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AR15.COM
6/2/2008 5:03:06 PM EDT
Will the threads clear a 12" FF tube on this barrel?  
6/3/2008 12:00:16 PM EDT
[#1]

Quoted:
Will the threads clear a 12" FF tube on this barrel?  


 No it will not. Since the barrel is measured from the bolt face, and the rails are usually measured from where they contact the extension, there is slightly under 3/4" difference between the two "measure from" points. So, that means the rail will slightly cover the end of the barrel (by about 1/4").