The question of whether a brace constitutes a "redesign" from the definitions of rifles or shotguns (e.g. "designed or redesigned, made or remade, and intended to be fired from the shoulder") has been addressed by the ATF. In their letter to SB Tactical's lawyer, the ATF indicated that a properly installed brace, which has not been altered, may be fired from other positions without necessarily "redesigning" it into an NFA item.
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