I followed the link above and ordered the 5.5 mm one from amazon. Arrived in two days! And yes, it does fit nicely down the bore of my .223. I downloaded VLC and when I plug the camera into my Mac, the LEDs light up, but I can seem to get a screen picture. Guess I'll have to wait until my son comes home from college and show this techno-idiot how to use it.
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