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M1 Carbine 30-Round Magazine

The United Defense M1 Carbine 30-Round Magazine is a high-capacity feeding solution patterned after the original USGI "banana" magazine used in the M1 and M2 Carbines. Built from heat-treated high-carbon steel with a protective black oxide finish, it holds 30 rounds of .30 Carbine and drops into any USGI-spec carbine without modification. The curved body, proper spring tension, and clean feed lips deliver the reliable cycling you expect from a mil-pattern magazine. A solid choice for range shooters, collectors, and anyone running an M1 Carbine who wants extended capacity at a working-man's price.

In stock

SKU
IMP-0005
$19.95
  $14.95
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Description

Features

  1. 30-Round Capacity — Doubles the standard 15-round loadout for extended range time and fewer reloads between strings.
  2. .30 Carbine Chambering — Designed specifically for .30 Carbine ammunition and patterned after the original USGI M2 Carbine magazine.
  3. USGI Pattern Fit — Drops cleanly into any M1 or M2 Carbine built with USGI parts or to original military specifications.
  4. Heat-Treated Steel Body — Constructed from high-carbon, heat-treated steel for long-term durability under hard use.
  5. Black Oxide Finish — Corrosion-resistant black oxide coating protects the body and gives the magazine a clean, military-style appearance.
  6. High-Tensile Spring — Properly tensioned spring delivers consistent feeding pressure from the first round to the last.
  7. Curved "Banana" Profile — Classic curved geometry that mirrors the original wartime 30-round mag for reliable cartridge stacking.
  8. Bolt Hold-Open Compatible — Works with carbines featuring the late-pattern bolt hold-open follower for faster reload cues.
  9. Easy Loading — Smooth feed lips and follower geometry make topping off to full capacity quick and painless.

More Information

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Customer Reviews

4.9

45 reviews

100% of customers recommend this product

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Top customer reviews

  1. Taylor 88

    Verified Buyer

    USGI-spec mags

    Value

    Overall Rating

    Price

    Quality

    Been collecting Carbines for about 15 years now and I've cycled through every mag option out there. Original USGI mags are 70+ years old at this point and you're rolling the dice on feed lips that may or may not have been abused over the decades. The KCI Korean mags are decent and I run a few of those, but these KeepShooting MIL-SPEC mags are something else entirely. You can tell they're built to the original specs - the follower engages the bolt hold-open like it should, and the weld seams are clean. Loaded up 30 rounds of Aguila and ran two mags through my IBM last weekend without a hitch. The parkerized finish matches my vintage mags almost perfectly. Yeah they're a few bucks more than the KCI stuff but you're getting genuine USGI-spec construction here. Already ordered three more.
  2. Graps

    Verified Buyer

    Excellent Quality for the Price

    Value

    Overall Rating

    Price

    Quality

    I was looking for a reliable 30-round magazine for my USGI-spec M1 Carbine and this one exceeded my expectations. The all steel construction with the blued finish looks great and matches the classic military look of the rifle and it feeds every round of .30 Carbine smoothly in both slow and rapid fire.
  3. GunNut308

    Verified Buyer

    These mags are g2g!

    Value

    Overall Rating

    Price

    Quality

    I was skeptical about aftermarket 30 rounders but these run like a sewing machine. Put 200 rounds of Tula steel case through one mag and not a single hiccup. Bought 3 more. Customer service even called to confirm my address when the zip code looked funky above and beyond.

    Flawless with steel case
    Great customer service

    NONE

  4. Dwayne

    Verified Buyer

    Runs great!

    Value

    Overall Rating

    Price

    Quality

    Got these for my Universal M1 and was kinda nervous since people say those guns are picky with aftermarket mags. Loaded it up and ran two full mags at the range last weekend with zero hiccups. Locks in solid no wobble at all which surprised me for the price. Only thing is the spring is pretty stiff so getting that last round or two in takes some thumb work but thats normal. Would buy again.

    Locked in tight no wobble
    Fed every round no problem

    Stiff spring when loading full,
    Wish they sold a loader

  5. Eric J

    Verified Buyer

    Great capacity boost for my old carbine

    Value

    Overall Rating

    Price

    Quality

    Snagged this 30-rounder for my USGI M1 Carbine that Ive had since forever and it fits right in no problems with the mag catch though I had to make sure it was seated all the way or it wouldnt feed right at first. Compared to my beat up 15 rounders this ones a game changer for plinking honestly my buddy tried it in his full auto M2 and it held up fine too. For around 20 bucks its solid value even if the blued finish shows scratches quick.

    Holds 30 rounds no sweat
    Reliable after initial use

    Finish wears fast from handling

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