This is easy: Ken-Tec SUB2000.\n\nGet it in a Glock mag config that matches what ya got already. Inexpensive and tons of fun!!\n\nFolds in half; fits in a backpack. 16.25 inches folded.\n\nhttps:\/\/www.keltecweapons.com\/rifles\/sub-2000\/\n\n\ni just picked one up in 9mm Glock for when were out and about in the desert on minibikes. its the size of small laptop.