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[NFA] Suppressing an M1 Garand?

Discussion in 'Rifle Country' started by heypete, Jun 14, 2007.

  1. heypete

    heypete Well-Known Member

    Something odd occurred to me while I was cleaning my M1 Garand this evening: the threads on the barrel that are used, in combination with a little screw-on bit and the gas plug, to hold the front sight assembly on the rifle would be ideal for mounting a suppressor.

    Obviously, it'd need to be fit properly and with enough room for the gas plug to screw in, but I figure it'd be possible.

    Now, a suppressor would probably muck with the pressure curve and might stress the op-rod, but I wonder if that could somehow be compensated for?

    Anyone know if such a suppressor exists? I know there are many .30 caliber suppressors on the market, but most of them are for bolt-action guns, not semi-autos, and I've certainly not seen any for the M1.
  2. PercyShelley

    PercyShelley Well-Known Member

  3. Ian

    Ian Well-Known Member

    I talked to and emailed a couple suppressor companies about this very question not too long ago, and they basically all said it would have to be a one-off custom deal (not enough market). You'd have to first get a custom-made barrel extension of some kind; the threading for the gas plug isn't long enough or of the right size for a standard suppressor.
  4. mpmarty

    mpmarty Well-Known Member

    Then you have to figure out how to get an ancient battle rifle to operate at all with a sub sonic cartridge. Ya see ya can't suppress a cartridge with over a thousand feet per second velocity the "crack" a rifle makes is the bullet breaking the sound barrier as it exits the muzzle.
  5. Zak Smith

    Zak Smith Moderator Staff Member

    However, the "crack" is not the loudest part of the report. There is a dramatic difference in shooting a suppressed vs. unsuppressed centerfire rifle with full-power ammunition.
  6. heypete

    heypete Well-Known Member

    Ian: I figured there'd be some custom work involved, and I know a few local manufacturers that can build such silencers, but I just wonder about the gas pressure involved -- the M1 is particularly sensitive to the pressure curve (needing to be very close to M2 Ball spec, else it bends the op rod) and I know that silencers would change that pressure curve a bit.

    mpmarty: Not entirely true. I've fired suppressed M16s (yes, full-auto ones) and while the crack from the supersonic shots is still present, the muzzle blast (usually quite a bit louder) was greatly reduced.

    This is evident when shooting .22LR ammo suppressed, and you can see the difference between super- and subsonic ammo both suppressed and unsuppressed here.

    As Zak points out, there's a significant difference in the noise generated between suppressed and unsuppressed rifles shooting supersonic ammunition. Obviously, the shot is far quieter with subsonic ammunition, but it's still reduced quite a bit even with supersonic stuff.
  7. Correia

    Correia Moderator Emeritus

    I fired over 1,000 rounds of suppressed 5.56 last weekend. The supersonic "crack" is really more of a mild chuff, and even on my 10.5" gun it sounds like an unsuppressed .22LR.
  8. Ian

    Ian Well-Known Member

    Hmm...I have no idea how much impact a suppressor would have on the pressure curve. However, I'm not sure the Garand is quite so fragile as you make it sound. A slightly lower pressure/velocity loading would solve any potential problem, I would guess.

    If you find out any more info on how to do this, please post it - I'd be really tempted to get a suppressor for my M1 if I could. :)
  9. Bartholomew Roberts

    Bartholomew Roberts Moderator Emeritus

    The other nice thing about a suppressed full-power rifle cartridge is the "crack" of the bullet travels with the bullet, unlike the initial muzzle blast. I love shooting my suppressor on bays where you can here the crack reflect back off all sides of the berm as it travels downrange.
  10. loadedround

    loadedround Well-Known Member

    FYI, Brownells sells a muzzle brake/suppressor for the M1 Garand that is a no 'smith drop in.
  11. Ian

    Ian Well-Known Member

    That brake is made by Smith Enterprises, who specifically states that's it's not for use with their .30-cal suppressors. I don't know why, though - could be that it doesn't have a tight enough straightness spec (something that would be necessary for a long suppressor but not for a simple muzzle brake), or just because the QD system isn't compatible with it.

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