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M3 Grease Gun Magazine

The M3 Grease Gun Magazine is a 30-round, .45 ACP stick magazine built to original USGI specification by United Defense LLC. It features stamped steel construction, a parkerized finish, and the classic double-column, single-feed Sten-pattern design that the M3 and M3A1 submachine guns were built around. The body is uncut and full-length, dropping straight into any host chambered for unmodified USGI Grease Gun mags, and it can be cut down to run in MAC-10/45 platforms with a paddle release. A solid choice for owners of registered M3 / M3A1 submachine guns, MAC-10/45 shooters, and collectors who want a dependable spare on hand.

In stock

SKU
TI-0003
  $39.95
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  • Buy 5 for $34.95 each and save 13%

Description

Features

  1. .45 ACP Chambering — Built to feed standard 230-grain .45 ACP ball ammunition through any unmodified M3 or M3A1 host.
  2. 30-Round Capacity — Full-size USGI-pattern stick magazine holds a complete 30-round load for sustained range sessions.
  3. Double-Column, Single-Feed Design — Faithful to the original wartime spec, patterned after the British Sten magazine for reliable cycling in the M3 platform.
  4. Stamped Steel Body — All-steel construction with clean stampings and solid spot welds for long service life.
  5. Parkerized Finish — Even phosphate coating resists corrosion and matches the look of original GI-issue mags.
  6. Made by United Defense LLC — Modern production to original USGI dimensions, an uncut full-length body with no factory modifications.
  7. M3 and M3A1 Compatible — Drops into any firearm built for unmodified USGI M3 / M3A1 Grease Gun magazines.
  8. MAC-10/45 Capable — Works in M10/45 and MAC-10/45 hosts already set up for uncut mags, or can be cut for a paddle-style release.
  9. Heavy-Duty Internal Spring — Strong follower spring keeps tension consistent from the first round to the last.
  10. Collector and Shooter Grade — A practical feeding device for live-fire use and a fitting spare for any Grease Gun collection.

More Information

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United Defense Products
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Customer Reviews

4.9

85 reviews

100% of customers recommend this product

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Top customer reviews

  1. GreaseGun

    Verified Buyer

    Buying spares while I still can

    Value

    Overall Rating

    Price

    Quality

    Picked up four of these for my build and they all lock up tight with no rattle. Ran about 200 rounds through em on saturday with mixed brands of ball ammo and not a single failure to feed. The heavy steel construction is exactly what you want in a sub gun mag feels just like the originals my grandpa talked about from his service days. The springs feel really stiff at first but thats good, means theyll have full tension after thousands of rounds. Real happy with the buy

    Heavy duty steel construction feels just like original WWII issue mags
    Locks up tight in the mag well with zero rattle or wobble

    Springs are really stiff at first, takes some thumb strength to top off

  2. Marty

    Verified Buyer

    Bought four no regrets

    Value

    Overall Rating

    Price

    Quality

    Picked up four of these for my build and they all lock up tight with no rattle. Ran about 200 rounds through em on saturday with mixed brands of ball ammo and not a single failure to feed. Heavy steel build, feels just like the originals my grandpa talked about. Real happy with the buy.

    Heavy duty steel construction

    Springs feel really stiff at first

  3. Old Hound Dog

    Verified Buyer

    Solid mag for the price point

    Value

    Overall Rating

    Price

    Quality

    Not much to say really, it works. Ordered two of em and they both functioned fine out of the box. Customer service was real helpful when I had a question about compatability before ordering, got a response same day which was nice.

    Good customer service experience

  4. biker69

    Verified Buyer

    It's the best on the market

    Value

    Overall Rating

    Price

    Quality

    Took this out to the range today and worked great. I ran and filled it 100 bullets and ran well. Might have to get a few more for the the fun. Thanks for a great transaction.

    Exactly what I wanted and fast shipping.

  5. GunNerd9999

    Verified Buyer

    Made very well with very strong materials

    Value

    Overall Rating

    Price

    Quality

    Picked these up last month and they've performed flawlessly. Fits perfectly, no wobble, feeds smooth every time. Customer service was super helpful when I had questions if this would work with my Vector 45. Which they did!

    Got what I wanted in a timely manner. Good to go.

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