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5
Make sure selector is set to "SMG". This drops the trip down
and makes it easier to install the upper. Hold upper
receiver with muzzle pointing down to prevent bolt
assembly from sliding out. Pull and hold trigger back while
installing the upper. Install upper by aligning the rear of
the upper receiver with the rear of the lower receiver,
keeping both receivers parallel. As you slide the upper
into the lower pay careful attention to not push the front
of the lower receiver into the trigger guard filler of the
upper receiver, or you may scratch the finish on your lower
receiver. If receiver will not install all of the way forward,
wiggle receiver up and down until it moves forward.
6
Align retaining pin hole and install retaining pin.
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