Good explanation I found, better than mine...
Quote:
Just like the infamous and now banned "bump stocks", the FRT-15 works on basically the same principle. Pull the trigger and hold it back, the gun fires one round, the BCG moves rearward causing the hammer to reset the trigger, the "locking bar" (which looks an awful lot like an auto sear) locks the trigger, the BCG comes forward which disengages the "locking bar" allowing the cycle to continue. The operative part of that sequence is that the trigger is reset and must be pulled again for the next round to fire. It's a semi-auto trigger. You can fire a single shot or you can fire a whole bunch of single shots very rapidly.
This isn't a binary trigger. It fires a round only on the trigger pull, not on the pull and then on the release.
It's not a full auto trigger since the trigger is reset and must be pulled for each successive shot. Therefore, it doesn't meet the definition of "machine gun" per 26 USC 5845(b)
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