ASF Magazine Company
This website is provided for informational purposes only. Product specifications and availability are subject to change without notice. Please review our Shipping Restrictions and Warranty pages before placing an order.
Anti-Spring Fatigue Rifle Magazine

PrecisionEngineered.Built to Last.

Experience the ASF Rifle Magazine, designed with a focus on long-term durability and reliability.

01 / 03 — Material
Duramide™ PA66

Fiberglass reinforced polymer for extreme durability.

02 / 03 — Patented
Telescoping Design

Relieves 50% spring tension of a fully-loaded magazine in storage.

03 / 03 — Capacity

Full Complement
  • 30 Rounds Capacity
  • 5.56mm / .223Rem
  • AR-Style Platform.

02 — The Magazine

The Must-HaveUltimate MAGAzine.

01 / 06 — Material

Duramide™ PA66 Body

Manufactured from premium Duramide™ PA66 fiberglass-reinforced polymer for exceptional strength and extreme durability.

02 / 06 — Exterior

Witness Holes

Molded round-count markings at 5, 10, 15 and 20 along the side of the magazine body.

03 / 06 — Internal

Custom Full-Size Spring

A patented, full-sized, custom magazine spring fully supports the follower, further preventing tilt and “nosediving.”

04 / 06 — Action

Snap Shut

Put into action in less than one second, delivering 100% spring power with a full complement of 30 rounds.

05 / 06 — Patented

Telescoping Sleeve

Relieves 50% spring tension of a fully-loaded magazine during storage and/or inactivity — equivalent to downloading a 30-round mag to 15.

06 / 06 — Platform

30 Rounds · 5.56 / .223

Built for the AR-style platform and currently offered in 5.56mm / .223 Remington.

Detail Views

Up close, from every angle.

Actual ASF Magazine photography. Select any view to open it full-screen.

Witness Holes 5 – 20

Curved body
Window, ribs & latches
Telescoping sleeve
SIZE & FIT COMPARISON
ASF vs. Traditional Magazine

LATCH DETAIL

Side Retention Mechanism

Witness Holes

10 & 15 Position Indicators

CAPACITY SCALE

15–30 Position Markings

CURVED BODY

Opposite-Side Profile

FEED-LIP GEOMETRY

Feed-Lip Comparison

The ASF Magazine Feedlips (right) are almost twice as thick as a major manufacturer’s magazine (left).  This area is where polymer magazines usually crack, break and fail.  The ASF Magazine clearly has a far more robust design without sacrificing efficient cartridge feeding.

MAGWELL INTERFACE

Installed Fit Close-Up
INSTALLED PROFILE
Seated Receiver Fit

Feedlip Fix

Modification: ASF Rifle Magazines undergo a special CNC modification of the feedlips. ASF Feedlips are manufactured almost twice as thick as other polymer magazine feedlips.

Problem: Polymer magazine feedlips may crack under prolonged spring tension, particularly when stored in areas experiencing extreme temperature fluctuations.

Solution: ASF Magazines feature a far more robust construction designed to ensure reliable functionality and long-lasting durability, even in the most adverse conditions.

03 — Engineered Differently

Designed withLongevity in Mind.

Discover the engineering philosophy behind ASF Rifle Magazines, with a focus on durability, thoughtful design, and long-term product life.

Spring Fatigue is that condition which occurs when a compression spring (in this case, a magazine spring) is completely compressed and remains in that state for extended periods of time. In layman’s terms, “the spring loses its springiness.”
And this is exacerbated when the magazine is stored in non-temperature-controlled locations, i.e., storage facilities, trunks of vehicles, garage safes, etc.

If you need to store your magazines fully loaded, THIS is the way to do it

01

Patented telescoping design

Relieves 50% spring tension of a fully-loaded magazine during storage and/or inactivity.

02

Equivalent to downloading

Like downloading a conventional 30-round magazine to 15 rounds — while keeping all 30.

03

Ready in under one second

Snap it shut for 100% spring power. It then functions like any conventional AR magazine.

Fig. 01 — Telescoping concept
30 RDSFOLLOWERSLEEVEEXTENDEDSPRINGCONCEPTUAL ILLUSTRATION — NOT TO SCALE
Spring tension
~50%
100%
Rounds loaded
30/30

Sleeve extended: spring tension relieved by about half for storage or lengthy inactivity.

Snapped shut: full spring power, delivered in less than one second.

Downloading vs. ASF

Spring tension relief
Conventional mag, downloaded 5 rounds
25 rds · 16% relief
Conventional mag, downloaded 15 rounds
15 rds · 50% relief
ASF Magazine in storage mode
30 rds · 50% relief

Figures as published in the official ASF FAQ.

Wide — Material
01

Duramide™ PA66

Manufactured with highest quality Duramide™ PA66 fiberglass reinforced polymer for extreme durability. Built like a tank — and engineered to last a lifetime, designed to be handed down to the next generation.

02

Patented Telescoping Sleeve

A movable sleeve relaxes the spring by about 50% during storage or inactivity — the same relief as downloading 15 rounds, without sacrificing ammunition that may be needed in a firefight.

03

Custom Full-Size Spring

A patented, custom full-sized magazine spring fully supports the anti-tilt follower, further preventing tilt and “nosediving.”

04

Ready After Years of Storage

User confidence that the ASF Magazine will function efficiently even after years of storage — then close it up for 100% spring power in under a second.

01 / 04
LIFETIME
05 — Built for the Long Term

ConfidenceThat Lasts.

ASF stands behind its magazines with a LIFETIME WARRANTY, reflecting its commitment to product quality and long-term ownership.

