I know the suppressor threads to the brake and mates up to the collar. But how exactly does it mount to the barrel? Do you HAVE to have a MK12 barrel? How are people mounting these suppressor setups on barrels that are less than 16 inches?
- Thread starter KCode
- Start date
theres a step on the barrel that the rear coller seats against.
depending on the barrel you can get a custom one made or used to be able to if you emailed measurements to allen engineering.
it seems like hes maybe not doing a lot of that anymore? idk.
anyways i had one built to put my aem5 on a 14.5" socom barrel. those have a step in front of the gas block journal.
depending on the barrel you can get a custom one made or used to be able to if you emailed measurements to allen engineering.
it seems like hes maybe not doing a lot of that anymore? idk.
anyways i had one built to put my aem5 on a 14.5" socom barrel. those have a step in front of the gas block journal.
That's what I want! I want a OCM5 on a 14.5 barrel but I'm trying to figure out how. Can you pin and weld the MK12 brake? (I don't know how long the brake is though)
There’s an arfcom thread with all this info, though don’t they take kindly to Otter Creek.
Do you know the link to it? And what's wrong with Otter Creek?
Nothing wrong with Otter Creek, in fact their stuff is likely nicer than AE. Which is probably why AE isn’t a fan.
the brake is plenty long enough to pin and weld on a 14.5" barrel. you have to do it the treaded area though. i just ran a carbide end mill and cut it lower than the threads after welding.
So the collar and brake aren't gas block reliant at all other than the obvious the gas block cannot be between the collar and brake? How would handguard length be determined? Traditional flush thought is 1 inch less than the length of the barrel. So 14.5 = 13.5 rail or 16 = 15 rail.
How would you determine the handguard length with the MK12 setup? I'd like to run a Larue quad rail or maybe a DDM4
How would you determine the handguard length with the MK12 setup? I'd like to run a Larue quad rail or maybe a DDM4
I would contact ADCO and go over what barrel and rail you'd like to use with an AEM5 or OCM5. He's done a bunch of one-off projects to support reflex AE cans over the years.
ETA: Or Wilson, as noted below.
ETA: Or Wilson, as noted below.
Last edited:
I could be wrong but reading their description seems that it would have the end of the barrel at the collar. If that is the case you would lose a lot of velocity that way.
Pretty sure D Wilson will recontour barrels for this exact need to put a collar on to run the Ops Inc brake.
14.5" sounds fun. I love my 16" with an OCM5. It would be my go to gun for SHTF. Super versatile. Run it with a DBAL A2 and Surefire light.
77SMKs will fuck.
14.5" sounds fun. I love my 16" with an OCM5. It would be my go to gun for SHTF. Super versatile. Run it with a DBAL A2 and Surefire light.
77SMKs will fuck.
Attachments
Yep, this will be the ultimate SHTF setup. I never really even thought about it until I watched the video below. I'll be honest I did think about the 16 inch and not even worry about the pin and weld but I honestly would like to get it as 'short as possible' legally. 14.5 is such a perfect length for 5.56.
Oh and I found this in 14.5 so we are pretty much there other than the pin and weld, have to find someone to do that good.
centurionarms.com
Mk12 Barrel- Shiny, Machined Stainless
These barrels are the result of tens of thousands of dollars in development done to give our Special Operations the best weapon system they can have.
centurionarms.com Oh and I found this in 14.5 so we are pretty much there other than the pin and weld, have to find someone to do that good.
Mk12 Barrel- Shiny, Machined Stainless
These barrels are the result of tens of thousands of dollars in development done to give our Special Operations the best weapon system they can have.
Looks like they offer the collar and brake as an option. They may do the pin/weld. Probably worth a call.
They do not offer pin and weld
So I spoke with ADCO and they said they absolutely wouldn't touch it.
I also called D. Wilson and explained it to the girl that answered the phone. She said yea no problem. I expressed to her how different it would be vs a normal pin and weld and asked if she could double check with the gunsmith. She came back and said he said they could do it no problem. The same $60 as a normal pin and weld. I'm still a little skeptical it wasn't expressed the difficulty there could be. What do you guys think?
