[alanint]

Fitting ANY kind of stock to your pistol would make it an Illegal SBR, (Short Barreled Rifle). Adding a long barrel could make it legal, but it would have to be 16" long, not 8". The deal is that although you may use a reproduction stock to complete an "authentic" Naval or Artillery rig, you CANNOT fake the pistol to look like a Navy or Artillery, unless ALL the pistols components are period and correct. As an example, if you had an 8" Navy style barrel but not the correct back sight, etc. you might be in violation. My belief is that the pistol itself must be a period piece and correct example of a pistol which was once issued with a stock. This is a hazy area that I would not want to push ATF on.