Hi Brad and welcome. It is between a youth and full size as far as length of pull. It comes with (3) chokes Full, Modified and Improved Cylinder. Cheers and stay safe!

I would consider it a youth it has about 13 inch lop and comes with 3 chokes IC Mod AND fULL

Brad, it is compact, so it could be considered a youth gun, I can't find any info on the length of pull.
Barathrum SS20-C is a compact folding shotgun perfect for campers and hikers looking to bring a shotgun with them on their next adventure. The SS20's folding design makes it easy to pack into a backpack or camp while taking up minimal space. Picatinny rail comes pre-mounted ready for an optic to be easily attached or fiber optic front sight can be used. Ambidextrous cheek pad on stock allows comfort shooting for both left and right handed shooters. *****This is a perfect shotgun for turkey hunting as well as a kid's first shotgun.***** This shotgun includes improved cylinder, modified and full choke tubes with choke key.
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The SS20 20 Gauge Single Shot Shotgun features a 20" smooth bore barrel with a bead sight. Durable synthetic stock and handguard, fold-able stow-away firearm.
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• Single Shot break action shotgun
• Accepts 3" magnum 20 gauge shells
• 20’’ Barrel Threaded for Mobil Style Chokes
• 3 Chokes Included
• Manual Safety
• 4140 Steel Barrel
• Model does have shell extractor built in
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Stay safe & have a great day!