OK, ad fail.no you can get them short and rifled: https://www.gunadapters.com/12-gauge-to-9mm-luger-rifled-zombie-series/
or longer. this has an 8" barrel so even better ballistics than some pistols
12 gauge to 9mm Pathfinder Series
Pathfinder Series 12 Gauge to 9mm 8” Rifled Chamber Adapter. Sponsored by Dave Canterbury of “Dual Survival”. Our Most Accurate Adapter We Make!www.gunadapters.com12 gauge to .22 LR Pathfinder Series
Pathfinder Series 12 Gauge to .22 LR 8” Rifled Chamber Adapter. Sponsored by Dave Canterbury of “Dual Survival”. Our Most Accurate Adapter We Make!www.gunadapters.com
How can 12ga/9mm and 12ga/22lr both be ‘Our Most Accurate Adapter We Make!’ ?