The M7 NGSW (Sig Spear MCX) exhibits lower reliability in mud compared to the AR-15. While performing a five-round string with the dust cover closed after submersion, it functioned flawlessly. However, with the dust cover open, it failed to cycle after the first round and subsequently failed to go into battery due to mud ingress. This is attributed to the AR-15's gas venting system compared to the piston-actuated Sig Spear.
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