I also called D. Wilson and explained it to the girl that answered the phone. She said yea no problem. I expressed to her how different it would be vs a normal pin and weld and asked if she could double check with the gunsmith. She came back and said he said they could do it no problem. The same $60 as a normal pin and weld. I'm still a little skeptical it wasn't expressed the difficulty there could be. What do you guys think?
This doesn’t seem like it would be that hard, unless I’m missing something. Drill a hole in the brake half way up the threads , clean the shavings with a file, chase the threads with the appropriate threading die. Inspect. Test fit on barrel and screw on a can to ensure there’s no issue.
Maybe talk with https://www.thoroughbredarmco.com/ as well. They make the cans now, and versions of the Gordon Carbine which would also need a pin/weld to be legal if not SBR.
Maybe talk with https://www.thoroughbredarmco.com/ as well. They make the cans now, and versions of the Gordon Carbine which would also need a pin/weld to be legal if not SBR.
If you have a govt profile barrel, I think Otter Creek has a collar for that to work: https://ottercreeklabs.com/product/m4-collar/
Arfcom probably hates on OC because "he stole Ron's design" despite not even remotely using the same internal baffle design (Ops Inc's patent was largely for baffle design), OC owner seems a bit cocky at times maybe?, and his instagram is kind of cringe to me personally.
OC seems to make good suppressors, and while AE was transferring to Trajectory Arms or whoever is doing the AEM5 now, it was nice to see someone making moderately clone correct suppressors for all of us suckers who can't stop simping over the looks of a properly kitted MK12.
Arfcom probably hates on OC because "he stole Ron's design" despite not even remotely using the same internal baffle design (Ops Inc's patent was largely for baffle design), OC owner seems a bit cocky at times maybe?, and his instagram is kind of cringe to me personally.
OC seems to make good suppressors, and while AE was transferring to Trajectory Arms or whoever is doing the AEM5 now, it was nice to see someone making moderately clone correct suppressors for all of us suckers who can't stop simping over the looks of a properly kitted MK12.
Not related to that but guys correct me if I'm wrong here but does this OC OPS/AE Muzzle Brake not solve my problems above with pin and weld?
Attachments
Well you have to time it...?
Something to consider, most companies go off the original drawing for spacing from the threads to the collar step. On most of the cans I have seen this allows 2.5-3 full turns. Ron recommended I think 6 full turns . (My can shot fine with three turns and didn’t shoot loose)
If you pin and weld this before you know how many turns you’re going to get screwing the can on, if it’s short, you’re F’d as that collar won’t fit over the brake to set the shoulder back.
Might be best to have it all in one place to test for everything before you do any permanent work.
Could mean nothing to you. I have my barrels profiled for 6-10 turns on the can.
If you pin and weld this before you know how many turns you’re going to get screwing the can on, if it’s short, you’re F’d as that collar won’t fit over the brake to set the shoulder back.
Might be best to have it all in one place to test for everything before you do any permanent work.
Could mean nothing to you. I have my barrels profiled for 6-10 turns on the can.
That is actually solid advice. I didn't think of that but you are 100% right
Yeah my bad I was talking about their flash hider version.
Could you explain this more? Are you using the AEM5 and the SPR or M4 collar? I've ran into a few threads that say the brakes were originally shorter and are now longer, I'm wondering if this is the issue you are talking about. Do you mean the cans have changed or companies are changing the mounting pieces?
All of mine are mk12 collars. One has a Smith Enterprise flash hider which needed to have some taken off the back end to keep the front of the unit from bottoming out when installing with peal washers.
Here is how I understand it. Gene Barenett did the original five barrels and has the print still hanging in the Barrel Barn. The barrel these companies make are all basically based off that print. Not having actually been issued a mk12, my assumption is they used a small crush spacer or something along those lines to build the uppers in the issue rifles, but it’s an assumption.
When you cut the barrels to the original spec or the one from AEs website, it’s been my first hand experience across edit: FIVE barrels that you get less than or right at three turns. When I asked a couple end users they didn’t remember how many the turns the work guns had, so I called Ron and he advised 3 sounds right but he preferred 6 or so. (Going off memory, if Scout was still around I could look it up)
So, when we profile our barrels now we cut the “step” back a little.
I’ll have to check when I get home but I think the shoulder for the gas block was cut for a delta ring as well. It’s been about 5 years since I built a new one and probably 3 since I rebarrel so I’m a little fuzzy..
