Thank you Form I’m now a mk12 believer

[Fever Buck]

Douglas barrel contoured for the over the barrel suppressor, and a good rigid forearm arrangement. In my opinion it’s kinda heavy for general carry. VG accuracy. I’d sell my PRI even though it’s cool to carry around in the truck. I think it’s more of a nostalgic piece, back to the “Lone Survivor” movie for those of us that did not serve/global war on terror timeframe and its use thereof.

Thanks. That’s good info.

 

[Formidilosus]

Y’all drop some knowledge on me. What makes the Mk12 so special compared to any other 18” SPR?

See below.

Douglas barrel contoured for the over the barrel suppressor, and a good rigid forearm arrangement. In my opinion it’s kinda heavy for general carry. VG accuracy. I’d sell my PRI even though it’s cool to carry around in the truck. I think it’s more of a nostalgic piece, back to the “Lone Survivor” movie for those of us that did not serve/global war on terror timeframe and its use thereof.

It’s more than that.

The MK12 Mod 0 is one of the few items that is more than the sum of its parts- it is not just an 18” rifle length gas barrel AR.
When you put the OTB Ops Inc/AEM5/OCM5 can on it- the balance, recoil impulse, reticle movement, and sound all work together well. The forend is stiff already, but with the top rail locking the receiver and the handguard together- it’s extremely stiff, functionally creating a monolithic upper. The diameter of the handguard also helps- it’s wider than normal which makes it sit on bags or rests well, yet is rounded and narrow enough to carry comfortably.

The MK12’s are unique- especially the Mod 0 and H’s. They bring together a bunch of parts into a system that to this day isn’t matched in feel or performance while shooting to any others- which they should makes sense- as that’s how they were conceived and designed. It’s one of the few (very few) systems that started from actual skilled shooters and morphed into a rifle.
The MK12 Mod 0 and H’s are probably the only US mil AR style rifles worth cloning.

 

[nm.otter]

Not being an AR guy, I had to do a bit of reading. Quite a story https://sadefensejournal.com/the-mk12-spr-special-purpose-rifle/

 

[NSI]

Didn’t want to start a new thread for this, but thought the group would appreciate this creator’s large data set approach.

-J

 

[nm.otter]

Interesting. I like his A-ZED metric.

 

[SC_Scout]

Have any of you tried the PSA version of the MK12? They have a standard Mod O clone that uses some PRI components, and a Mod S that is a 14.5” barrel and collapsible stock with PSI fore end. The price is pretty good, and living near a couple PSA stores would be convenient if there were any problems down the road.

 

[SC_Scout]

See below.





It’s more than that.

The MK12 Mod 0 is one of the few items that is more than the sum of its parts- it is not just an 18” rifle length gas barrel AR.
When you put the OTB Ops Inc/AEM5/OCM5 can on it- the balance, recoil impulse, reticle movement, and sound all work together well. The forend is stiff already, but with the top rail locking the receiver and the handguard together- it’s extremely stiff, functionally creating a monolithic upper. The diameter of the handguard also helps- it’s wider than normal which makes it sit on bags or rests well, yet is rounded and narrow enough to carry comfortably.

The MK12’s are unique- especially the Mod 0 and H’s. They bring together a bunch of parts into a system that to this day isn’t matched in feel or performance while shooting to any others- which they should makes sense- as that’s how they were conceived and designed. It’s one of the few (very few) systems that started from actual skilled shooters and morphed into a rifle.
The MK12 Mod 0 and H’s are probably the only US mil AR style rifles worth cloning.

I pulled the trigger on a MK12 mod O upper from Brownells today. They are offering the 15% off, that also stacks on top of military/law enforcement pricing. Thanks for your reviews and insight on the system.

 

[Choupique]

Bump

I have a white oak 16" SPR upper that I am getting ready to order a can for. The barrel is basically a mod H profile. I'm hung up on what to get - AEM5 or OCM5 or something else like an AB A10. It's strictly a hunting rifle, mostly a box stand rifle for my wife and kids. Shoots great already, just need to get the noise down.

Is there any functional advantage to either the AEM5 or OCM5? Research indicates they both sound really good, OCM5 is lighter, AEM5 is the OG. Old design, something better out there these days? From an engineering perspective I really like how the AE design centers on a taper aft of the muzzle, it seems like that would have a real advantage in stiffening up the whole system.

 

[rbutcher1234]

Bump

I have a white oak 16" SPR upper that I am getting ready to order a can for. The barrel is basically a mod H profile. I'm hung up on what to get - AEM5 or OCM5 or something else like an AB A10. It's strictly a hunting rifle, mostly a box stand rifle for my wife and kids. Shoots great already, just need to get the noise down.

