Modern Sporter - Build Discussions

Hi, yeah it is the same guy. (Me haha) and I really appreciate all the help and feedback in regards to my modern sporter issue from the CGN community. ATRS (Shaun is who I spoke too) was super helpful. I will take it apart again and look again at the barrel indexing. (It was a Maple Ridge Armory barrel). Hopefully I didn’t over torque it. I did use a torque wrench and used the recommended specs. However it is my first major build so I am not one to assume I did it correctly the first time haha.
 
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Hey guys. I've read all the pages in this thread and remember reading about someone having issues fitting a Magpul UBR stock. My brain is saturated and I can't recall where in this thread I read about it. Can anyone offer their experience fitting that stock to the MS? Thanks.
 
hend238 said:
Hey guys. I've read all the pages in this thread and remember reading about someone having issues fitting a Magpul UBR stock. My brain is saturated and I can't recall where in this thread I read about it. Can anyone offer their experience fitting that stock to the MS? Thanks.
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Zero issues on mine
 
The details were along the lines of having to modify the receiver end plate or something like that to make the UBR fit. I don't know. I'm going back over the thread to see if I can find the post.
 
hend238 said:
Hey guys. I've read all the pages in this thread and remember reading about someone having issues fitting a Magpul UBR stock. My brain is saturated and I can't recall where in this thread I read about it. Can anyone offer their experience fitting that stock to the MS? Thanks.
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hend238 said:
The details were along the lines of having to modify the receiver end plate or something like that to make the UBR fit. I don't know. I'm going back over the thread to see if I can find the post.
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That was on early models. The Modern Sporter came directly from the Modern Varmint, and the Modern Varmint never used a buffer retaining pin, they came with JP silent capture springs. A side effect of this was that we had a thicker tail end on the receiver. I can't recall exactly, but I think that was remedied around serial number 100 or so, Maybe it was #200.
 
I may have had at one point #149 and couldnt use the retaining pin with the ubr stock. Which is a moot point as I used the scs and would never go back to a standard spring and buffer. That twang is unbearable after using the scs.
 
can anyone give me a quick rundown on the CMMG .22 conversion (or if there is a better version I'm all ears)? I have a spare upper laying around and I'm leaning towards a .22 but I don't know what's all needed for that. If you can provide a full parts list and what needs to be done modification wise that'd be sweet! I assume its something I'll have to get ATRS to do.

Thanks!
 
Ryang5177 said:
can anyone give me a quick rundown on the CMMG .22 conversion (or if there is a better version I'm all ears)? I have a spare upper laying around and I'm leaning towards a .22 but I don't know what's all needed for that. If you can provide a full parts list and what needs to be done modification wise that'd be sweet! I assume its something I'll have to get ATRS to do.

Thanks!
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Atrs can do the mod on your Cmmg bolt. Then just put it in your rifle and shoot away. They need to shorten the cmmg bolt about 3/16 of an inch to work in a .223 Sporter. Beyond the cmmg kit and mags there are no other parts required.
 
robab said:
Atrs can do the mod on your Cmmg bolt. Then just put it in your rifle and shoot away. They need to shorten the cmmg bolt about 3/16 of an inch to work in a .223 Sporter. Beyond the cmmg kit and mags there are no other parts required.
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Awesome thanks! Standard buffer system I assume? I’ve been loving my silent capture springs from armaspec and JP.
 
ATRS Shaun said:
That was on early models. The Modern Sporter came directly from the Modern Varmint, and the Modern Varmint never used a buffer retaining pin, they came with JP silent capture springs. A side effect of this was that we had a thicker tail end on the receiver. I can't recall exactly, but I think that was remedied around serial number 100 or so, Maybe it was #200.
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Thank you sir.
 
How is the accuracy of 22lr that typically uses 16 inch twist when using 5.56 nato barrels with typical twist rates of around 1:8" twist? would cci minimags ammo work well with cmmg conversion kits?
 
Ryang5177 said:
can anyone give me a quick rundown on the CMMG .22 conversion (or if there is a better version I'm all ears)? I have a spare upper laying around and I'm leaning towards a .22 but I don't know what's all needed for that. If you can provide a full parts list and what needs to be done modification wise that'd be sweet! I assume its something I'll have to get ATRS to do.

Thanks!
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If you have a spare upper, I’d highly recommend making a dedicated.22lr
Check out the 22lr modern sporter thread on the ATRS page of CGN.

I made one and it is the funnest and most reliable 22 I have.
 
Question on buffer tube length.

Putting a 18.6'' barrel on my MS build, trying to keep it NR. It will have a rifle length gas system.

My intention was to strip the buffer tube & stock from one of my carbines (a Diemaco SA-15.7 or a Core15, both with carbine gas system) and to fit it to this build.

Other than stripping an original Diemaco (I know...), is it a mistake to fit a carbine buffer tube? Should it be a rifle length?

Not sure how one affect the other so thank you in advance for schooling me on this
 
UR2X3M4ME said:
Question on buffer tube length.

Putting a 18.6'' barrel on my MS build, trying to keep it NR. It will have a rifle length gas system.

My intention was to strip the buffer tube & stock from one of my carbines (a Diemaco SA-15.7 or a Core15, both with carbine gas system) and to fit it to this build.

Other than stripping an original Diemaco (I know...), is it a mistake to fit a carbine buffer tube? Should it be a rifle length?

Not sure how one affect the other so thank you in advance for schooling me on this
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I was just looking into this same thing (I'm a newbie to the platform). From what I've read, it shouldn't be an issue. Might have to play with buffer weight to find a balance your rifle likes.

FWIW, this was info I got from some discussion on ar15.com. They mentioned the CF rifles with adjustable stocks.

Disclaimer: I don't pretend to know anything about the rifles our military is issued. Just what I read, any member here can correct me please.

Edit: I'm planning on trying this with mine, the consensus seems to be that using a regular carbine buffer with the rifle length gas system is good to go, some say play with buffer weight. Just wanted to clarify, but I haven't tried it myself yet.
 
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