Boy, 16, 'hit over head with gun during Sydney home invasion'

A 16-year-old boy was allegedly hit over the head with a gun during a home invasion in Sydney's south-west.

The teen suffered cuts after the attack in Chester Hill at 1.15am today.

He was alone with his younger brother at the Campbell Hill Road home when four men in masks smashed through a door to get in.

He was also allegedly tasared by the attackers and forced to hand over details for the home's safe.

Thieves then made off with jewellery and cash, plus CCTV footage.

Police are investigating.