| The Olympic receiver has sloppy machine marks. The unique and non-standard machine marks suggest this receiver was manufactured using the same programming as the Williams Arms receiver. The Williams Arms receiver is reviewed separately.
Areas that are identical to the Williams Arms aluminum receiver are the typically metric lightening cut on an inch receiver, the hole in the bottom of the receiver, the cut at the front of the pivot hole, the step at the rear, the stress relief hole at the end of the cocking handle cut (shown below), and other tool marks.
The locking lug is not cut straight. This is not a shadow indicated by the arrows, but an out-of alignment cut. The correct way to fit an upper receiver to a lower is with a different sized locking body. Doing so, however, requires a few minutes to disassemble and reassembly of the lower. Apparently, the assembler thought it more expedient to just file the receiver.
The white outline indicate an upward bulge on the internal receiver rails that causes a difficult lockup. It is not apparent to me what caused this bulging. The feedramp geometry appears correct.
Note inch pattern magazine well. While a metric magazine will fit in an inch magazine well, there is little if any front support for the magazine and it is common to get stoppages from the rounds nose-diving and striking the bottom of the barrel face, missing the feedramp. It is my opinion that those advertising inch pattern magazine wells to work with metric magazines are not telling the whole truth. Yes they will fit. Yes they will often work. But they are not as reliable as using the correct magazine.
This circular cut at the end of the cocking slide groove is identical on the Olympic and Williams, but not present on any other. It appears to relieve stress from this junction and is probably an improvement.
Radius cut for head of hinge pin indicated by the two arrows is too small, causing the hinge pin to bind. On this sample, someone pounded the hinge pin in anyway and this caused the shaft to distort. Hole also is not concentric and is undersize on the left side causing even a new hinge pin to bind. Note the Olympic and Williams both have the same round cut indicated by the arrow, which on licensed receivers is square. This is further indication of common history between these two receiver.
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