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The HK 21 already does exactly what you're suggesting. IIRC it wasn't great but it did the job (I worked with units that used them for recon/raid missions in El Salvador during their "unpleasantness"). Although they were easier to carry than the M-60s, they weren't much fun to shoot (too lightweight) and didn't seem to hold up to 3rd world abuse. In my AO (2nd Bde.) they were retired as quickly as teams got new/refurbished M-60s. (And we all have opinions about the M-60.) YMMV. Peregrino
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