Except that the Heavy Stubber isn't an option for the IG in 40k, except as a pintle-mounted weapon on a vehicle. For modeling opportunity, a notably different Lasgun would be better anyway.
Also, it means that there's yet another type of ammunition in the supply pipeline. With a 'BAR' - type lasgun, it could be set up to use either the standard lasgun powerpack for that Regiment, or a larger powerpack like what a Lascannon uses (ideally, it'd use both, like the M249 SAW/FN Minimi can).
Fluff-wise (and a bit of history), a 'Squad Automatic Weapon' should fire the same round as the standard infantry weapon (BAR and M1 Garand were .30-06, M249 and M16 are 5.56mm). This simplifies logistics tremendously, something that's even more important when your supply lines are light-years in length (which Gaunt's Ghosts novel was it where the Tanith regiment couldn't get the proper powerpacks? Straight Silver?). The early M14s were essentially lighter versions of the BAR (same basic design, just fired a slightly smaller round, 7.62x51mm instead of 7.62x58?mm), but were too light to really be controllable in burst fire. However, that still effectively gave every rifleman a 'BAR', and then the squad Machinegunner carried the beast (M60 light machine gun). The M60 is NOT a SAW, it's always been considered a Light Machine Gun (Heavy Stubber or Heavy Bolter in 40k terms), even though it fired the same cartridge as the M14 (an M60 is capable of some pretty extended periods of sustained fire, with the easily exchangeable barrel, while SAWs are generally not, since the barrel on an M249 needs to be unscrewed. That's not easy to do, especially when the barrel's over 250*F!).
_________________ "For the Lion and the Emperor!"
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