Just buy one. Lol. The 7” one isn’t very big and fits nicely in a backpack when folded. I don’t have numbers in front of me but I’d guess an S1 with the foldy foldy brace is about the same length as the short barrel with the collapsible stock because that thing sticks way out past the back of the gun. Plus the 7” barrel gives the 9mm a little extra oomph.
I promise it’s not that big (that’s what I told her?!)
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