Yes, it can be legal to make a silencer. For everything Form-1, from silencer designs that are easily made, to filing forms with the BATF, to 3D modeling. Remember, you must have an approved BATF Form-1 to make a silencer. All NFA laws apply.
Sergeant wrote:How'd you get that to stop? Or did it just go away?
Shoot 500 rounds unsuppressed. An 18" barrel with hunting loads still rings my ears and is disorienting. A 28" barrel is like nothing to me anymore.
Theres a reason I have a salvo12 in NFA jail
You know that you can't "condition" your ears, right?
They stopped being rung because your hearing is damaged. Anything over 140 dB can cause instant, permanent damage. Those high intensity noises literally snap off the stereocilia.
Most NIHL is caused by the damage and eventual death of these hair cells. Unlike bird and amphibian hair cells, human hair cells don’t grow back. They are gone for good.......................
NIHL can also be caused by extremely loud bursts of sound, such as gunshots or explosions, which can rupture the eardrum or damage the bones in the middle ear. This kind of NIHL can be immediate and permanent.
Yes I'm aware that my ears are damaged, hence the reference to my salvo12 purchase. Yes, I was joking about my injury being a built up resistance to tinnitus. I do actually seem to have a resistance to ears ringing from shotgun shooting, but it comes at a cost of a very very faint constant ringing. So faint that I don't actually hear it unless it's very quiet and I consciously listen for it. My brother's ears are far worse. I attribute it to him hunting with a semi auto (and a ported choke) for the past 5 years while I used a pump.
300 blackout form 1: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=137293
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
Well to be fair .17HMR is doing double the speed limit at least, so lots of ultrasonic crack. There seemed to be substantial muzzle blast reduction, if not massive reduction, but it's hard to tell on camera. Might show off the muzzle blast reduction better, or more accurately anyway, if you fired a yard or two in front of the camera, shooting away.
a_canadian wrote:Well to be fair .17HMR is doing double the speed limit at least, so lots of ultrasonic crack. There seemed to be substantial muzzle blast reduction, if not massive reduction, but it's hard to tell on camera. Might show off the muzzle blast reduction better, or more accurately anyway, if you fired a yard or two in front of the camera, shooting away.
When he gets done with lunch, I'll see if we can do that.
I'd have to hear it in person to pass judgement, or better yet, meter it. Noise leveling mics and the limits of the software don't give a good representation of actual SPL reduction
Actual shooter's ear noise levels? 136 dBA with subs, 141 with supers. Muzzle was much lower, but there's significant port noise even with the heavy >2 lb bolt.
Excellent work. I'm glad that you and your friend tried something different and succeeded. When you have machine tools that create nearly anything that you imagine why make an exact replica of someone else's suppressor?
Ecco Machine, the sound difference is obvious. Remember that this is dedicated to .17HMR bolt action rifles. Even if the noise reduction wasn't impressive, which it is, there is little to gain from lowering the noise of the muzzle blast to a level below the supersonic crack.
0101silent wrote:
Ecco Machine, the sound difference is obvious. Remember that this is dedicated to .17HMR bolt action rifles. Even if the noise reduction wasn't impressive, which it is, there is little to gain from lowering the noise of the muzzle blast to a level below the supersonic crack.
Except sonic crack doesn't occur right out of the gate, and tiny bullets like .17 don't have much of one.
Shooting starting at :36, pay attention to the difference that even the mic pics up clearly when the rounds are going down range to the berm @ 120 yards vs. impacting the dirt 10 feet away
The sonic crack of the .17 HMR may be in the 130s, but it won't happen until the bullet is >10 feet from shooter's ear. Reflection & refraction notwithstanding, the attenuation of SPL is about -6 dB for every doubling of distance, so a 132 dB sonic crack occurring 10-12 feet from the shooter's ear will be roughly equal to a 123 dB muzzle report at 3.5'.
ECCO Machine wrote:I'd have to hear it in person to pass judgement, or better yet, meter it. Noise leveling mics and the limits of the software don't give a good representation of actual SPL reduction
Give me a date and a place and I bet I can make it happen. We're located an hour south of Limon.
