Sounds like to me that you have one of the waterfowl guns , they along with the turkey guns were the only full camo 12 ga. that H&R produced . i do not beleive that they even do the full camo jobs any more , now they come with the Mossy Oak camo stock and forarm only .
You may want to give H&R a call to find out for sure , the number is in the FAQs at the top of the center fire forum .