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Posted: 6/12/2009 4:36:59 PM EST
Gonna buy a Magpul stock. I'm thinking the Ruger has a Commercial tube. Anbody know for sure?
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Posted: 6/13/2009 1:41:17 AM EST
...
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Posted: 6/13/2009 1:54:46 AM EST
http://img.photobucket.com/albums/v75/spankthemonk/intake/milspecsr556.jpg
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Posted: 6/13/2009 2:03:50 AM EST
[Last Edit: 6/13/2009 2:06:25 AM EST by CJan_NH]

Unfortunately that doesn't definitively decide either way. My Bushmaster AR has a commercial buffer extension tube, yet I run a milspec Colt H buffer and spring inside of it. The inside dimensions of either buffer extension are nearly identical-it's the outer diameter of the two tubes that are different

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Posted: 6/13/2009 2:29:52 AM EST
Originally Posted By CJan_NH:

Unfortunately that doesn't definitively decide either way. My Bushmaster AR has a commercial buffer extension tube, yet I run a milspec Colt H buffer and spring inside of it. The inside dimensions of either buffer extension are nearly identical-it's the outer diameter of the two tubes that are different



Correct. The buffer and spring may be mil-spec, but what about the tube?
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Posted: 6/14/2009 4:34:45 AM EST
Anyone?
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Posted: 6/14/2009 5:04:40 AM EST
Measure... Magpul has the exact dimensions on their site. Navigate to the CTR and there's a nice diagram.
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Posted: 6/14/2009 5:22:00 AM EST
Don't have mine yet, just hoping someone already knew.
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Posted: 6/14/2009 5:33:46 AM EST
If you are in that big of a hurry, buy both types & save he other for a future AR. LaRue tactical has a nice diagram on how to ID milspec & comercial tubes quickly without any tools/measuring. It's under the link for the CTR stock on there website.

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Posted: 6/14/2009 5:43:01 AM EST
Not in that big a hurry, just seeing if the answer lurks out there somewhere.
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Posted: 6/14/2009 6:33:57 AM EST
According to a post by gotm4 on Sigforum, it is a mil-spec extension.

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