Is there any functional advantage to either the AEM5 or OCM5? Research indicates they both sound really good, OCM5 is lighter, AEM5 is the OG. Old design, something better out there these days? From an engineering perspective I really like how the AE design centers on a taper aft of the muzzle, it seems like that would have a real advantage in stiffening up the whole system.

Purists hate the OCM5 because of how the owner acted to Ron Allen.

Functionally, no real difference between them for what you’re doing. While lighter, the ocm5 is still heavy. Basically, just buy whichever one you find in stock cheaper. They both are great on mk12s.

 

[Choupique]

Purists hate the OCM5 because of how the owner acted to Ron Allen

I noticed there was some serious animosity towards otter creek in some of the online forums.

Problem is nobody in my circle of buddies owns either one, or anything close to a mk 12 build, so I'm pioneering.

Functionally, no real difference between them for what you’re doing.

Sweet.

Now, is it worth buying either one just because I have a barrel profiled for it? Or is something like an AB A10 going to give me just as good results for nearly $650 less? I don't have the brake or collar yet, so that's an extra ~ $150 on top of the much more expensive suppressor.

 

[rbutcher1234]

The AEM5/OCM5 are amazing on the mk12, all versions. They’re durable, very quiet, do not have absurd backpressure, and very rigid with the two piece collar. Every single person who has shot my mk12 has gone and purchased their own.

I can’t make the money decision for you. I can only offer two pieces of advice:
1. Triple confirm the profile of your barrel is actually ops profile. There are lots of barrels that get called “spr” profile that are not dimensionally correct for the collar and brake

2. The entire mk12 system is the precision AR15 in symbiosis. The can is a big part of that.

 

[Choupique]

Triple confirm the profile of your barrel is actually ops profile. There are lots of barrels that get called “spr” profile that are not dimensionally correct for the collar and brake

I did that. I have (limited) access to a full blown machine shop and a background building pumps and engines. Mine is definitely correct for the AE stuff. I kinda took a chance on the white oak complete upper, it was ~ $600 complete when I bought it, the idea being to try to save the budget for the suppressor part of it as well.

The entire mk12 system is the precision AR15 in symbiosis. The can is a big part of that.

Yea and it looks like the majority of people get better groups with the AEM5/OCM5 vs bare muzzle brake with the MK12s. That leads me to believe that the way the can mounts and the interaction with the gas system is what is causing that. Mine being a 16" with a carbine gas system, I don't have my hopes so high as 1 MOA but so far, it's pretty close to that already with a regular A2 flash hider and a frakenbuild lower with carbine parts.

I think yall satisfied my search for confirmation bias, I know I want an AEM5 but alas, I am a cheap bastard and everything I buy has to be "worth it." I'll see which one my silencer dude can actually get for me and order the brake/collar today, that way I don't have a choice.

 

[MagnumHntr]

Bump

I have a white oak 16" SPR upper that I am getting ready to order a can for. The barrel is basically a mod H profile. I'm hung up on what to get - AEM5 or OCM5 or something else like an AB A10. It's strictly a hunting rifle, mostly a box stand rifle for my wife and kids. Shoots great already, just need to get the noise down.

Is there any functional advantage to either the AEM5 or OCM5? Research indicates they both sound really good, OCM5 is lighter, AEM5 is the OG. Old design, something better out there these days? From an engineering perspective I really like how the AE design centers on a taper aft of the muzzle, it seems like that would have a real advantage in stiffening up the whole system.

Ill be getting a US triple 6 for my mk12. I think it will be perfect for hunting applications.

 

[Remington92]

Bump

I have a white oak 16" SPR upper that I am getting ready to order a can for. The barrel is basically a mod H profile. I'm hung up on what to get - AEM5 or OCM5 or something else like an AB A10. It's strictly a hunting rifle, mostly a box stand rifle for my wife and kids. Shoots great already, just need to get the noise down.

Is there any functional advantage to either the AEM5 or OCM5? Research indicates they both sound really good, OCM5 is lighter, AEM5 is the OG. Old design, something better out there these days? From an engineering perspective I really like how the AE design centers on a taper aft of the muzzle, it seems like that would have a real advantage in stiffening up the whole system.

My PRI Mk12 Mod 0 has an OCM5 on it and for a stand rifle that I wasn't hoofing for miles I see no reason to try anything else (asides from an AEM5) unless its your only can you're planning to move around. In my mind the can could be welded on the barrel since I will never shoot it without it. The rifle definitely is at its peak as a total system. Noise wise its the quietest centerfire I own.

Cant help you on the AEM5 vs OCM5 functionally. I have a Sparks, Nevada made Aem5 but its NIB on a shelf hoping one day it will be more desirable as a collector piece. I will say the OCM5 is a fair bit lighter and supposedly quieter.