The chaps at 858Airsoft have added a review online (with videos) of the Marushin M500. The review covers a lot of ground, and also covers the design issue with the loading latch pivot pin:

858airsoft.com has just release it’s latest review, this one on the Marushin M500 8mm Gas shotgun. This review is an in-depth players review of the shotgun and it’s pros and cons. This review includes pictures and video. So if anyone is thinking about purchasing this Airsoft shotgun, this is a review that they will not want to miss. Tyler, (858Airsoft)

One of the most sought after CQB/CQC (Close Quarters Battle /
Combat) weapons in airsoft is the gas powered shot gun from
Marushin. If you have not seen one or went up against one in a
game.. you have yet to feel the adrenaline rush of going up against
one. Power wise, these shotguns have the same FPS as nice GNBB
pistol.. we’ll get into that later. Just the sound alone can
make a newbie start to sweat. Well.. we’re going to give you a
basic run down of this weapon. (858Airsoft)

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• Flecktarn updates and online competition - 2008
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• Airsoft Xtreme International Magazine Issue #7 - 2008
• Arena Industries Ver.2 Goggle 6mm BB impact test - 2008
• ECHO1 Mini Gun poster out, E-90 out & distributors wanted - 2008
• Mid-October news from ASG - 2008
• RedWolf customs and custom article - 2008
• DSR-1 and patch shots from GI - 2008
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• Forum news digest for Oct 26, 2008 - 2008