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Discussion Starter #1
I am a Class 3 SOT and my buddy gave me a Pre Sample MP5SD suppressor. He gave it to me because its blast chamber was all carbon caked up. The suppressor didn't cost me anything, so what the hell. I'm going to get this baby cleaned even if it takes me a year. I started off using a thin, curved blade tip, long shank wood chisel. Going through the breech end I kept tapping away at the carbon until I got tired. I then took an AR15/M15 chamber brush with stainless bristle bristles. I screwed it on to a five inch cleaning rod shaft and went to town with a power drill. Again more crap was removed, but I snapped off two cleaning brush shafts and quit. It looks like about 20% of the blast chamber is cleaned up. What a bitch.

I'm going to make a pint of Ed's Red, place a rubber stopper in the suppressor's breech hole, fill 'er up with Ed's Red and leave the suppressor soak for a week or so. I really want to unscrew the rear of the suppressor to get to the baffles and continue with the carbon caked blast chamber.
 

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One of the guys here (maybe HKCHUCK?) uses an ingenious method of affixing a fish tank bubbler through a cork and lets it bubble itself clean.


That's the best I've seen.
 

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Discussion Starter #4
Does anyone know if the blast chamber is screwed in via left hand threads or right hand threads? I may never get that far, but I have a potential need to know.


(Above jpg shamelessly stolen from a previous post)
 

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MG34

Not sure how well this setup would work on a suppressor so caked up as the one you have.
But for cleaning a lightly used one this way is pretty slick.




Fargo007 - You were right it was me.
 

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I am a Class 3 SOT and my buddy gave me a Pre Sample MP5SD suppressor. He gave it to me because its blast chamber was all carbon caked up. The suppressor didn't cost me anything, so what the hell. I'm going to get this baby cleaned even if it takes me a year. I started off using a thin, curved blade tip, long shank wood chisel. Going through the breech end I kept tapping away at the carbon until I got tired. I then took an AR15/M15 chamber brush with stainless bristle bristles. I screwed it on to a five inch cleaning rod shaft and went to town with a power drill. Again more crap was removed, but I snapped off two cleaning brush shafts and quit. It looks like about 20% of the blast chamber is cleaned up. What a bitch.

I'm going to make a pint of Ed's Red, place a rubber stopper in the suppressor's breech hole, fill 'er up with Ed's Red and leave the suppressor soak for a week or so. I really want to unscrew the rear of the suppressor to get to the baffles and continue with the carbon caked blast chamber.
Is there a particular builder you've used before? Perhaps they have taken one apart.
 

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What about "the dip"?
That's what I would do as long as the entire construction is at least stainless steel. If there are any aluminum parts then it's a no go. Hence why I never purchase aluminum suppressors. Which that's really only as issue with .22 but still. Must be stainless steel or better or I don't touch them. If we're talking rifle cans then I'm shooting for a stellite core. Good luck OP!
 

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Discussion Starter #10
Is there a particular builder you've used before? Perhaps they have taken one apart.
I spoke with Mike Woodward this morning and he has never disassembled one. These real HK suppressors are made of aluminum and harsh chemicals are a no-go. Prior to giving me this suppressor, my buddy tried to clean it with an ultrasonic cleaner. All that did was pit the aluminum exterior. The carbon crud was untouched. So, for all you guys out there considering using an ultrasonic cleaner, don't be dumbasses and place any aluminum in there. You are now officially warned.

Getting back to my challenge; Mike Woodward said a buddy of his cleaned a carboned up one on a lathe. It turned out perfectly. I don't have a lathe, but I'm going to keep going with a chamber brush and then try a small diameter cylinder hone. Mike did point out that cleaning out the blast chamber is all that needs to be done. The baffles never get too much carbon anyway and it's best to just leave them alone. He told me to just attack the blast chamber and all will be fine.

fargo007 said:
Won't the armorer's manual have this info? I'd check that if you haven't yet.
I couldn't find anything in Armorer's Manual pertaining to an SD's suppressor.
 

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CLR will soften up the carbon after soaking for a few weeks. I have used it on some SS cans. Not sure about safety on aluminum ?
 

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Doing it on a lathe (literally cutting away the carbon material) would definitely work.

But this would require a machinist with well developed manual skills. Every part of this would be a judgment call because you can't measure inside a part you can't get to.
 

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Discussion Starter #13
Doing it on a lathe (literally cutting away the carbon material) would definitely work.
But this would require a machinist with well developed manual skills. Every part of this would be a judgment call because you can't measure inside a part you can't get to.
I did a little more chipping away with my wood chisel and then more with the M16 chamber brush(s). I snapped two more chamber bushes and decided this was a good time for Ed's Red. I purloined one of my better half's Mason Jars, concocted 16 oz. of the red brew in said Mason Jar, placed a cork in the suppressor's bottom end, and poured away with the Ed's Red. I'll let everything sit for a week and see how it goes.
 

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3M makes a rotary brush that's made of scuff pad and sandpaper it's about 2" in diameter but will "squish" down some ...

 

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Discussion Starter #15
3M makes a rotary brush that's made of scuff pad and sandpaper it's about 2" in diameter but will "squish" down some ...
That's a great option! But, can I get it with six inch shaft?

I just checked my Mason Jar of Ed. I had 16 ounces to start with and now I have 12. So we can estimate that a gunked up HK MP5SD suppressor will hold about four ounces of fluid.
 

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I did a little more chipping away with my wood chisel and then more with the M16 chamber brush(s). I snapped two more chamber bushes and decided this was a good time for Ed's Red. I purloined one of my better half's Mason Jars, concocted 16 oz. of the red brew in said Mason Jar, placed a cork in the suppressor's bottom end, and poured away with the Ed's Red. I'll let everything sit for a week and see how it goes.
I wish gunsmithing had the same rule as doctors with the Hippocratic oath: "First, do no harm."

Your approach is refreshingly consistent with that.
 

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That's a great option! But, can I get it with six inch shaft?

I just checked my Mason Jar of Ed. I had 16 ounces to start with and now I have 12. So we can estimate that a gunked up HK MP5SD suppressor will hold about four ounces of fluid.
I don't know about getting one with a 6" shaft ... but I have a 6" drill bit extension that fits right on it ... ?

 

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What about blasting it clean with soda. These blasters are fairly cheap, you could try making up different nozzle extensions (photoshopped these) out of steel tubing. You'd have to adapt it to the existing nozzle that's on the gun.
Wash it out to dissolve the soda...just a thought?

Soda blaster.jpg
 

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Discussion Starter #19
What about blasting it clean with soda. These blasters are fairly cheap, you could try making up different nozzle extensions (photoshopped these) out of steel tubing. You'd have to adapt it to the existing nozzle that's on the gun.
Wash it out to dissolve the soda...just a thought?
View attachment 100970
That's a very interesting thought. I never considered it. I'm going to do some research on them. Thanks for the idea.
 

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That's what I would do as long as the entire construction is at least stainless steel. If there are any aluminum parts then it's a no go. Hence why I never purchase aluminum suppressors. Which that's really only as issue with .22 but still. Must be stainless steel or better or I don't touch them. If we're talking rifle cans then I'm shooting for a stellite core. Good luck OP!
My Coharie Arms SD can had all stainless internals and registered tube. It weighted over two pounds. It made the the gun so muzzle heavy. I had RCM "upgrade" the internals with anodized aluminum parts. It shaved over a pound and a half. Made the SDs much more balanced and easier to shoot.

BTW, Tactical Innovations made a TAC 67 .22 LR stainless steel suppressor. I'm fortunate enough to own one.

Scott
 
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