carnaby
Member
Surfing the web and had a thought after reading ATF documentation on their measurement procedure for the determination of the classification of a rifle as an NFA SBR or not...
To what precision does the ATF make this measurement? Their docs say:
The text in red has me concerned. Suppose I build an AR15 upper that when marked and measured with 0.01" precision comes out exactly 16.0". Will the ATF make the measurement with the same care? Is it feasible that they could make a measurement with 0.1" precision and come out 15.95"? If that happened would I be in trouble, or would they acknowledge that it's within reasonable measurement precision and not worry about it?
How close is close enough to be safe and certain one won't run afoul of the law?
To what precision does the ATF make this measurement? Their docs say:
Barrels are measured by inserting a dowel rod into the barrel until the rod stops against the bolt or breech-face. The rod is then marked at the furthermost end of the barrel or permanently attached muzzle device, withdrawn from the barrel, and measured.
The text in red has me concerned. Suppose I build an AR15 upper that when marked and measured with 0.01" precision comes out exactly 16.0". Will the ATF make the measurement with the same care? Is it feasible that they could make a measurement with 0.1" precision and come out 15.95"? If that happened would I be in trouble, or would they acknowledge that it's within reasonable measurement precision and not worry about it?
How close is close enough to be safe and certain one won't run afoul of the law?