Search found 632 matches

by ECCO Machine
Thu Jan 14, 2021 1:38 am
Forum: Silencersmithing Forum
Topic: Just a little something for fun
Replies: 7
Views: 228

Re: Just a little something for fun

Best description for that would be muzzle weight.

Nice design work, but unfortunately, reflex designs are inefficient at best. Put features in the reflex portion that inhibit flow, efficiency is worse still. You'd get more suppression out of a 5" K can.
by ECCO Machine
Sat Jan 02, 2021 11:47 am
Forum: Silencersmithing Forum
Topic: Baffle Clip Advice requested
Replies: 9
Views: 677

Re: Baffle Clip Advice requested

For subsonic/low pressure stuff, double radiused clips ~40% of aperture diameter with depth slightly less than or equal to clip width. For high velocity applications, single radiused clip ~ 50% of aperture diameter and depth 100-120% of width. Always aligned, whether single or double. I wouldn't was...
by ECCO Machine
Thu Dec 31, 2020 4:12 pm
Forum: Silencer Talk
Topic: Can this be repaired?
Replies: 5
Views: 482

Re: Can this be repaired?

Thanks for the clarification. That should save some time by having it done locally. :) Just remember that if they're not an FFL/SOT, you can't drop it off with them, as it would be illegal for a non-SOT who isn't a registered owner to possess the can in your absence. You will need to be present the...
by ECCO Machine
Thu Dec 31, 2020 1:55 pm
Forum: Silencer Talk
Topic: Non threaded Springfield
Replies: 2
Views: 441

Re: Non threaded Springfield

If a threaded barrel is available, that's usually the best choice.

But yes, most any pistol barrel can be threaded and have an extension made for it, do them all the time.

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by ECCO Machine
Thu Dec 31, 2020 1:49 pm
Forum: Silencer Talk
Topic: Can this be repaired?
Replies: 5
Views: 482

Re: Can this be repaired?

Only a SOT 7/02 can legally repair a finished can. Contact one and learn if they can replace the near endcap with something that works. If it threads on, should be easy to replace. Otherwise, they will weld it. Don't have to be an SOT to make repairs, only required to manufacture new parts. A non-S...
by ECCO Machine
Tue Dec 29, 2020 9:31 pm
Forum: Silencersmithing Forum
Topic: Centerfire bolt action, Integrally suppressed?
Replies: 13
Views: 960

Re: Centerfire bolt action, Integrally suppressed?

Finally got around to chronographing with the 18" ported barrel (30 ports from the 14.5" to 17" mark) on this integral. 7mm-08 proved to be a good choice. With a 46.0 gr. charge of H414 (not a max load), 150 gr. bullets averaged 2,641 FPS. These loads would probably clock around 2750-2800 from a 20"...
by ECCO Machine
Fri Dec 18, 2020 1:34 pm
Forum: Silencersmithing Forum
Topic: Centerfire bolt action, Integrally suppressed?
Replies: 13
Views: 960

Re: Centerfire bolt action, Integrally suppressed?

Mind if I ask how you mounted that, I like the looks. I'm assuming some type of 2 point mount, a taper on the breech end? It's essentially a 10.5" tubeless muzzle mounted suppressor with a big tube over it that extends back to the receiver. The barrel is ported, and there is a collar with O rings i...
by ECCO Machine
Sat Dec 12, 2020 4:55 pm
Forum: Silencersmithing Forum
Topic: Stainless steel alloy choices for silencer construction.
Replies: 20
Views: 16657

Re: Stainless steel alloy choices for silencer construction.

It has been a while. Ecco. If I’m not wrong you where machining these, than heart treat them to 900. Assemble and weld, machine the outside after fusioneelding than heat again to 900 right? I used to heat treat then weld. This was due to my constraints with heat treating larger parts and assemblies...
by ECCO Machine
Sat Dec 12, 2020 2:01 pm
Forum: Silencer Talk
Topic: Now Talk About A 9mm Suppressor!
Replies: 4
Views: 1065

Re: Now Talk About A 9mm Suppressor!

