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Back in April 2022 I closed on talking about the, then, XM5 that SIG's plan might have been to get the MCX-Spear in the door and once the boondoggle nature of the 6.8x51mm's extreme chamber pressures and expensive case construction were impossible to deny...
"Hey, look we have almost the same gun in 5.56, the troops don't even have to learn new controls!" - SIG Marketing Dept.
Daosus in the comments wondered something similar when they mentioned that 6.8x51 is MUCH heavier than 5.56x45.
Something else the troops complained about was the small magazine size and SIG offered a 25 rounder. Using the SR-25 magwell means you can take advantage of a wider selection than proprietary magazines would.
But... Larger magazines don't cure the weight problem. 25% more of the same cartridge is 25% more mass.
A PMAG LR 25-rounder all loaded up is 1.5 lb. each, which isn't too much more than the 1.4 lb. 20-rounder, but still it's an additional 0.7 lb. to lug around to get an extra 35 rounds, or 175 total.
One gets the impression that the troops want their 210 round, 7 lb. ammo load back instead of a 140 round 9.8 lb. load or a 10.5 lb. 175 round load.
And even the lighter XM8 is still heavier than the M4...
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