AR-15 Magazines
Magpul PMAG • STANAG-Spec • 5.56 / 300 BLK / 6.8 SPC • 5-100 Round
One of the deepest AR-15 magazine catalogs on the market — Magpul PMAG Gen M2, Gen M3, D-60 drum, and translucent window variants; Ruger SR-556 magazines in 5.56, 300 Blackout, and 6.8 SPC; ETS, Duramag, Hexmag carbon fiber, MFT Extreme Duty, ASC stainless steel, C Products Defense, Amend2, UTG, Hera, Ultimag, KCI 100-round drums, Schmeisser 60-rounders, and state-compliant 5-round and 10-round options. Every capacity from compact 5-round blind-mag hunters to 100-round drums, in polymer, aluminum, stainless, and carbon-fiber construction.
AR-15 Magazines at Keep Shooting
Keep Shooting carries one of the deepest AR-15 magazine catalogs available on the US market — more than three dozen distinct magazines spanning every major manufacturer, every common AR-15 caliber (5.56×45mm NATO / .223 Remington, 300 Blackout, 6.8mm SPC, and even .22 LR rimfire conversion), every capacity from 5-round state-compliant magazines through 100-round drums, and every construction material from original-pattern aluminum and stainless steel to modern polymer and carbon-fiber. Whether you are building a dedicated precision upper, a competition carbine, a state-compliant hunting AR, a home-defense 300 Blackout SBR, or a three-gun race rifle, we stock the right magazine for the application.
AR-15 magazines descend from the original 20-round aluminum magazine Eugene Stoner and ArmaLite designed for the AR-15 prototype in the late 1950s, which was upsized to 30 rounds during the Vietnam War and has remained the dimensional baseline for every AR-15 and M16 magazine since. In October 1980, NATO proposed Draft Standardization Agreement (STANAG) 4179 to formalize the M16 magazine's external dimensions as the common magazine standard for all NATO service rifles — so that NATO allies could share ammunition and magazines down to the individual rifleman level. Although STANAG 4179 was never formally ratified (it remains a "draft" to this day), the dimensional specification has effectively become the universal standard that governs every modern AR-15 magazine produced anywhere in the world. Any magazine marketed as "STANAG-compliant" or "USGI pattern" is built to that same 1980 draft dimensional envelope.
The modern AR-15 magazine market was revolutionized in 2007 when Magpul Industries released the PMAG — a reinforced-polymer magazine with self-lubricating follower, impact-resistant feed lips, and a four-way anti-tilt geometry that addressed every systemic weakness of the original aluminum USGI magazine. Soldiers and Marines in Iraq and Afghanistan found the PMAG dramatically more reliable than the early aluminum STANAG magazines, which were prone to bent feed lips, side-impact damage, and follower-tilt stoppages. By the time the Gen 3 PMAG launched in 2013 — with updated dot-matrix pattern, aggressive feed-lip reinforcement, and broad cross-platform compatibility with the HK 416, FN SCAR MK16, SA-80, and Beretta ARX-160 — US military testing at Aberdeen Proving Ground recorded over 30,000 rounds between magazine- related stoppages. The PMAG is now the standard against which every other AR-15 magazine is benchmarked, and we stock the full Magpul lineup: Gen M2 (original formula), Gen M3 (current-generation), M3 Window (translucent witness windows), TMAG M3 translucent, the compact 20-round Gen 3, 10-round Gen 3 for state-restricted markets, the 40-round PMAG, and the 60-round D-60 drum.
Beyond Magpul, our catalog covers the full current landscape of AR-15 magazine manufacturers. Ruger produces SR-556 steel magazines in dedicated 5.56, 300 Blackout, and 6.8mm SPC variants — the correct choice for anyone running a Ruger SR-556 piston upper or building a caliber-specific upper where dedicated magazine labeling prevents mix-ups. Elite Tactical Systems (ETS) manufactures translucent polymer magazines with integrated side-coupling designs. Duramag offers value- tier polymer magazines in distinctive colors. Mission First Tactical (MFT) makes the Extreme Duty series, including window variants and the Gadsden Flag commemorative edition. ASC produces stainless-steel magazines with high-visibility orange followers — a legacy machined-steel option favored by some precision shooters. Hexmag's signature hex-panel polymer design is available in both standard polymer and a carbon-fiber-reinforced variant. Hera Arms' H3T Gen-2 is a German-engineered alternative polymer magazine. Amend2 produces budget-tier polymer magazines in both 30- and 20-round configurations. UTG makes a window-equipped polymer magazine, Ultimag specializes in ultra-compact 10-round magazines, and C Products Defense produces both stainless and aluminum STANAG-pattern magazines. For drum magazines, we carry both the legendary Magpul D-60 and the higher-capacity KCI 100-round drum magazine. The T91 magazine cross-fits from the Taiwanese T91 service rifle into STANAG-pattern AR-15 receivers, and the Schmeisser S60 is a 60-round German-engineered stacked-column polymer magazine — the highest- capacity box-format AR-15 magazine on the market.
