BudsGunShop.com - Barrel length

The 500 barrel that steve referenced will not work the 500 is a pump I suggest that you call Mossberg and see what Barrels are available for the sa-20 Customer service: +1 8003633555

Victor Mossberg has 18.5" barrels without the front rifle sight. Some other option : budsgunshop.com/catalog/product_info.php/products_id/415002953/Stoeger+M3020+20GA+18.5%5C+Synthetic+Shotgun+31872

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Mossberg doesn't make a youth 18 inch model

Hi Victor, Yes they do make one but 18.5 inch - mossberg.com/store/500-20-gauge-security-barrel-bead-sight-18-5-matte-finish-10301mt.html