The weapons were allegedly found at the home of Patrick O’Mahoney, 41, in planned searches after Danny McGurk was gunned down.
Mr McGurk, 35, was shot dead when he opened the front door of his house at Ross Road in the Lower Falls area of west Belfast on Sunday.
Three men are believed to have pumped up to five bullets into his legs and chest just yards from his wife and children. The killing was reported to have followed a row between the victim and dissident republican terrorists operating in the area.
As police launched a murder probe, three men and a woman were taken in for questioning.
All of them were later released apart from O’Mahoney, of Beechmount Pass, west Belfast.
He was accused of possessing firearms with intent to endanger life, and explosives in suspicious circumstances.
The charges were brought by police who searched his home and a Jaguar car parked outside.
A .22 bolt action rifle, a .455 Webley revolver, a Libera-Vendeta converted blank-firing pistol and magazine and assorted ammunition were all allegedly discovered, Belfast Magistrates’ Court heard.
Detectives also claimed they found an explosive substance described in court as black powder and yellow powder.
A detective sergeant told the court that when charged O’Mahoney made no reply but the officer said he believed he could connect him with the offences.
But a lawyer for the accused also pointed out: “Isn’t it correct to say that Mr O’Mahoney has not been charged with regard to any offences arising out of the ongoing investigation into the murder of Daniel McGurk?”
The detective replied that this was correct. O’Mahoney was remanded in custody to appear again in court via video link on September 18.
Later, a High Court judge dismissed a request for a second post mortem examination of Mr McGurk’s body.
Mr O’Mahoney launched a legal bid after the coroner for greater Belfast, John Leckey, turned down his demand.
With the judicial review application turned down, the murder victim’s body is now due to be released for burial.