Here is how I understand it. Gene Barenett did the original five barrels and has the print still hanging in the Barrel Barn. The barrel these companies make are all basically based off that print. Not having actually been issued a mk12, my assumption is they used a small crush spacer or something along those lines to build the uppers in the issue rifles, but it’s an assumption.
When you cut the barrels to the original spec or the one from AEs website, it’s been my first hand experience across edit: FIVE barrels that you get less than or right at three turns. When I asked a couple end users they didn’t remember how many the turns the work guns had, so I called Ron and he advised 3 sounds right but he preferred 6 or so. (Going off memory, if Scout was still around I could look it up)
So, when we profile our barrels now we cut the “step” back a little.
I’ll have to check when I get home but I think the shoulder for the gas block was cut for a delta ring as well. It’s been about 5 years since I built a new one and probably 3 since I rebarrel so I’m a little fuzzy..
Last edited:
Can you guys see ANY way to make a CLE barrel work? https://compasslake.com/product/douglas-ss-1-7-spr-mk12-18-1/
Otherwise do you guys think it would be worth it to see if WOA could cut this down to 14.5 vs the Centurion MK12 barrel above in the thread? https://www.whiteoakarmament.com/16-spr-barrel-1.html
Otherwise do you guys think it would be worth it to see if WOA could cut this down to 14.5 vs the Centurion MK12 barrel above in the thread? https://www.whiteoakarmament.com/16-spr-barrel-1.html
More updates: WOA said they will not modify any finished barrels and they are not offering custom barrels currently. So that was bad news this morning.
However I had some better than good news this afternoon. On a whim I decided to call CLE and they apparently have exactly what I need! They do not have a 14.5 MK12 barrel however I was told their Recon 14.5 barrel would be exactly what I want and it has a cut for the collar. Even better news is they can, know how (explained it to me), and will pin and weld the MK12 muzzle device.
However I had some better than good news this afternoon. On a whim I decided to call CLE and they apparently have exactly what I need! They do not have a 14.5 MK12 barrel however I was told their Recon 14.5 barrel would be exactly what I want and it has a cut for the collar. Even better news is they can, know how (explained it to me), and will pin and weld the MK12 muzzle device.
That was not discussed and further CLE actually offers the 15.1 length barrel. I'm just getting into this so I'm sharing information with you guys as I learn it. But apparently the 15.1 barrel only exist because arfcom guys were begging for a barrel length that would leave the AEM5 flush with a KAC FF RAS. Now that the rail is no longer offered I don't see the point in going with the 15.1 barrel. However I also don't know what length rail would be used with a 14.5 setup, it could leave me at an odd length with a gap.
But to answer your question further, maybe an adjustable gas block would be beneficial. I don't really care for them but I've learned the AEM5 setup is gassy in general (even though I will be using a OCM5) so maybe a gas block like this https://suparms.com/750-adjustable-gas-block-stainless-steel-solid-set-screw-melonite-finish.html would be of use. Bleed off of gas will go out of the block and not the ejection port. However, again I do not know if that will make the setup louder or not.
There's still a lot of unknowns.
I found two more barrels that would work with the AEM5:
Green Mountain 18"
Bison Armory 16"
bisonarmory.com
Green Mountain 18"
Bison Armory 16"
16" SPR .223 Wylde Stainless
bisonarmory.com 
I know this post is a couple months old but did the OP check High Caliber Sales. Last time I emailed Kevin he said they could custom make a 14.5” Douglas barrel to work with the OPS INC style brake and OCM5. The only downside was the 4-6 month wait.
Little late to the party, but she was correct, it’s not difficult to do at all.
Literally one extra step to cut a flat on the threads, so we are pretty unphased by this.
I went this route because CLE had a 15.1” “recce” barrel on the clearance rack. I couldn’t find a KAC FF rail, so I bought a DD RISII and cut 1/2” off with a bandsaw. Touched it up with some of the dark brown krylon camo paint (matches perfect).
I wouldn’t do it again for the lack of rail selection that would work with this barrel length and can setup without being prohibitively expensive, requiring modification, or looking retarded. Next time will be a 16” from craddock and a 13” KAC URX4.
Attachments
Jesus that is sick...
