Technical Inspection Report
Receiver Markings; IHC on left, New Receiver on right.
This appears to be a casting.
This receiver will not enter a USGI stock, even a well-used one.
Op rod track edge;
Note the change in contour from rear to front.
What is this slotting in the top inside edge of the op rod track?
Note that this IHC receiver does not show the slotting
nor the change in contour.
Left Bolt Lug Recess Contour;
note the gross difference with the IHC receiver (above).
Right Bolt Lug Fit;
New Receiver on left, IHC Receiver on right.
Compare the firing pin clearance cut on the IHC receiver on the left
with the new receiver on the right.
This lack of proper clearance can cause the firing pin tail to be "hammer welded" to the rear of the bolt, defeating firing pin retract.
This is very dangerous.
New Receiver below, IHC above.