If you do it yourself1)realize "blind pin" has a whole other definition to the BATF than it does to a machinist. found that out by calling the BATF office of firearms technology.
After you lock it on with a blind pin,you must weld over the end of the pin,then dress it off so the weld can't be seen,to prevent "drilling it out"
I'm not suggesting it makes sense,I'm just reporting.
Don't forget to stack all the parts on the barrel,like the gas block/sight,or anything else that won't go over the muzzle device.
Just me,but I cannot comprehend the advantage of a 14 in bbl if you have to stick a pickle on it and make it 16