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loaded mag

Discussion in 'General Gun Discussions' started by gilbolter@live.com, Mar 11, 2012.

  1. gilbolter@live.com

    gilbolter@live.com New Member

    is it harmfull to keep a mag loaded full time?
  2. chevyforlife21

    chevyforlife21 Well-Known Member

    A good practice is to keep it 10 percent less then full so 9 rounds in a 10 rounder or 27 in a 30
  3. Iramo94

    Iramo94 Well-Known Member

    If a spring is compressed to less than a certain critical point, it can stay there for a long time without deforming. I would imagine that mag springs are designed so stay within thT range under any load. So I'd say no. The bad thing is loading and unloading them a lot. That causes internal friction in the spring, which causes wear. That's why I use different mags for fun and business.
  4. Redlg155

    Redlg155 Well-Known Member

    I have never had a problem keeping mine loaded to full capacity. At one time it was conventional wisdom in the military to underload a 30rd mag by 1 round, but I look it at this way. Most designers intentionally leave some room to avoid full compression of the spring. Just check a loaded mag and I would bet that you can push the top round down a bit.
  5. chevyforlife21

    chevyforlife21 Well-Known Member

    I have a few ar 10 rounders that don't even like to accept 10 completely no spring travel left
  6. The Lone Haranguer

    The Lone Haranguer Well-Known Member

    The magazine spring fatigues through use, i.e., firing the gun, not from simply being compressed, even over a long period of time. If you put your car in storage for several years, you don't come back to find it "pancaked" on the ground. ;)
  7. brboyer

    brboyer Well-Known Member

    Perfectly fine with a normal quality mag.
  8. M2 Carbine

    M2 Carbine Well-Known Member

    A good magazine, NO.
    A poor quality magazine, YES.

    The most extreme example I know of is a fully loaded military 1911 magazine that was given to me in 1961. The owner's Grandfather brought it home from WWI. The magazine had remained loaded all those years (don't know what became of the Grandfather's WWI 1911).

    I just had to see if the old ammo would shoot, and it did but it was too weak to begin to work my 1911 slide.

    The magazine spring seemed as strong as my other 1911 magazines. I lost track of which mag was the old one and now it is mixed up with my other 1911 magazines and still works fine.

    I leave many different magazines loaded for years, even in my cars 24/7 in the Texas heat. Never had the first bit of trouble.

    I did have a SKS rifle magazine spring go bad (weak) after several years being loaded.
  9. Driftertank

    Driftertank Well-Known Member

    Springs in general will experience "sag" as they age and go through range of movement and heat cycles. In the "old days" it was common knowledge that loaded mags would "take a set" and springs would weaken over time. I never experienced this myself, and i'm pretty sure that modern, decent quality mags don't care one way or the other. Out of learned habit, however, I keep most of my mags unloaded, and rotate, on occasion, which ones ARE loaded...usually after shooting empty the ones that WERE loaded. I figure even if they do take a set, it will happen so slowly and consistently through my whole collection of mags that i won't see failures in my lifetime.

    My experience has been, however, that bad mags start out bad.
  10. Creature

    Creature Well-Known Member

    I consider this an uninformed and bad practice.
  11. Robert

    Robert Moderator

    Um ok. Care to explain why you feel that way?
  12. holdencm9

    holdencm9 Well-Known Member

    It is bad advice because the benefit of maybe getting longer life out of a magazine is far outweighed by having 10% fewer rounds.

    My materials science class I learned that the number of load cycles is what fatigues metal, and the number of allowable cycles increases as the compression decreases. If the mag & spring are designed properly it should be able to take a full load and be just fine.
  13. btg3

    btg3 Well-Known Member

    ^^^^ +1 Yup!
  14. Creature

    Creature Well-Known Member

    Bad practice because the potential cost tactically of one less cartridge does not outweigh the benefit of possibly extending the life of the magazine spring.

    Uninformed because modern spring steel, which has been explained ad nauseam for many years by fairly qualified experts here on this and other forums, is less susceptible to "spring set" or weakening.
  15. BIGGBAY90

    BIGGBAY90 Well-Known Member

    no, i've shot a mag. Thats been loaded for over 8 years and no problem. Thats my experience but others may have a different story
  16. xfyrfiter

    xfyrfiter Well-Known Member

    Some of the cheaper mags will not insert on a closed bolt and some will have feed lips spread. I have neve had a failure due to compression.
  17. wally

    wally Well-Known Member

    I had an old Jennings .380 that sat forgotten about in a tool box in the garage for 8+ years. It was loaded full mag + 1 in the chamber. Just for grins I took it out and all 7 rounds fired fine (two or three mags without a failure is about the best it could ever do) so if a Jennings mag has no problem sitting unloaded, I just wouldn't worry about it!
  18. tryshoot

    tryshoot Well-Known Member

    I agree in reducing rounds, esp. in hi cap.Newer springs do better than older ones. 30 yr. and older have more chance of losing tension. Do not leave 1906 colt orig mag loaded full.
  19. lono

    lono Well-Known Member

    I keep all mags loaded. I have for years. I have not noticed any ill effects.
  20. 303tom

    303tom member

    I keep some in just about every magazine I have..............

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