The 44-year-old is accused of getting into an altercation with his brother at a house in Nelson Bay on Saturday night.
He was later arrested at Shoal Bay after he allegedly refused to submit to a breath test.
Police say a subsequent search of his car uncovered a shotgun and 150 rounds of ammunition.
The items were seized and Diamond was taken to Raymond Terrace Police Station where a breath analysis allegedly returned a reading in the high range of 0.159, or more than 3 times the legal limit.
He's had his gun and driving licenses have been suspended and police have charged him with high range drink driving, not keep firearm safe or and handle or use firearm while under the influence of alcohol.
Diamond has been granted conditional bail to face Raymond Terrace Local Court on Tues 7 June 2016.
Meanwhile, his brother has also taken out an apprehended violence order against him.
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| Michael Diamond Photo courtesy Sydney Morning Herald |
