Guns seized in a raid on a Canberra home may have been used in a previous bikie-related shooting, prosecutors have said.

A hand grenade, automatic rifles, a bullet-proof vest and several other firearms were seized during police raids on Wednesday November 1, 2017.

The weapons were found at a home in Kneeshaw Street at Monash and taken by officers linked to ACT Policing's anti-bikie taskforce.

In total, three shotguns, two rifles, two automatic rifles, one hand grenade, and a bulletproof vest were found.

Aaron Graham (L) was granted bail on strict conditions. ( ABC News )

In addition to the weapons, a large amount of ammunition for the guns was found.

Aaron Graham, 24, was arrested following the raids, and appeared in court this morning.

Prosecutors alleged he was an associate of the Nomads bikie gang.

Police said they found a loaded shotgun in the car he used for work concealed beneath a jumper bearing insignia relating to the group.

During the court appearance, prosecutors alleged the weapons might be those used in a bikie-related shooting in Canberra earlier this year.

He was charged with a range of firearm offences, but granted bail on strict conditions that he not associate with members of the Nomads.

Another man will be summonsed over charges related to the possession of ammunition.

Editor's note (7/12/2018): All charges against Aaron Graham were dropped on December 7, 2018. Mr Graham's defence lawyer Peter Woodhouse said the police warrant did not authorise the search of the car and "as a result what was found was inadmissible". He said the police "crossed the line and as a result the prosecution failed". Mr Woodhouse said the AFP were ordered to reimburse Mr Graham's legal costs.