Not me - most of my time was southwest of Danang in and around Hill 55 ("Dodge City"). The enemy had some bunker systems, including some made of concrete. We had lots of older graveyards in the area and the M-14 could penetrate those concrete gravestones easily. House walls were not a problem and heavy foliage didn't deflect the 7.62mm stuff much.
The '14 was long and heavier but, ooh could it shoot!