The Lancer L5AWM 30-round .300 Blackout magazine in opaque black is a hybrid AR magazine made by Lancer Systems (brand part no. 999-000-4280-04). It is engineered for heavy subsonic .300 Blackout ammunition of 200 grains and up, with updated internal geometry that lets longer bullets stack properly. The body is molded with .300 Blackout markings and a flat dark earth floor plate makes it easy to tell apart from 5.56 magazines. A one-piece wrap-around steel feed lip assembly adds durability. It is designed, tooled and made in the USA.

Key Specifications

• The caliber is .300 Blackout, optimized for bullets of 200 grains and heavier.
• Capacity is 30 rounds.
• The color is opaque black body.
• The floor plate is flat dark earth, giving a quick visual cue for .300 Blackout.
• The internal geometry is updated for longer bullets, reducing stacking problems seen in standard 5.56 magazines.
• The feed lips are a one-piece wrap-around steel assembly for durability.
• The body carries molded .300 Blackout markings for caliber organization.
• It fits M4/M16/AR-15, SCAR16, HK416, ARX160, SIG556, ACR and IWI Tavor systems, according to Lancer.
• It weighs about 0.3 pound, with dimensions of 1 by 3 by 8 inches.
• It is made in the USA.

Frequently Asked Questions

Should I use this with supersonic .300 Blackout ammunition? Lancer recommends a standard .223/5.56 L5AWM magazine for lightweight supersonic .300 Blackout ammunition under 150 grains. This magazine is built for 200-grain-plus subsonic loads.

How can I tell it from a 5.56 magazine? It has .300 Blackout markings molded into the body and a flat dark earth floor plate.

Which rifles does it fit? Lancer lists the L5AWM family as compatible with the M4/M16/AR-15, SCAR16, HK416, ARX160, SIG556, ACR, IWI Tavor and SA80 among others.

Buy the Lancer L5AWM 30-Round .300 Blackout Magazine, Opaque Black

If your .300 Blackout rifle chokes on subsonic ammunition, the magazine is the first place to look, and this one is built for the job. Order it from our Lubbock, Texas shop for fast direct shipping, and see more AR magazines while you are here.