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Suppressors ECCO Machine and AAC 762SD

SPRword

Private
Minuteman
Sep 24, 2022
41
8
Minnesota
I’m hoping some of you with some ECCO machine experience can help me out here. I have an AAC 762-SD with the 51T mount. It was my first rifle can and for its day it was a fine suppressor, but ever since I got my SiCo Omega it’s basically just been sitting in the safe. I recently changed barrels on my AI AE and decided to put the 762-SD on and try it out again. My results were less than stellar. Even after fitting the mount to the suppressor, my groups are noticeably larger with the cannon than without. For example, today when I went to the range I was seeing 1.11 minute groups with the can vs .78 minute groups without. To confirm this wasn’t a one off or a barrel specific issue, I also tried it on my 6.5CM AI and my groups were similarly larger after putting the can on.

My theory is that the main issue is in the mount. I just don’t think there’s any way to make the 51T mount as precise and repeatable as newer mounting systems, even after fitting. To solve this and not have to buy a new suppressor, I am considering having Ecco machine swap the factory 51T interface for the universal 1.375-24 interface. I believe* that would allow me to use an ASR mount as well as the direct thread mount that came with my Omega, which is currently gathering dust in its box. Before I commit to this though, I’d like to get some information and advice from those of who’ve already walked this path. My main questions are thus -

1: Am I correct in assuming that the most likely issue with my accuracy is the mount and not the actual suppressor itself? Have those of you who’ve gone this route with a 762-SD or similar AAC can seen appreciable increases in accuracy and precision after going to an ASR (or similar, modern QD system) or direct thread mount, or is the actual suppressor and it’s design at issue here?

2: Am I correct in assuming that my SiCo Omega direct thread adapter will work with an AAC can that’s been converted to the 1.375-24 interface?

3: since I’d like to keep this suppressor QD compatible, is the ASR mount an acceptable way to go for a precision rifle can?

4: For those of you who have done this or something similar, what were your general thoughts on the experience and results? Anyone other than Ecco worth looking at?

I’d love to hear feedback on any part of my diagnosis or my plan. I’d aLao appreciate any info on other’s experiences who have tried this or something similar in the past. I should also add; I am aware that there is an upgrade program through AAC that would basically turn this thing into a Ranger 7, however it’s much more expensive and I really, really like the tone and look of the old school AAC cans, especially on an AI rifle. I’d like to keep that style and tone if possible. Thank you all in advance!
 
They re-cored a gemtec gm45 which was super loud back to traditional baffles for me. It sounds great now. Workmanship and communication were top notch. I wouldn't hesitate to do something with them again.
 
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ECCO converted my 762SD.

100% satisfied.

Which QD to convert to that’s very much subject to personal opinion.

Pick what you want and run with it.
 
ECCO converted my 762SD.

100% satisfied.

Which QD to convert to that’s very much subject to personal opinion.

Pick what you want and run with it.
Good to hear! Would you mind posting some pics of your 762-SD? I’m curious how well these look after they’re converted. Any improvement in accuracy after the conversion? Also, have you tried the direct thread rear caps to use it as a direct thread suppressor? How’s that look/work for you?
 
Had ECCO convert my AAC 762 SDN6 to SiCo Bravo mount. Before it seriously patterened like you would expect a shotgun to at 100 yards. POI would vary from POA wildly from shot to shot. Literally as much as a couple feet. No baffle or endcap strikes as verified by Nick at ECCO. After he modified it to SiCo Bravo that all went away with very little POI shift that was not caused by the knut behind the trigger. Made a paper weight that sat in my safe useable again. Money well spent imo.
 
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Call ECCO tomorrow or get on the list for the next batch, if that’s how they’re still doing it. Convert to HUB and never look back. Their work is outstanding and you’ll never regret it.

