Dude, you're unclear on the concept. Way too much work.
07FFL gets spare barrel(s) and welds wider-bore extensions on to the bbl to get min bbl length to at least 6" and also get min overall length of gun to 10.5". He does ensure barrel concentricity exists and no obstructions are present. The mag catch is replaced with a screw retainer or some other non-finger-manipulable device, and a zero-round magazine (or some kinda 'blue gun' training magazine) is installed so the gun has zero round capacity outside the chamber.
The buyer buys/DROSes the Roster-exempt single-shot pistol, walks out the door, and returns 1 minute later for gunsmithing services to exchange the long barrel for the standard length one. Any zero-round filler magazine he might
07FFL gets spare barrel(s) and welds wider-bore extensions on to the bbl to get min bbl length to at least 6" and also get min overall length of gun to 10.5". He does ensure barrel concentricity exists and no obstructions are present. The mag catch is replaced with a screw retainer or some other non-finger-manipulable device, and a zero-round magazine (or some kinda 'blue gun' training magazine) is installed so the gun has zero round capacity outside the chamber.
The buyer buys/DROSes the Roster-exempt single-shot pistol, walks out the door, and returns 1 minute later for gunsmithing services to exchange the long barrel for the standard length one. Any zero-round filler magazine he might

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