M26 breaching shotgun
The M26 attaches to the M16 like the M203 does, it's primary function is breaching, there are optional stocks/pistol grips to make it a stand alone weapon. After the breach however you want suppressive fire (and a grenade) to allow the teams entry into the structure and avoid being bogged down in the fatal funnel.
Waiting on someone with mout training to chime in.
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