You will need to consult a lawyer familiar with NH law to get a legal and correct answer.
one year in prison and probabion
possession of a firearm
Simple possession of Oxycodone is a 3rd-degree felony punishable by up to 5 years in state prison. Since mandatory minimum prison sentences apply to trafficking charges, the amount in possession must be under 4 grams, or else it may be considered trafficking.
Prison. Felons cannot legally be in possession of a firearm.
Difficult to answer - too much is unknown. You can be pretty sure that they will be returned to jail/prison to serve the remainder of their original sentence. In the meantime they will be charged and tried for the firearm possession offense, and that sentence will probably be added onto the top of their original sentence. If the felon was charged under the federal statute they could be imprisoned for up to 15 years on the firearm charge alone.
No. Convicted felons are prohibited from being "in possession" of a firearm. The law considers proximity to a firearm as being "in possession." STAY WAWAY FROM THEM unless you want to look at the possibility of another 15 years in federal prison.
Life
The average sentence for marijuana possession in the US can vary widely depending on the state and quantity involved. In general, sentences for simple possession can range from probation and fines to a few days in jail, with more severe penalties for larger quantities or repeat offenses. Some states have decriminalized possession of small amounts, leading to reduced penalties or alternative sentencing options.
They'll go back to prison. It's a felony in itself for a felon to be in possession of a firearm.
CAUTION: In addition to whatever state sentence may be applicable in NM for violation of NM's state laws it is also be FEDERAL felony offense for a convicted felon to ever own or possess a firearm. The United States Code, in some cases, makes the penalty for illegal possession of a firearm a mandatory minimum fifteen (15) years in prison. Title 18 U.S.C. sec 924(e)(1).
Federal law. 5 yrs, Federal prison, no probation, no parole. See Operation Exile.
Actual sentence is up to the judge. It IS a serious felony- but possession of a firearm with an obliterated serial number is also a FEDERAL crime- 5-10 yrs in a Federal prison.