I am not flaming your brother's choice of firearm. To each their own.
I would suggest that he sell it and learn.
When one places hard earned money down a firearm, the cheapest and most beneficial thing to do is research to find out if aftermarket parts and accessories are readily available.
Ask the people who purchased the Bren Ten.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)