I suspect that in reality they are using those strap on things as a buttstock, not tied to their wrist, in an attempt to thwart the BATF short barreled rifle definition. Put velcro on the buffer tube and take away the 90 degree part and no one would want one. Kind of like using a bump stock to have a full auto without all the hassle of buying and paying for a full auto.
I'm no fan of either.
dju
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