300 Blackout


Same Day if Ordered before 2pm EST

Tier 1 300 Blackout Ammo Specs:

  • Quantity: Boxes of 20rds
  • Bullet: Maker 200gr Rex SCHP - SUBSONIC
  • Velocity: 1050ft/s from an 8.33" Barrel 
  • Casing: Factory-new. boxer-primed brass

Important Notes

  • Designed to be subsonic in 7"-11" barrels, it will function in longer barrels but not guaranteed to be subsonic.
  • 300 Blackout functions reliably with Pistol gas length systems.
  • Minimum of 1:8 twist required to ensure projectile stabilization. 


The Maker Rex projectile is a precision CNC machined, lead free, solid copper expanding projectile. The Rex projectile expands to nearly 3 times the original diameter while maintaining nearly 100% of its original weight. Each Rex projectile has been engineered to provide unparalleled performance across a wide variety of calibers and weapons platforms. 

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All ammunition warranty claims are handled on a case-by-case basis. In order to initiate a claim, please contact our Customer Service Department at with your ammunition lot number and the details of your issue including the firearm make and model. NOTE: If you do not have the lot number we CANNOT process your claim. Be sure to retain lot numbers in the event there is an issue with your ammo. All Minuteman Munitions ammunition is warranted against material and workmanship defects for up to one (1) year from the purchase date. During the warranty period, we will (at our sole option) repair, replace or refund the purchase price of any defective part or product covered by this warranty when it is returned by the original owner with proof of purchase. All ammunition warranty claims must have a Return Authorization (RA) number assigned before acceptance at our facility for further examination. Please DO NOT send ammunition without obtaining a RA number from our Customer Service Department. NOTE: This warranty does not cover products damaged or rendered defective due to accident, misuse, abuse, modification, water damage, neglect, reloading, improper handling or storage, or failure to follow instructions for use. Prices and/or specifications are subject to change without notice. Warranty only valid to original purchaser if purchased through website or authorized dealer.
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