I only ordered them in March...of 2009! Now I can actually use the suppressor.
Here is a tip for you, if you are getting a Quick Detach suppressor, don't do it if they don't have your particular QD (OD/TPI) actually in stock. Save yourself the headache and buy a different brands suppressor who does have them in stock.
Yup, that little black piece is all I was missing.
sudo modprobe commonsense
FATAL: Module commonsense not found.
Shot it for the first time today. Awesome, but I already knew that having been around them before. Any decent suppressor will virtually eliminate all of the muzzle report. The primary source of noise is the sonic crack and the action. It is amazing how loud even a bolt action is when you aren't wearing hearing protection.
Generally, the sonic crack is dependant only on the bullets diameter and the fact it is super sonic. Research I found indicated that once the bullet is super sonic it doesn't matter how much faster it goes, the sound level in dB doesn't really climb. It does slightly, but it is trivial. Bigger diameter bullets are louder. A .308 caliber bullet is approx. 140 dB. Smaller is quieter, larger is louder. Don't have a good formula for estimating it though. However, it should be noted that that dB number is as the bullet flys right past the mic. When shooting, the shooter and spotter are already behind the bullet, so the dB at their position is much less. Usually in the high 120s or low 130s. A subsonic .308 is approx. 90 dB.
For impulse noise like this, 140-144 dB is claimed to be safe as long as your exposures are less than a couple hundred a day (can't find the source for that again). Thus, if you are taking a handful of shots it is ok to shoot without hearing protection, but if you are doing a lot of target practice/semi-autos/autos, it is advised to still wear ear plugs. If you haven't heard a suppressed super sonic rifle before it sounds like a loud kachoooo.
A badly designed suppressor, especially one made of Aluminium or Titanium, will have a ringing sound. Can't always hear it on the video recordings, but the shooter can hear it. This suppressor does not ring and is Ti. The tone of the suppressed fire matters a whole lot for military or hunting applications. Anyone (if you pay the ATF) can build something to eliminate the blast of a rifle with $50 of metal parts. Doing it so it doesn't ring, making it sound not like a gun shot, making it last under heavy use and making the POI shift consistant is harder
Was Kelly's first time shooting a suppressed rifle. She liked it. Literally is about as loud as a regular .22lr, but without the blast. The next one makes the .50bmg sound like a .22lr too.
POI shift was approx. 1 MOA right and 2 MOA down. Every rifle is different though. Given the Al receiver of that rifle, it appears to change the harmonics a lot. What matters is that it is consistent as far I can tell. More testing for sure, but I need to go much further.
sudo modprobe commonsense
FATAL: Module commonsense not found.
I want to start saving for a LRB M25 forged M1A and suppress that too. Something like this one:
Shorten the barrel to 18-20" so that when suppressed it isn't much longer or heavier than a regular M1A. Put this suppressor on it: http://www.advanced-armament.com/product.aspx?pid=195
That one is a reflex mount (slides over the barrel) which provides for better semiauto fire (less gas blow back). The JBE stock is the bomb too. Only way to make the M1A consistently a 1MOA or better gun without going to a full bedding setup, which M1As eat alive. A lot of competitors have two guns because of that. One is being bedded, one is shooting. Big reason for the AR15 takeover in high power comp. Would want to put a S&B PMII scope on it, but I need to start saving because that is a big money gun.
That would make it a MBR/DMR crossover, with suppressor and able to fire 147-175gr bullets at 1MOA to about 800-1000 yards, but still clear rooms. Zombies are no match!
sudo modprobe commonsense
FATAL: Module commonsense not found.
Hearing protection! What an interesting concept. Has that been around very long? Do they use it in the Army? Do you think if I go to a VA Hospital I can get my hearing back?
Since 1948 when I was sent out to Camp Drake (1st Ca.) outside Tokyo to hone my "skill" preparatory to being sent to Camp Perry (I wanted one of those Marine DI/Smokey Bear hats), I've been able to listen to crickets, peeper frogs, and similar 24/7. There's nuthin' like spending all day shooting beaucoup bandoleers out of an M1 in a concrete-lined underground tunnel without that hearing protection stuff you all are making up.
When that day was over I handed back their stinking replica of the finest war-fighting implement ever devised and told the shavetail he could cash in my ticket to Ohio and keep the damn bear hat.
I've been listening to those little green frogs for 62 years now and have memorized the tunes.
You might be interested in the ongoing testing at NFATalk.org. Testing various silencers on various platforms and publishing the results for free.
Personally I think metering silencers is a waste of time, but people seem to like it.
gunderwood wrote:For impulse noise like this, 140-144 dB is claimed to be safe as long as your exposures are less than a couple hundred a day (can't find the source for that again).
"Claimed" is the operative term here. Any shooting, with any silencer and any ammo combo, is damaging to hearing. The 140dB number is an arbitrary one picked by OSHA - hearing is still being damaged at that level, and at 130, and at 120. And the damage is cumulative and never heals.
If you're serious about protecting your hearing, you should wear earpro even when using a can. The silencer just means the muffs and/or plugs are more effective, and persons/animals in the area are less affected.
Metering only tells you what the peak pressure was. Tone quality and duration are ignored. You can have a suppressor meter lower, but subjectively sound much louder than another that metered higher. IMHO, construction, attachment, weight and size all matter more than a metered dB level. They all reduce the blast significantly.
Agree on the hearing protection. It is fun to occasionally shoot without it though. Using the milspec standard, this can metered at 127dB for .338LM in the tests I've seen. Although, that number can swing +-5dB based on a lot of things.
sudo modprobe commonsense
FATAL: Module commonsense not found.
gunderwood wrote:Metering only tells you what the peak pressure was. Tone quality and duration are ignored. You can have a suppressor meter lower, but subjectively sound much louder than another that metered higher.
Yes! Metering is extremely limited and provides what amounts to a keyhole view of the silencer's performance. It's academically interesting but I sigh when people base purchases off meter numbers alone.
Using the milspec standard, this can metered at 127dB for .338LM in the tests I've seen. Although, that number can swing +-5dB based on a lot of things.
The milspec standard is kinda crap. I suppose it's better than none at all, but there are still too many potential variables to make one set of tests comparable to another set of tests.
I'm not really a silencer geek like some guys I know. I use them as accessories, not as ends in themselves. Of course, that viewpoint leads one to accumulate them, like holsters or scopes or something...
Finally, My QD Muzzle Brakes!
