It's probably possible after buying a new barrel, mag tube, elevator and ejector assembly but why? A NIB Mossberg 20 gauge can be purchased for less than the parts needed to have a gunsmith do the above, about $250 @ Buds Gunshop. __________________
"His nuts...they gone." - Karen "Bullseye" Smith
"A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government." - George Washington | 
Mossberg 500 12 gauge to 20 gauge conversion
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