AR-15 Magazines 101: PMAG vs. Metal, Capacities & What to Buy
The magazine is the #1 cause of rifle malfunctions — and the cheapest insurance against them. You can own the nicest AR-15 on the block, but feed it tired or bargain-bin mags and it will choke. The good news: quality magazines are inexpensive, and knowing a few basics will keep your rifle running. Here is the beginner's rundown.
Polymer vs. aluminum — which should you buy?
Polymer (e.g. Magpul PMAG)
Modern polymer magazines are the default for good reason: they resist dents, won't corrode, have anti-tilt followers for reliable feeding, and survive being dropped on hard surfaces. They flex instead of bending. For most shooters, a polymer PMAG-style mag is the easy, reliable choice.
Aluminum (USGI)
The original GI-style aluminum mag is light and proven, and runs great with an upgraded anti-tilt follower. The weak point is the feed lips, which can bend if dropped loaded. They are inexpensive and fine for range use — just inspect them and replace any that take a hard hit.
5.56 vs. .223 — does the magazine care?
The magazine feeds either cartridge the same; the difference that matters is in your chamber, not the mag. A 5.56 NATO chamber safely fires both 5.56 and .223; a .223-only chamber should stick to .223. Standard AR-15 magazines handle both rounds without issue.
Capacities & restricted states
- 30-round: the standard-capacity AR-15 mag and what most shooters use.
- 20-round: handy for shooting prone or off a bench.
- 10-round: required in several restricted states — same reliability, lower count.
Know your state law. States including California, New York, New Jersey, Connecticut, Massachusetts, and others limit magazine capacity. Always confirm your local and state rules before ordering, and choose 10-round versions where required.
What makes a magazine reliable
- Anti-tilt follower that won't nose-dive and cause feeding stops.
- Strong spring that maintains pressure even when stored loaded.
- Solid feed lips — polymer or reinforced metal that holds shape.
- A floorplate you can remove for cleaning and spring maintenance.
How many do you need?
A practical baseline is six to ten quality magazines: a couple for range practice, a few in rotation, and several set aside in reserve. Mags are consumable — buy good ones, label your range mags, and retire any that cause repeated malfunctions.
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Frequently asked questions
Is it bad to store magazines loaded?
No. Quality magazine springs are designed to be stored loaded for long periods. It is the cycling and abuse, not resting under load, that wears a good spring.
Will any AR-15 mag fit my rifle?
Standard AR-15 / M4 pattern magazines fit the vast majority of 5.56/.223 rifles. Some specialty lowers differ, so confirm your platform if you are unsure.
How do I maintain my magazines?
Occasionally disassemble, wipe out dust and grit, and check the spring and follower. Keep them dry. Avoid oiling the inside — oil attracts grit that causes feeding issues.
Need help choosing compliant magazines for your state? Email info@taktactical.com or call (954) 487-9799.