40mm grenade launchers are NOT easy to get, they are classified as destructive devices and require an ATF Form 1. Unless you talk to ABC news, you’ll find out that not too many people have them.
So why do so many companies make barrels with M4 profiles, if very few of us have M203 grenade launchers?
My theory is that a lot of people simply want their rifle to be very close to what the Military uses. Whether or not they will be able to use aspects of the design is a moot point in their eyes.
Vuurwapen Blog has some great thoughts as usual (HERE)
Another good example of an aspect in design that few of us need, is the forward assist. Although I don’t shoot tens of thousands of rounds per year, I have never had to use it once and I’m sure most people can say the same. Although I do occasionally see some n00bs at the range that repeatedly hit the forward assist with authority :roll: , after they seat a fresh mag and drive the bolt home.