Kel-tec Sub 2000
The SUB 2000 maybe the handiest rifle around. Folding design that store to less than 16 inches. Comes in 9mm or .40S&W versions with mag choices as follows:
9mm: Glock 17, Glock 19, S&W 59, Beretta 92, SIG 226
40S&W: Glock 22, S&W 4006, Beretta 96, SIG 226
This fun to shoot rifle works great to plink, backpack, or home defence.