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Question on OAL of SBS for form 1.

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"The ATF procedure for measuring barrel length is to measure from the closed bolt (or breech-face) to

the furthermost end of the barrel or permanently attached muzzle device. Permanent methods of

attachment include full-fusion gas or electric steel-seam welding, high-temperature (1100°F) silver

soldering, or blind pinning with the pin head welded over. 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furthermost end of the barrel or permanently attached muzzle device, withdrawn from the barrel, and



"The overall length of a firearm is the distance between the muzzle of the barrel and the rearmost portion

of the weapon measured on a line parallel to the axis of the bore."

Edited by KevinInNM
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