Quote History Quoted:
This is not entirely true. Gearheadworks offers a part you can put into the Tailhook Mod 2 to disable the furthest adjustment notch, so that it doesn't exceed the 13.5" LOP. SB Tactical has them for the SBA3 also.
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...and if your gun ever ends up in the hands of the alphabet agency, they'll just pull that little block out. Instantly it becomes "designed and intended to be fired from the shoulder".
Don't believe me?
In one of the FOIA documents they did essentially just that, forcibly screwing in a Shockwave blade setscrew as far back in the pistol tube as possible to "reclassify" a firearm.
They don't seem to care how YOU have it set up, they seem to only care how it COULD BE set up if the changes only require hand tools or is "easy".
See for yourself.
EDITED TO CORRECT LINK:
FOIA Doc dump #2Scribd P. 153: picture showing original predrilled hole for blade brace and new "forced" indent at rear
Scribd P 155-6: description of what they did.
Based on this, blocking the last hole with a plastic plug or epoxy (also easily removed - google it) is probably not a good strategy. Seems to me that the actual buffer tube needs to be shorter, the last hole welded shut, completely machined out, or something like that which is permanent so it cannot be used and it could NEVER reach the magical 13.5" LOP.
(I am not a lawyer, this is not legal advice.)