Here’s a picture of my 556-SD. I’d show you their thread work but honestly my 419 adapter is torqued in there really good and it’s late. You can see the weld where they cut off the back and welded on the new HUB threaded section. Cerakote is part of the job too so you’ll appreciate a fresh color on an old can. I know I sure did.

image.jpg
 
I’m hoping some of you with some ECCO machine experience can help me out here. I have an AAC 762-SD with the 51T mount. It was my first rifle can and for its day it was a fine suppressor, but ever since I got my SiCo Omega it’s basically just been sitting in the safe. I recently changed barrels on my AI AE and decided to put the 762-SD on and try it out again. My results were less than stellar. Even after fitting the mount to the suppressor, my groups are noticeably larger with the cannon than without. For example, today when I went to the range I was seeing 1.11 minute groups with the can vs .78 minute groups without. To confirm this wasn’t a one off or a barrel specific issue, I also tried it on my 6.5CM AI and my groups were similarly larger after putting the can on.

My theory is that the main issue is in the mount. I just don’t think there’s any way to make the 51T mount as precise and repeatable as newer mounting systems, even after fitting. To solve this and not have to buy a new suppressor, I am considering having Ecco machine swap the factory 51T interface for the universal 1.375-24 interface. I believe* that would allow me to use an ASR mount as well as the direct thread mount that came with my Omega, which is currently gathering dust in its box. Before I commit to this though, I’d like to get some information and advice from those of who’ve already walked this path. My main questions are thus -

1: Am I correct in assuming that the most likely issue with my accuracy is the mount and not the actual suppressor itself? Have those of you who’ve gone this route with a 762-SD or similar AAC can seen appreciable increases in accuracy and precision after going to an ASR (or similar, modern QD system) or direct thread mount, or is the actual suppressor and it’s design at issue here?

2: Am I correct in assuming that my SiCo Omega direct thread adapter will work with an AAC can that’s been converted to the 1.375-24 interface?

3: since I’d like to keep this suppressor QD compatible, is the ASR mount an acceptable way to go for a precision rifle can?

4: For those of you who have done this or something similar, what were your general thoughts on the experience and results? Anyone other than Ecco worth looking at?

I’d love to hear feedback on any part of my diagnosis or my plan. I’d aLao appreciate any info on other’s experiences who have tried this or something similar in the past. I should also add; I am aware that there is an upgrade program through AAC that would basically turn this thing into a Ranger 7, however it’s much more expensive and I really, really like the tone and look of the old school AAC cans, especially on an AI rifle. I’d like to keep that style and tone if possible. Thank you all in advance!
Send it to AAC for their "Restoration Program" which where where they cutup the entire can, save just the serialized portion (saving you from needing a new stamp), build a whole new suppressor out of it, give it a lifetime warranty, and it's lighter, quieter, and overall a significantly better suppressor. Plus, the new restored can is magnum rated.

 
I had them jailbreak my 762SD awhile back. They did a fantastic job with a quick turnaround time. Groups were significantly improved over the 51t mount. I went with a direct thread adapter, I'm pretty much finished with QD's.
 
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I had Nick chop the front of my Rex MG7K here and thread it for Dead Air end caps; I’m very pleased!
 
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Call ECCO tomorrow or get on the list for the next batch, if that’s how they’re still doing it. Convert to HUB and never look back. Their work is outstanding and you’ll never regret it.

Here’s a picture of my 556-SD. I’d show you their thread work but honestly my 419 adapter is torqued in there really good and it’s late. You can see the weld where they cut off the back and welded on the new HUB threaded section. Cerakote is part of the job too so you’ll appreciate a fresh color on an old can. I know I sure did.

View attachment 8396807
That looks fantastic, just what I’m looking for!
 
I had them jailbreak my 762SD awhile back. They did a fantastic job with a quick turnaround time. Groups were significantly improved over the 51t mount. I went with a direct thread adapter, I'm pretty much finished with QD's.
Good to hear the groups tightened up, that’s my main focus with this project. Did you go with the direct thread adapter that screws into a HUB setup or did you have him weld on a direct thread end cap? Curiously, why are you against QD? I ask because I like the idea of having a flash hider or brake covering the threads when I don’t have a can on it, and I like the ease of swapping between guns, but I’m still relatively new to the precision world so if there are benefits to direct thread that I don’t know about I’d love to hear them.
 
