What is a replica gun?

Answer 1

Basically, a non-firing gun, which could be for a number of purposes. In countries with restrictive firearms laws, replicas may be the only way for people to be able to collect firearms. There's the "rubber ducky" replicas, which are a training aid - they're often used in bayonet training, in order to avoid risking damage to actual service rifles. In some cases, a replica is a real gun which has been modified to ensure it cannot fire. In others, it may be made with a rubber or aluminum body, and use components of real firearms.

These replica guns are also a great for antique collectors who cannot afford to buy a real gun, so at least they can have a gun in the form of replica. But beware of converting them to real guns as this is the illegal work to do.