There was a time that they would sell kits and the purchaser would have to cut out the receiver and shape it. They have their uses in the original guise as a military weapon, but I really don't see too many showing up on the range.
A firearm is like a car. When you see Toyotas and Hondas all over the place, one could think that they are good all around cars. If you see only one Yugo, then.....
And I look at purchasing a firearm the same as a car. I look in the back and if I see a number of the same model on the racks getting repaired, guess which model I am not going to buy.
(30 round mags are cheaper than another handgun)
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)