I didn't mean sitting back as a member of the rubber gun squad. I jsut didn't knwo if you were making entry or setting the perimeter.
Anyway, I know exactly what you are talking about with the 16" in a vehicle. I went to the M4 14.5 so that I could move the weapon around in the vehicle, have it readily available, and minimize the snagging getting out.
As for taking fire from meth houses, I can see where that would be a problem, and in rural areas there will be some open terrain. In my area we have a lot of cattle pasture, cotton, corn, wheat, and hay fields. Also lots of rolling terrain.
You just need to think about whether it's safer and more effective to get out of the immediate danger area if the fire is ineffective and call in or if the situation merits returning fire. Liability grows exponentially over a few hundred yards.