Recently, fellow TFB writer Lynndon Schooler and I had the opportunity to visit the Zastava factory in Kragujevac to see their latest weapons and explore their vast collection of historical firearms.The modular M19/M20 rifle was the highlight of the trip.The design allows the shooter to change caliber within mere seconds without any tools.The barrel attachment mechanism is simple and effective, which will be appreciated by those who were unfortunate enough to change a barrel on a standard AK.You can read more about it in the recent article by Lynndon Schooler.