Aah, a couple images down: "This is not a Class III weapon and will not require a Form 4 for transfer. The enclosed 'can' is furnished as a "prop" to illustrate an NFA identified silencer. This ersatz silencer has a .22 Cal discharge hole and is unsafe to fire a 7.65mm bullet the gun is designed fo...
by ECCO Machine
Sat Dec 12, 2020 1:49 pm
Forum: Silencersmithing Forum
Topic: Centerfire bolt action, Integrally suppressed?
Replies: 13
Views: 960

Re: Centerfire bolt action, Integrally suppressed?

.308 class cartridges are about perfect for an integrally suppressed rifle that still has enough oopmh to do things like hunt big game or print small groups at several hundred yards. You're still going to give up some velocity if you want something that's not a truly long stick, but the short action...
by ECCO Machine
Mon Nov 30, 2020 11:08 pm
Forum: Silencersmithing Forum
Topic: Re-smithing commercial can ?'s and input
Replies: 3
Views: 494

Re: Re-smithing commercial can ?'s and input

As an SOT, it's not like you're invested with the stamp and wait you'd want to preserve as a F4 transferee. Sell them dirt cheap with fill disclosure and build from scratch instead of trying to work within the limitations of a junk tube that's set at length of F2. And yes, I know what those are. 416...
by ECCO Machine
Wed Oct 07, 2020 10:35 am
Forum: Silencer Talk
Topic: Bilock mount question
Replies: 2
Views: 794

Re: Bilock mount question

There's nothing you can do to shorten the mount or muzzle device that won't negatively affect function.
by ECCO Machine
Wed Oct 07, 2020 10:32 am
Forum: Silencersmithing Forum
Topic: combo machines 3 in 1 lathes and mills
Replies: 22
Views: 8562

Re: combo machines 3 in 1 lathes and mills

You won't see manual combination machines in professional shops. There's a reason.

IMO, they should be avoided entirely. The only things they excel at are wasting time and causing frustration.

Some folks liken them to CNC millturns. They aren't remotely close.
by ECCO Machine
Tue Jul 21, 2020 8:22 pm
Forum: Silencersmithing Forum
Topic: .22 rimfire, integral vs add-a-can
Replies: 14
Views: 1693

Re: .22 rimfire, integral vs add-a-can

T-Rex wrote:
Tue Jul 21, 2020 7:26 am
If you're going to do a 10/22, just do a really good muzzle can, that you could swap between hosts. The action of the 10/22 doesn't let you get to hollywood quiet. If you wanted to do a bolt gun, go integral, all day long.
This. Integrals are pretty much a waste on semi auto .22 rifles.
by ECCO Machine
Fri Jul 17, 2020 11:30 am
Forum: Silencersmithing Forum
Topic: What would cause inaccuracy when hot?
Replies: 13
Views: 1147

Re: What would cause inaccuracy when hot?

I didn't chose that bore arbitrarily, it was a decision based on previous results. If dealing w/ cones, I'd agree about tightness. However, K's rely on trapping gas and the more you trap the greater the design's efficiency. I've found that they (K's) can benefit greatly from a tighter bore. Depends...
by ECCO Machine
Thu Jul 16, 2020 3:44 pm
Forum: Silencersmithing Forum
Topic: What would cause inaccuracy when hot?
Replies: 13
Views: 1147

Re: What would cause inaccuracy when hot?

Not sure of OP's design, but I've done 9mm K's (what the OP is using) w/ a bore of ~.386. That's only 16thou clearance, per side. No issues w/ accuracy and marginal POI shift. I'd say that was more luck than anything. I would never go less than .040" diametral clearance, usually run .050"-.060". No...
by ECCO Machine
Thu Jul 16, 2020 10:23 am
Forum: Silencersmithing Forum
Topic: What would cause inaccuracy when hot?
Replies: 13
Views: 1147

Re: What would cause inaccuracy when hot?

