Starline Brass .300 Blackout/Whisper Unprimed Brass Small Cartridge Case, 100/bag - STAR300BLKEU

Name: Starline Brass .300 Blackout/Whisper Unprimed Brass Small Cartridge Case, 100/bag - STAR300BLKEU
Brand: Palmetto State Armory
Price: 38.29 USD
Availability: InStock

Sold byPalmetto State Armory•Posted May 18, 2026

$38.29

$42.99

You save $4.70 (11% off)

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Deal Summary

Currently in stock.
Caliber: 300blk
Category: parts
SKU: 794933
Brand: Starline Brass

Price History

Deal Details

The .300 Blackout is based off of a shortened 5.56x45mm case that is necked to .30 caliber. For AR-15 platform rifles and pistols it only requires changing the barrel to go from 5.56 to .300 Blackout. The Blackout's main purpose is to be used at subsonic velocities in suppressed firearms. Many bolt action and single shot rifles are now being produced in this caliber as well.