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So I haven't seen anything about mating an ultimak with the strikeforce, so I thought I'd try to lend a hand if anyone else is interested in doing so. (I have a 183 series mini-14)
The Strikeforce stock comes with a (removeable) polymer rail section on top of the supplied handguard, however: 1) id like to be able to go back to my wood stock whenever I want without losing zero on my scout mounted reflex sight. Easy to do with the Ultimak since it secures directly to the barrel and gas block. The Strikeforce handguard only secures to the stock, meaning when changing stocks, optic mounts must be changed. and 2) I don't have much faith in my mini's accuracy yet, definately not enough to allow another variable like a polymer rail on a composite handguard only held down with three screws through plastic make it worse. So I decided to keep my old ultimak I was using with the wood stock and make it work with the Strikeforce.
upon doing some research, the folks at ATI told me it should work fine, Well needless to say it didn't. Theres a lip on the stock that helps to retain the handguard. This lip interferes with the bottom of the Ultimak. After a few minutes with a sanding drum on the dremmel, it looked like this:
I'm not sure what the stock is made of exactly, but it melts fairly quickly during grinding, so it's best not to stay in one spot too long or you will end up with bumps like mine. Luckily I took off just a little, so it cleaned up well with a wide file.
All said and done, it's a tight fit. The more lip you leave, the more plastic must be deformed by force to seat the upper barrell and reciever assembly. I think this may have some good effects on accuracy, like bedding the reciever, the rifle is forced into the stock, thereby forcing the stock to conform around the parts in contact before being seated all the way, eliminating more empty space. time will tell if this is true.
Hope this helps if you are considering this option. Personally, I love it! If you like scout monted optics, or they're your only option (like me) then the Ultimak is definately the way to go. This weapons platform is only made better by the ATI stock. hell of a weapon if you ask me.
By the way, this also frees up the polymer rail for the hanguard to be used as a 7" bottom rail on the stock. be sure to check out my other post for details on that process.
The Strikeforce stock comes with a (removeable) polymer rail section on top of the supplied handguard, however: 1) id like to be able to go back to my wood stock whenever I want without losing zero on my scout mounted reflex sight. Easy to do with the Ultimak since it secures directly to the barrel and gas block. The Strikeforce handguard only secures to the stock, meaning when changing stocks, optic mounts must be changed. and 2) I don't have much faith in my mini's accuracy yet, definately not enough to allow another variable like a polymer rail on a composite handguard only held down with three screws through plastic make it worse. So I decided to keep my old ultimak I was using with the wood stock and make it work with the Strikeforce.
upon doing some research, the folks at ATI told me it should work fine, Well needless to say it didn't. Theres a lip on the stock that helps to retain the handguard. This lip interferes with the bottom of the Ultimak. After a few minutes with a sanding drum on the dremmel, it looked like this:

I'm not sure what the stock is made of exactly, but it melts fairly quickly during grinding, so it's best not to stay in one spot too long or you will end up with bumps like mine. Luckily I took off just a little, so it cleaned up well with a wide file.
All said and done, it's a tight fit. The more lip you leave, the more plastic must be deformed by force to seat the upper barrell and reciever assembly. I think this may have some good effects on accuracy, like bedding the reciever, the rifle is forced into the stock, thereby forcing the stock to conform around the parts in contact before being seated all the way, eliminating more empty space. time will tell if this is true.


Hope this helps if you are considering this option. Personally, I love it! If you like scout monted optics, or they're your only option (like me) then the Ultimak is definately the way to go. This weapons platform is only made better by the ATI stock. hell of a weapon if you ask me.
By the way, this also frees up the polymer rail for the hanguard to be used as a 7" bottom rail on the stock. be sure to check out my other post for details on that process.