A 6-inch offset at 50 yards sounds to me like a Bernoulli effect. The bullet isn't rubbing baffles, it's just getting so close that the pressure on the edge is pushing against the bullet and changing its course slightly the air is acting like a bearing. I agree. .400" is pretty tight for 9mm. Doubl...
by ECCO Machine
Wed Jun 24, 2020 10:53 am
Forum: Silencersmithing Forum
Topic: Welding endcaps
Replies: 9
Views: 1021

Re: Welding endcaps

Have access to a smallish stick welder - a 120amp that runs off 110V plug. Have a can I'd like to weld with it. Since I know about nothing, have 2 big questions for now. Just don't. Even back in the day when I was regularly using stick and well practiced, I wouldn't have used it for this purpose. Y...
by ECCO Machine
Mon Jun 22, 2020 11:06 am
Forum: Silencersmithing Forum
Topic: What Is Maximum PSI In .22 Rimfire Can?
Replies: 5
Views: 563

Re: What Is Maximum PSI In .22 Rimfire Can?

Oh, oh, ECCO, your saying " .. You're forgetting Boyle's Law ," hurt me to the quick. RAYLEIGH* ly now. Guess at upcoming 60th class reunion Math/Physics degrees get recalled :) :) But you are forgiven, my friend. Thank you for chuckle. No need to be snarky. I don't know your background, your educa...
by ECCO Machine
Sun Jun 21, 2020 8:45 pm
Forum: Silencersmithing Forum
Topic: What Is Maximum PSI In .22 Rimfire Can?
Replies: 5
Views: 563

Re: What Is Maximum PSI In .22 Rimfire Can?

Reading "US ARMY FRANKFORD ARSENAL SILENCERS PRINCIPLES AND EVALUATIONS" where they evaluated .22. Figure of 24,000 PSI chamber but 1,000 PSI estimated at muzzle. It puts the lie to Hollywood's cartoonish use of 'soda bottle plastic suppressors' by secret agents on the run. You're forgetting Boyle'...
by ECCO Machine
Fri Jun 19, 2020 9:32 pm
Forum: Silencersmithing Forum
Topic: Form 1 Maker when is it officially made?
Replies: 10
Views: 922

Re: Form 1 Maker when is it officially made?

What you're asking/thinking about would be illegal. It's a silencer when it meets the definition, not when you say so. Well, sort of. Technically, it's a silencer as soon as you bore the end cap and assemble that onto the tube. But that doesn't mean it's illegal for the F1 maker to manufacture the ...
by ECCO Machine
Tue Jun 16, 2020 6:15 pm
Forum: Silencersmithing Forum
Topic: Form 1 design for an FN1900 in .32 ACP
Replies: 10
Views: 712

Re: Form 1 design for an FN1900 in .32 ACP

ECCO Machine, in your pistol can the baffles seem to snap together to keep them aligned, but in the pic you posted of the rifle suppressor internals, they do not. Is there a specific reason for that? The rifle can pictured is pre-assembly; it is a fully welded tubeless suppressor. The clips are ali...
by ECCO Machine
Mon Jun 15, 2020 1:04 pm
Forum: Silencersmithing Forum
Topic: Form 1 design for an FN1900 in .32 ACP
Replies: 10
Views: 712

Re: Form 1 design for an FN1900 in .32 ACP

By the sounds of it, my baffle design specifically need some work. But generally speaking, what plays into the desicion to go with Ks, cones, or slant washers? I'm trying to learn here, but the impression I had going into this was that Ks (obviously better designed ones than mine) were superior in ...
by ECCO Machine
Mon Jun 15, 2020 12:17 am
Forum: Silencersmithing Forum
Topic: Form 1 design for an FN1900 in .32 ACP
Replies: 10
Views: 712

Re: Form 1 design for an FN1900 in .32 ACP

Personally, 'd just fill the volume with cones, but K's can work, too. I just don't think 4 K's will do as good as however many cones you could stuff in there (probably ~8). This. My .32 ACP pattern is a 1.125 x 6.5 .035 wall Ti tube with one 17-4 conical baffle and ten anodized 7075-T651 conical b...
by ECCO Machine
Thu May 28, 2020 11:12 am
Forum: Silencersmithing Forum
Topic: Clipping a 5.56 Suppressor worth the accuracy and POI issues?
Replies: 20
Views: 6516

Re: Clipping a 5.56 Suppressor worth the accuracy and POI issues?

Kailkey charging handle will turn semi auto into a single shot. I have a massive reflex suppressor back to the gas block 1.75” od 10 baffles , total length past muzzle brake about 4.5 “. It’s a very heavy beast but very quiet and never been bothered by gas from ejection port. It’s about 34oz. So it...