Although an CT machine is an X-ray, the type of images it produces are not like the ones the OP posted. Imagines tend to be slices of whatever is being scanned. What the OP linked to is standard X-Ray images. Examining the picture of the MM23E it is apparent that that gun was laid on its side, and not "CT'd" like the picture implies. The flat lay of the ammunition belt is the give-away.
Also, considering the clarity of the image through the metal, I suspect the output of the xray machine that produced those images is far outside that of most medical X-ray equipment, other than perhaps an radiation-oncology linear accelerator, again $2.5 million price range for one.
The factors raising doubt of these images being made by a medical x-ray machine is that the good penetration by x-ray of the metal parts causing them to be pictured as light hues of grey. From looking at most any medical X-ray, any metal implants are almost always stark white because they block nearly 100% of the xray radiation. To get penetrating x-rays of thick steel components, like gun barrels and bolts, would seem to take much more energy that a standard x-ray machine could deliver.
Considering the website that hosts these images screams "BUY OUR T-SHIRTS!!" everywhere, I suspect an ulterior motive at work here, but perhaps I just need to readjust my tin-foil hat.
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