Our magazine selection covers caliber applications far beyond standard 5.56 NATO. The Ruger SR-556 300 Blackout magazines are purpose-built for the 300 BLK cartridge, which uses the same 5.56 parent case necked up to .30-caliber and runs reliably through STANAG-pattern magazines but benefits from dedicated magazine labeling to prevent cross-chambering with 5.56 uppers. The Ruger 6.8mm SPC magazines are true caliber-specific mags — 6.8 SPC uses a wider case and REQUIRES a 6.8-specific magazine (standard 5.56 mags will not feed 6.8 reliably). The Walther Colt M4 .22 LR Magazine is a dedicated rimfire magazine for the Colt/Walther .22 LR AR-15 conversion — the factory-authorized magazine for training and plinking on a rimfire-converted lower.
Magazine capacity and state compliance: There is currently no federal restriction on magazine capacity — the 1994 Federal Assault Weapons Ban's 10-round limit expired in 2004 and has not been renewed. However, as of 2025, fourteen states plus the District of Columbia restrict magazine capacity under state law. The most common limit is 10 rounds, enforced by California, Connecticut, Hawaii, Maryland, Massachusetts, New Jersey, New York, Vermont (rifle), Washington, and the District of Columbia. Colorado caps magazines at 15 rounds. Delaware caps at 17 rounds. Illinois also has restrictions. Restrictions vary in enforcement — some states ban possession, some ban only sale/transfer, and some grandfather previously-owned magazines. We ship 5-round and 10-round magazines to customers in all 50 states; larger-capacity magazines are shipped only to addresses in non-restricted states, and customers are responsible for verifying their local magazine-capacity law before ordering. For state-compliant options we recommend the PMAG Gen 3 LR/SR 10-Round, the Ruger SR-556 5- and 10-Round, the Magpul PMAG 10-Round, and the Ultimag 10-Round — all built on purpose-engineered blocked or short- body bodies rather than dremeled aftermarket limiters.
Magazine construction choice is worth thinking through before ordering. Polymer magazines (Magpul, Hexmag, Amend2, Duramag, ETS, MFT, Hera, UTG, Schmeisser) are the modern standard — lighter, more impact-resistant, better thermal-cycling behavior, and generally more reliable than aluminum. Aluminum magazines (C Products Defense aluminum) are the historical original and remain common in military bulk issue; they cost less per unit but require more care to avoid feed-lip damage. Stainless steel magazines (ASC, C Products Defense stainless) are the heaviest and most durable option — favored by some precision shooters and by users in corrosive environments where aluminum would pit. Carbon-fiber- reinforced polymer (Hexmag carbon fiber) sits at the top of the polymer tier for stiffness- to-weight ratio. Translucent-window polymer (PMAG M3 Window, PMAG M2 Window, MFT Window, UTG Window) lets you visually verify round count at a glance without removing the magazine.
Keep Shooting ships all AR-15 magazines from our Pennsylvania warehouse with free shipping on orders over $49.95 and hassle-free returns. Whether you are stocking up a basic training-rifle magazine pool, building out a caliber-specific upper in 300 Blackout or 6.8 SPC, assembling a state-compliant 10-round magazine loadout for hunting or range use in a restricted jurisdiction, running 100-round drums for a competition or suppressed carbine, or simply maintaining a reliable mix of Magpul PMAGs and USGI-pattern aluminum magazines for an AR-platform rifle, every magazine in our catalog is genuine factory-direct inventory from authorized manufacturers.
Frequently Asked Questions — AR15 Mags
Keep Shooting carries a wide selection of AR15 Mags products from trusted brands. Browse our catalog to see the full range, and use the filters on the left to narrow by brand, price, or product type.
Yes! All orders over $49.95 qualify for free shipping, including AR15 Mags products. Orders typically ship within 1–2 business days.
Keep Shooting offers hassle-free returns on AR15 Mags products. If you're not completely satisfied, contact our customer service team for a return authorization. All products must be in original, unused condition.
If you need help choosing the right AR15 Mags product, our team is available to assist. Check individual product descriptions for detailed specifications, or contact us directly and we'll help you find the best fit for your needs.