| ATF
has in just the last month made an official ruling that making a cut on
the bottom of the USC to allow for the full auto trip lever to reach the
bolt carrier (despite the fact that a full auto bolt can not readily be
installed in a USC without it itself being altered) is in fact making
the receiver a machine gun!!!
With this information it now confirms that the
UMP lowers have to have the full auto components removed and discarded
and that the area where they came out of does not have to be filled with
any blocks. If the receiver can not accept the full auto parts the lower
can not be installed on the receiver with these parts installed in the
lower. The modification to the upper receiver is the contraband
modification.
Buyer beware!!! If you are buying
or going to buy a USC from anyone make sure that the upper receiver has
not be cut to accept the full auto trip lever. Unlike a metal gun that
can be re-welded to repair a mistake, the new plastic guns (i.e. Hk USC)
can not be repaired. Ask for a photo of the bottom the receiver before
you send ANY MONEY TO ANYONE!!!
A recent customer bought a USC off of someone
and sent it in to me for some work. Once I saw the cut on the bottom of
the receiver I was required to contact ATF for determination. This USC
receiver is what the ATF used to make the ground braking decision. It is
now etched in stone for all to comply with.
Below is an illustration of what we are talking
about. Click on the thumbnails for a larger view.
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