N NWdude83 New member May 25, 2011 #21 The 12" gas tube on a 20" barrel AR is about 2/3 the length. A mid-length gas tube is 9". On a 14.5" or 16" barrel AR thats about 2/3 the length...
The 12" gas tube on a 20" barrel AR is about 2/3 the length. A mid-length gas tube is 9". On a 14.5" or 16" barrel AR thats about 2/3 the length...
