yeah they are. There is a bit of paper work a $200.00 one time tax and a long wait but they are legal in most states. Check your state laws to make sure.
Here is my first (and so far only suppressed gun) its a Marlin 1895 SBL (45-70)
Shot placement is everything! I would rather take a round of 50BMG to the foot than a 22short to the base of the skull.
all 25 of my guns are 45/70 govt, 357 mag, 22 or 12 ga... I believe in keeping it simple