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Here is text from letter I haven't been able to confirm regarding measuring weapon with brace:IIRC, it's not so much OAL as "minimum fireable length"--tube end to muzzle crown, unless you pin-and-solder your MD. IANAL or an ATF jackboot, though... Some of the 26" argument is because ATF made Auto-Ordnance stretch the Pistol Thompson by 3" for an "approved" VFG config.
"This is in reply to your recent email to the Firearms Industry Programs Branch (FIPB) Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) seeking information on measuring the overall length of a pistol fitted with an arm stabilizing brace.
Regarding muzzle devices (silencers, flash suppressors or muzzle breaks etc.)Provided that an added muzzle device was permanently attached and completely non-removable it would count towards the overall length and barrel length of the weapon it was permanently attached too.
No specific torque amount is used to determine if a muzzle device is permanently attached. It is the method of attachment which is utilized to determine if the muzzle device is permanently attached. In order to be considered as "permanently attached" a muzzle device would have to be attached to a weapons barrel by means of welding, high-temperature (1100º F) silver soldering; or blind pinning.
Overall length is measured from the end of the arm stabilizing brace to the end of the barrel, be sure that the weapon is level, a large framing square can help with this. If a vertical forward grip is fitted and the stabilizing brace is needed to keep the pistols overall length at 26 inches or greater then the vertical forward grip must be removed before the stabilizing brace. If a vertical forward grip is placed on a pistol which is less than 26 inches in overall length an "any other weapon" (AOW) is created. Creating an AOW without first completing the proper NFA forms, paying the required 200.00 tax and receiving approval from the ATF NFA Branch is unlawful and would subject the violator to arrest and prosecution. We thank you for your inquiry and trust that the foregoing has been responsive to your evaluation request.
Michael S Knapp Program Manager Bureau of Alcohol, Tobacco, Firearms and Explosives Firearms and Explosives Industry Division"