Machine Gun is the basic title of the fully automatic combat rifles. Compared to the more common burst firing assault-rifle-type varient machineguns tend to have larger magazines, reduced base accuracy, and only rarely will these weapons sport a scope. Hitting harder than SMGs, machineguns balance this by featuring increased recoil reduction (especially when sighted) and a longer reload time. Like SMGs, machineguns run an entire range of rates of fire; starting at 4.1 rounds a second all the way up to 10.1 rounds a second. Magazine tends to be average, with a minimum of 24 rounds before reload going all the way up to 80+ for certain S&S models.
Examples are on the talk page.