The more modern QD adapters are fine I'm sure. The 51t just soured me on them.
I just had them thread it to the standard ASR (if I remember correctly) and used a direct thread adapter. I can go to one of the QD mounted in the future if I want.
But since it now lives on my 300bo upper, it's fine for what I want.
 
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@smacha538 and I both had our SDN6s converted over to hub, couldn't be happier with the decision to have ECCO do it.

I love the shit out of my SDN6 cans, have beat on them for years and with what ECCO did I plan to continue to beat the shit out of them.
 
100% satisfied.
I had a POS from Witt Machine (useless piece of garbage) and had ECCO recore the can and replace the end cap with whatever the Q Cherry Bomb is.
Absolutely worth it for me.
image.jpg
 
100% satisfied.
I had a POS from Witt Machine (useless piece of garbage) and had ECCO recore the can and replace the end cap with whatever the Q Cherry Bomb is.
Absolutely worth it for me.View attachment 8397073
I laugh because you’re not the only person I’ve heard that from… All the hype when the Witt cans came out, I was extremely skeptical, and apparently was right to be so. Glad I never bought one, after hearing and reading many legit post-purchase opinions of them.
 
I had them do a 762 SDN6 to take ASR mounts. Very happy with the work.

Had ECCO convert my AAC 762 SDN6 to SiCo Bravo mount. Before it seriously patterened like you would expect a shotgun to at 100 yards. POI would vary from POA wildly from shot to shot. Literally as much as a couple feet. No baffle or endcap strikes as verified by Nick at ECCO. After he modified it to SiCo Bravo that all went away with very little POI shift that was not caused by the knut behind the trigger. Made a paper weight that sat in my safe useable again. Money well spent imo.
 
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Good to hear the groups tightened up, that’s my main focus with this project. Did you go with the direct thread adapter that screws into a HUB setup or did you have him weld on a direct thread end cap? Curiously, why are you against QD? I ask because I like the idea of having a flash hider or brake covering the threads when I don’t have a can on it, and I like the ease of swapping between guns, but I’m still relatively new to the precision world so if there are benefits to direct thread that I don’t know about I’d love to hear them.
I went to the cherry bomb break for this very reason of it being a sacrificial baffle essentially. The cherry bomb has been great, doesnt back off and accuracy is much better compared to the 51T. My homie @smacha538 uses his SDN6 with cherry bomb break on bolt guns and they shoot bugholes.
 
ECCO converted my AAC 762-SDN-6 and used the Area 419 Universal adapter. 100% satisfied and happy i went that route.

Which QD to convert to that’s very much subject to personal opinion.
 
I laugh because you’re not the only person I’ve heard that from… All the hype when the Witt cans came out, I was extremely skeptical, and apparently was right to be so. Glad I never bought one, after hearing and reading many legit post-purchase opinions of them.
They had a "promo" a few years back advertising "custom bore, custom SN" for like...199 I think.
Pretty sure it was like a 6" can.

Got it to use as something to just tame the noise at a match for 6mm match cartridges.
Tried it on 223, even tried it on a 16" 300 blk with subs...and it's not even CLOSE to hearing safe. Took it apart and it had 3 baffles.
Complete garbage.
 
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I can 100% vouch for ECCO machine and converting an sdn6 to run a cherrybomb. I got so fed up with that dog shit 51t mount. Sent it in. I can’t remember exactly what was done. All I know is they cut the ass end of it off and re-thread it for a q plan b. Now the can threads right onto a cherrybomb. I’ve shot many one hole groups on two different .308 rifles built by LRI. You won’t regret converting. Here some pics of my now Franken-can.
 

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I can 100% vouch for ECCO machine and converting an sdn6 to run a cherrybomb. I got so fed up with that dog shit 51t mount. Sent it in. I can’t remember exactly what was done. All I know is they cut the ass end of it off and re-thread it for a q plan b. Now the can threads right onto a cherrybomb. I’ve show many one hole groups on two different .308 rifles built by LRI. You won’t regret converting. Here some pics of my now Franken-can.
Looks awesome man, appreciate it. Im going for it! I’ll let you guys know how it looks/shoots when it’s back.