Pick up a BREN - not much heavier than an SLR, a quick change barrel, and a magazine half as heavy again as an SLR.
Then pick up a Lewis, at least twice the weight, and a non-changeable barrel. Pity the poor guys who had to load an overwing Lewis on an SE5 in WW1 in a 120+ MPH gale...
Not modelled in SP games. But then again - at this battalion scale we
really only should have Rifle, SLR, SMG, Assault Rifle, LMG. No pesky pistols - irrelevant. No individual names - an SMLE is exactly the same as a Kar98 at this scale. Just like normal 1/300 tabletop wargames rules handle small arms. The difference in stats of a point here or there are just meaningless trivia that only serve to bring out the train spotters really

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Andy