My first airgun silencer

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otonel
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My first airgun silencer

Post by otonel »

Hy all because this is my first post!
I make for my airgun Hatsan 85 5,5mm a silencer inspired from an 22 pistol silencer design but I was disappointing because the decreasing sound noise was around to 10 db .
Silencer is made from aluminium cast and I made also a barrel fitting for attach silencer
I would certainly welcome any or suggestions which could improve the silencer design and excuse my bad english
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gunningbadger
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Re: My first airgun silencer

Post by gunningbadger »

Are you in the US? If so you just admitted to a felony. Sorry to everyone else. Beat you to it.
otonel
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Re: My first airgun silencer

Post by otonel »

I`m from Romania, where to make a airgun silencer is not a felony or something illegal.
Just silencer for fireguns are prohibited by law
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MV10
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Re: My first airgun silencer

Post by MV10 »

gunningbadger wrote:Are you in the US? If so you just admitted to a felony. Sorry to everyone else. Beat you to it.
I assumed from "5,5 mm" instead of "5.5 mm" that he was non-USian.

How much noise does an airgun really make? I have a pair of pretty powerful break-barrel pellet guns but I think all their noise is mechanical. I have read that internal pressure can spike at as much as 3000 PSI, but that is only about an eighth of a light .22LR load, and of course there is no powder going "bang"...

10db is half as loud (perceptually), that's not so bad from a "clamp on"...
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Re: My first airgun silencer

Post by Fallschirmjäger »

gunningbadger wrote:Are you in the US? If so you just admitted to a felony. Sorry to everyone else. Beat you to it.
Wrong, and before you poop yourself trying to respond how the ATF will break down your door, if you manufacture a moderator for an airgun, you did not commit a felony. Check it out, court rulings, etc... There's an entire cottage industry out there for LDC's/moderators here in the US...
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doubloon
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Re: My first airgun silencer

Post by doubloon »

You're dealing with a roughly constant flow of gas once it leaves the muzzle. It's not still expanding from unburnt fuel.

A simple freeze plug design is very effective on air guns.
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Re: My first airgun silencer

Post by DoctorSolo »

gunningbadger wrote:Are you in the US? If so you just admitted to a felony. Sorry to everyone else. Beat you to it.
I just love it when whistleblowers run into a conversation, don't you? Especially uninformed ones.
Are you a nanny? I bet you are really close to getting that junior ATF agent merit badge :roll:
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Jt.kline19
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Re: My first airgun silencer

Post by Jt.kline19 »

gunningbadger wrote:Are you in the US? If so you just admitted to a felony. Sorry to everyone else. Beat you to it.
You sound like an idiot.
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a_canadian
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Re: My first airgun silencer

Post by a_canadian »

doubloon wrote:A simple freeze plug design is very effective on air guns.
While acknowledging that this somewhat ancient thread has been dredged up for no particularly good reason (why? to insult people?) I'll go ahead and respond to this comment based on experience of having built a couple of dozen airgun cans. Perhaps this is semantic quibbling, but in my experience simple washer/freeze plug designs are not 'very' effective on air guns. I'd describe them as 'somewhat' effective, as in better than nothing certainly but nowhere nearly as effective as plastic or aluminum K baffles with reasonably tight bore tolerances and good cross-bore venting.

Adding dry or oiled steel wool between washer/freeze plug baffles aids considerably in suppression, but isn't as effective as a good stack of lightweight delrin or other plastic K baffles.

After having built a handful of washer types (over a dozen for three different pistols) and another handful of monocores (8 I think) in various configurations (1" to 1.5" tubes, 6" to 9" long, various patterns of milled baffling from complex to fairly open big hole types like the one shown by forum member nutshot in these pages), I'd rank a good monocore as being closer to K baffle performance than to washers. Pretty darn good, but not excellent.

My current squirrel rig is a very loud PCP pistol (Brocock Atomic modified to put a 15.8gr pellet out at 600fps) used as a carbine with a 1" x 8" 0.050" aluminum tube, delrin front and rear plugs and a mix of delrin and ertalyte K baffles carved in a somewhat chubby profile compared to a typical firearm K. Not huge volumes outside the rounded cones but still enough to lose some pressure into. Stepped surfaces throughout to interrupt flow. It's downright quiet. Take the can off and I need hearing protection or firing the thing hurts.

Still, washers or freeze plugs with some sort of sound absorbing material around the perimeter can be quite effective if you don't have a means of making the more sophisticated baffles. Just be sure to have some sort of mesh in place to prevent that absorptive material from working its way into the bore. Steel wool has a tendency to follow the air, making the bore look quite fuzzy after a little while and interfering with accuracy.

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(edited: made more paragraphs to please a certain forum member)
Last edited by a_canadian on Thu Feb 27, 2014 8:05 pm, edited 1 time in total.
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doubloon
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Re: My first airgun silencer

Post by doubloon »

a_canadian wrote:.. I'll go ahead and respond to this comment ...
Comprehensive, I would have found it easier to read broken up into smaller paragraphs.

Admittedly my comment was very general and based on limited to experience with a .177 commercial design rifle. I fully acknowledge my comment falls apart for larger calibers and pistols but I'm still ignorantly biased for 5,5mm and smaller caliber rifles. :D
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Re: My first airgun silencer

Post by a_canadian »

There, I broke it up for you dubloon.

As to the larger calibres... um, this is a .22" pellet I'm talking about, along with two .177" pistols I've experimented with. 5.5mm and 4.5mm respectively. Not exactly big bore.
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doubloon
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Re: My first airgun silencer

Post by doubloon »

Yep 5,5 == .22. Like I said, I'm ignorantly biased. :D
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