Lancer Systems L5 Advanced Warfighter Magazine — .300 Blackout, 20 Rounds, AR-Platform, Opaque Black Polymer (999-000-4280-05 • 428005 • UPC 738435619503)
Carry lighter, feed smoother, and track round count with confidence. The Lancer Systems L5 Advanced Warfighter Magazine (L5AWM) is purpose-built for .300 Blackout in a compact 20-round configuration that runs reliably in AR-pattern rifles. Engineered with Lancer’s hybrid design DNA, the L5AWM combines impact-resistant polymer construction with steel-reinforced feed lips (Lancer hallmark) to deliver durability, consistent geometry, and long service life—even through hard training cycles and field conditions. The opaque black finish keeps your setup discreet while maintaining the Lancer reputation for slick feeding and easy maintenance.
Why Choose the Lancer L5AWM for .300 BLK
.300 Blackout specific: Internal geometry is tuned for .300 BLK cartridges to promote reliable stacking, smooth feeding, and proper presentation angle.
20-round sweet spot: Shorter profile improves prone/barricade clearance and reduces weight without sacrificing practical capacity.
Hybrid toughness: Steel-reinforced feed lips resist spread and deformation; polymer body absorbs drops and impacts.
AR-platform compatibility: Designed to fit AR-15/AR-pattern magwells for .300 BLK builds (verify your rifle’s chambering).
Weather & chemical resistant: Polymer body shrugs off temperature swings, common gun cleaners, and field grime.
Low-profile, duty-ready look: Opaque black body for a clean, non-reflective presence on the range or in the field.
Key Features at a Glance
Caliber: .300 AAC Blackout
Capacity: 20 rounds
Platform: AR-15/AR-pattern rifles chambered in .300 BLK
Body Material: Impact-resistant polymer
Feed Lips: Steel-reinforced for long-term dimension stability
Follower: Anti-tilt design for consistent feeding
Spring: Stainless-steel spring for corrosion resistance and dependable cycling
Color/Finish: Opaque black
Model / MPNs: 999-000-4280-05 / 428005
UPC: 738435619503
Built for Real-World Use
Prone & bench-friendly: The 20-round length clears bipods and bags while keeping the rifle low and stable.
Training-proof: Reinforced lips and rugged polymer handle mag changes on concrete, gravel, or cold weather without losing shape.
Maintenance made simple: Disassembles easily for cleaning; flush debris, wipe, reassemble, and go.
Compatibility Notes
Rifles: Works with most AR-15 pattern lowers built for .300 Blackout.
Ammunition: Designed for .300 BLK (subsonic and supersonic). Do not load 5.56/.223 into .300 BLK-marked magazines for mixed-caliber ranges—clearly label to prevent cross-chambering.
Pouches & carriers: Standard AR magazine pouches typically fit 20-round Lancer mags; check retention.
Ideal Use Cases
Hunting & field carry: Lighter mag with lower profile for brush, blinds, and night setups.
Range & training: Durable construction built to withstand frequent reload drills.
Home & truck rifle setups: Reliable feeding in compact configurations with .300 BLK loads.
Safety Tip: To prevent ammunition mix-ups, mark .300 BLK magazines clearly and store separately from 5.56/.223 magazines.
Specifications
Brand: Lancer Systems
Series: L5 Advanced Warfighter Magazine (L5AWM)
Caliber: .300 AAC Blackout
Capacity: 20 rounds
Body: Polymer, opaque black
Feed Lips: Steel-reinforced
Follower: Anti-tilt
Spring: Stainless-steel
Platform: AR-15/AR rifles chambered in .300 BLK
Model Numbers: 999-000-4280-05 / 428005
UPC: 738435619503
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SEO Title: Lancer L5 Advanced Warfighter Magazine — .300 Blackout, 20-Round, AR-15, Opaque Black (999-000-4280-05 / 428005)
Meta Description (≤160 chars): Lancer L5AWM .300 BLK 20-round magazine for AR rifles with steel-reinforced feed lips, opaque black polymer body, anti-tilt follower.
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Alt Text (Images): “Lancer L5 Advanced Warfighter .300 Blackout 20-round opaque black AR-15 magazine with steel-reinforced feed lips.”
FAQ
Q: Will this work in a 5.56/.223 AR-15?
A: It is designed for .300 Blackout. While the mag may fit the well, do not use with 5.56/.223 ammunition. Clearly label mags to avoid cross-chambering.
Q: Is the body translucent?
A: No—this model is opaque black. Lancer offers translucent versions in other SKUs.
Q: Can I run subsonic ammunition?
A: Yes—this magazine is built for .300 BLK and is commonly used with both subsonic and supersonic loads. Always test your specific ammo/rifle combo.
Q: Does it have an anti-tilt follower?
A: Yes, the L5AWM includes an anti-tilt follower and stainless spring for consistent feeding.
Q: How do I clean it?
A: Disassemble carefully, rinse out debris, dry completely, lightly wipe, and reassemble. Avoid harsh solvents that can attack polymer components.
Reliable, durable, and ready for real-world .300 Blackout builds—the Lancer Systems L5AWM 20-Round Magazine (999-000-4280-05 / 428005) pairs steel-reinforced feed lips with an opaque black polymer body to deliver smooth feeding, easy maintenance, and long service life for your AR-platform rifle.
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