The magazine of choice for law enforcement, preppers & prepared firearms enthusiasts

01

Any time. Any purchase date.

If an ASF Magazine fails — regardless of the date of purchase — send it back and it will be replaced free of charge, return postage paid.

02

Every failure, studied.

ASF asks exactly how it happened — rifle or SBR, ammo, conditions — to duplicate the issue and fix it so it never happens to another customer.

03

Covers reasonable use.

Professionals take care of the gear they stake their lives on. Deliberate destruction and unrealistic “torture tests” are not covered.

04

Damaged in shipping?

Return it immediately and ASF will replace it without delay, free of charge, no questions asked.

We designed the ASF Magazines to last a lifetime. We fully expect you to hand them down to your children.

— ASF Magazine Warranty
06 — American Made

Proudly Madein the USA.

Designed and engineered by U.S. Special Ops Marines and Law Enforcement — and manufactured here at home, by people who have relied on magazines when it mattered most.

Process

Manufactured in bulk by injection molding — only after being proven on a live range.

Locust, North Carolina
Anti-Spring Fatigue (ASF) Rifle Magazine Company, LLC
Engineered by
U.S. Special Ops Marines & Law Enforcement
Material
Duramide™ PA66 fiberglass reinforced polymer
U.S. Patents
Nos. 10,527,374 & 10,690,427 · third pending
08 — Our Story

InnovationRooted inExperience.

Every person involved is a firearms enthusiast — with more than 150 years of combined experience, and service across branches of the U.S. Armed Forces and Law Enforcement.

Gunnery Sergeant Rob August
USMC (1984–2004, Retired) · Inventor / Owner

“Manufacturing and providing this unique magazine is all we do; and all we want to do.”

1984

Naval Air Station Adak, Alaska

A working party is called up to swap old ammo out of magazines staged fully-loaded in footlockers for years. Scores of the 30-round mags — many brand-new — had fatigued springs, rendering them useless.

1984 — 2004

Two decades of “Bang, Bang, Click.”

Through 20+ years in the Marines, founder Gunnery Sergeant Rob August repeatedly encountered spring fatigue in magazines kept fully loaded at all times. The question stuck: “There’s gotta be a better way!”

Concept

A movable sleeve

The answer: a magazine with a movable sleeve that relaxes spring tension during storage or lengthy inactivity, yet can be put into action instantly with full spring power.

Patents

Shop prototypes & two U.S. patents

After several prototypes made in the shop, the team applied for and received two patents from the U.S. Patent Office — Nos. 10,527,374 and 10,690,427.

Validation

Polymer, simulation, and the range

3D-printed prototypes resolved the translation from metal to polymer. Magazine dynamics were tested with computer simulation, then run through their paces on a live range. A third U.S. patent is pending.

Production

Injection-molded in bulk

Only after being proven efficient and effective were ASF Magazines manufactured in bulk using the injection-molding process — in Duramide™ PA66 nylon polymer.

0 %
Spring tension relieved in storage
0
Rounds — a full complement
0 +
Years combined firearms experience
0
U.S. patents issued, third pending
09 — FAQ & Information

Questions,answered.

Straight answers drawn from ASF’s published product information. For anything else, the team is an email away.

Your credit card is not charged until your order is shipped

The ASF Magazine does one thing other magazines can’t: its patented telescoping design relaxes a fully-loaded magazine spring by about 50% during storage — as if you’d downloaded it by 15 rounds. When you need it, simply snap it shut for full spring power, and it functions like any other conventional AR magazine. It’s built from Duramide™ PA66 fiberglass reinforced polymer with a custom, full-sized spring.

Read the full FAQ

If, at any time — regardless of the date of purchase — an ASF Magazine fails, send it back and ASF will replace it free of charge, return postage paid. ASF will ask exactly how the failure occurred (rifle/SBR, ammo, conditions) so it can be duplicated and fixed. The warranty covers reasonable use, not deliberate destruction or “torture tests.”

Official warranty details

ASF Magazines are proudly made in the USA. They were designed and engineered by U.S. Special Ops Marines and Law Enforcement, and are produced by injection molding. Anti-Spring Fatigue (ASF) Rifle Magazine Company, LLC is located at P.O. Box 263, Locust, NC 28097.

About the company

Please check the Shipping Restrictions page before ordering. ASF cannot ship to certain cities/states on the Restricted Shipping List, and orders placed in one of the Restricted Areas will be canceled. If a magazine is somehow damaged during shipping, return it immediately for a free replacement — no questions asked.

View shipping restrictions

Currently the ASF Magazine is offered only in 5.56mm / .223Remington for the AR-style platform — the most popular caliber and platform in the USA. Other calibers and platforms may follow as the shooting community demands.

Read the full FAQ

With the spring relaxed 50%, the conditions required for spring fatigue to occur are not met — not even close. Theoretically, the magazine should last a lifetime under normal use. ASF wouldn’t be surprised if you pass them on to your kids.

Read the full FAQ

Email asfmagazinecompany@gmail.com, or write to P.O. Box 263, Locust, NC 28097. A feedback form is also available on the official contact page.

Contact ASF

The short answer is, the most popular AR-platform rifles. With firearms tolerances being what they are, the ASF Magazine should run flawlessly on your rifle as well. Here’s a short list:

Anderson, Bushmaster, CMMG, Colt, Del-Ton, Diamondback, DMPS, FN, Franklin Armory, Palmetto Arms, Ruger, and Smith & Wesson.

10 — The ASF Difference

Discover theASF Difference.

Explore the engineering, design, and philosophy behind ASF Rifle Magazines.

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