That is left over from the firearms act of 1934.
The same law that regulates sawed off shotguns, short barrelled rifles
and machine guns. You need to fill out a BATF form 4, passport
pictures, fingerprints etc, let the FBI and BATF look you over for
about 14 weeks, pay the $200 (a princely sum in 1934) and if
everything comes out OK your local chief LEO has to sign the
application and you get the tax stamp. Then you can pick up your
suppressor, machine gun or whatever. If not you are still out the
I don't understand this. In a sonic boom, all the sound arrives at
the same time, because the airplane, or the bullet makes some of its
sound later than other sound, but the plane or bullet is so much
closer to the listener that sound still arrives at the same time.
And that's what makes the boom.
In a subsonic plane, the sound is made all the time, and it arrives at
the listener over almost that same period of time. So you hear the
plane coming for 30 seconds or more
With a bullet, the shooter is behind the bullet. The longer the time
since the bullet was fired, the farther away from him the bullet is,
so any sound made by the bullet itself would be made later and have to
travel farther to reach the shooter.
But no one ever said that the bullet was making the sound. It 's
the exploding gas that makes the sound. For the same weight of
bullet, it must take more powder and a bigger explosion to get the
bullet to travel faster, so the noise would be louder, but only in
proportion to the speed the bullet is meant to travel. If the bullet
travels 600mph (below the speed of sound) instead of 800mph (above it)
the sound for the slower bullet should be about 6/8ths the sound for
the faster bullet. (Or maybe the square of that 36/64ths, a little
more than half) . But the speed of sound would not be a special
delimiter. Any decrease in speed would accompany a decrease in sound.
And assuming the length of the bullet is the same, a supersonic .22
caliber bullet would make less sound than a subsonic .45.
I'm not really sure what they were trying to accomplish with these
tests. As someone else noted, you need sub-sonic ammo to get
reasonable suppression and they used supersonic ammo in all these
tests (most of the noise is from the bow wave of the bullet).
Sounds bogus, to me. I had an early superblackhawk 44 mag. The
cyl-to-barrel gap was a tight 0.003". I can't see any production
process permiting a tighter tolerance. Anyway, that 3 mils didn't
prevent a wall of flame and a deafening boom from escaping the gap.
The BEST you can do is use a revolver, fold a pillow over the gun, and
fire at close range. Sound will be heard but not very far, plus NO
flash..I know I tried EVERYTHING. - before internet avaiable research.
The best small one I ever made was an empty paper towel roll cut to
still longer than a toilet paper roll. Fill the tube with fluffly wads
of facial tissue, overlap the barrel about 1 1/2 to 2 inches and use
I understand there is an 'Israeli' type you can make in the field for
multiple use - Uses a series of washers in a tube to provide the
baffling, built on the principle ofthe auto muffler
On Sun, 20 May 2012 07:52:33 -0700 (PDT), Robert Macy
Milk bottle caps in a 1.5" PVC pipe with a coil of window screen in
the first 4" is supposed to work but trying it is illegal so I don't
know, That is my story and I am sticking to it.
The rumor is a .22 sounds like a BB gun. That is th rumor anyway.
The rumor is also that a BX connector will jam down on a .22 barrel
fairly well and give you some 1/2" NPT threads that the PVC screws on.
I have no idea if any of this is true.
OTOH this is pretty quiet, even in a stock rifle.
I watched a guy shooting sub-somic ammo at our range through a hvy brl
target rifle. It was literally as quiet as those Hollywood suppressed
movie pistols. It was hilarious to watch, cuz the guy walked up to
his bench dressed like an active military shooting team member, OD
fatigues, jarhead hat, heavy leather GI shooting jacket with slings
and straps and all that Camp Perry crap, scopes, blackout glasses,
honkin big prone position layout pad, etc. We all put down our rifles
and watched this guy meticulously lay out his setup and don his gear
getting prepared to shoot, thinking he was gonna whip out some big
bore long arm and start banging away at 200 yrd targets. Nope! The
rifle was impressive, prolly a Rem 40X, with iron target sights, etc,
but only .22 rimfire. It merely went "poof", "poof". Cracked me up,
but I'll never forget it. Compared to everyone else on the firing
line, we could barely hear his gun's report. Would be perfect for
hunting squurrels or rabbits under 50 yds. Be aware, I've heard some
sub-sonic ammo will not cycle a semi-auto.
Shorts won't cycle most semis, so
subsonic even more so.
Christopher A. Young
Learn more about Jesus
wrote in message
Be aware, I've heard some
sub-sonic ammo will not cycle a semi-auto.
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