An assassin who gunned down a bikie boss allegedly at the request of a rival, now on trial for the murder, has recalled the moment he pulled the trigger.

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The former soldier, who cannot be named for legal reasons, shot dead senior Rebels bikie Nick Martin at Perth Motorplex on December 12, 2020 in a sniper-style attack.

The ex-army reservist, 39, told the murder trial of David James Pye, 43, who allegedly paid $100,000 for the hit at the race track, that he stalked Martin before killing him.

"I went to (his) address multiple times and I tailed

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