They're both wrong, let me explain: First heavy machine guns: they usually are stationary, there are ones that can weight more than 30 kilograms, have a great stopping power (which means that they require one shot to kill a normal infantry man). Because of their size and weight they're not practical so they won't be used by us guardians. Then we got light machine guns, these ones have all the mobility and the lightness that the previous ones don't have, but they usually use the same caliber as normal infantry weapons, so they don't have that much stopping power as HMG's do, also they tend to have rate of fires that surpass the 750 rpm to compensate the lack of power, but because of this they get jammed more often and require you to change the barrel almost each 1000~2000 shots fired. Because of this reasons they're no not efficient enough to satisfy the war of the future. So from what I just said if they're not LMG or HMG, what are they? Destiny's machine guns have obviously more impact than our primary weapons and have a lower rate of fire (usually) than 750 rpm, but they're mobile enough to be operated by one single person (in these case, our guardians). My answer is [b]general purpose machine guns[/b], these type of machine guns combine the punch of HMG's and the mobility of the LMG's, also the fit all of the characteristics of the machine guns in destiny, examples of these type of machine gun are the MG42, the M240 (FN MAG), the M60 and the PKP Pecheneg. So there you go, we've been wrk g these whole time and know guardians when know the truth. If you detect any grammar misspelling please comment so I can correct it, English isn't my mother language and I'm still studying it Thanks to everybody that read it till the end.