It's getting really old really fast the amount of LEO's who don't know jack shit about the laws they are sworn to enforce. RSA 207:4 "silencing devices" was repealed in 2016.
207:4 Silencing Devices. – Repealed 2016, 234:2, I, eff. June 10, 2016.
Another common fun & games misinformation tidbit is that you can't have more than a 5 rd magazine in any semi automatic rifle. That is incorrect, you cannot have more than 5 rds in any size/capacity magazine (+1 in the chamber making 6 rds total) and .22 rimfire is excluded.
207:3 Lawful Methods of Taking. –
I. Wildlife shall be taken in the daytime between 1/2 hour before sunrise and 1/2 hour after sunset with a gun fired at arm's length or bow and arrow, unless otherwise specifically permitted.
II. A full automatic rifle shall not be used at any time nor shall a semi-automatic rifle be used to which is attached a magazine or clip holding more than 5 cartridges, nor shall a full jacketed metal case bullet be used, either in its original form or any alteration thereof.
III. Paragraph II shall not apply to the use of .22 or smaller caliber rimfire firearms.
IV. A person may take wildlife during the open season therefor with the aid of a dog, unless otherwise specifically prohibited.
Source. 1935, 124:1. RL 241:3. 1945, 146:1. RSA 207:3. 1977, 247:2. 2006, 19:1, eff. May 22, 2006.
When asking LEO's about any law ask them for specific RSA numbers. Odds are they won't be able to tell you them.
NH fun & games are some of the biggest clowns going and their gestapo mentality is the main reason I haven't hunted or fished in years. Not to mention the price of licenses now. They seriously need to be disbanded.
If you have any RSA questions there are link in the "important threads" section above.