Come to think of it I only shot mine once with the folder and I got all cut up too. Since I might be able to find the time I'll get it out of the safe and check it out.
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For $250, it seems like the CNC ought to include a chamfer or something. Won't stop me from knocking the edge off that thing with a file, unless @KevinB tells us they're going to rev it and take care of that.
At this point I think we’re past just an opinion letter. A guy in Ohio was prosecuted for modifying a pistol brace which the US Attorney’s Office argued now had an LOP over 13.5”. The defendant was acquitted because the ATF examiner measured the LOP at a diagonal instead of parallel to the bore and a correct measurement resulted in a LOP just under 13.5”. I think we had a thread about the case last year.
If I recall correctly the guy in question had also modified his brace by putting a rubber cane tip in the end of it, allegedly to “make it more easily shoulderable.” I think the crux of it was the ATF argued that between the longer length of pull and the cane tip, the person in question had demonstrated intent to use the brace as a shoulder stock, versus happening to allow the brace to touch his shoulder incidentally.
In typical fashion gun laws are anything but simple.