and our Lubbock, Texas team will get it shipped out promptly.