ShootAndHunt
Member
- Joined
- Dec 5, 2003
- Messages
- 241
Just wondering whether the uppers and lowers of the M4 and M16 are compatible or not. i.e. could you put a M4 upper on a M16 lower, or put a M16 upper on a M4 lower?
I am asking this because they look alike, but there are also some differences, for example the buffer and the action return spring are very different, (and others please remind me), this may introduce some differences to the action function. will these differences cause any problem when you interchange the uppers and lowers of M4 and M16? Anyone has some experiences?
I am asking this because they look alike, but there are also some differences, for example the buffer and the action return spring are very different, (and others please remind me), this may introduce some differences to the action function. will these differences cause any problem when you interchange the uppers and lowers of M4 and M16? Anyone has some experiences?