As great as Glocks are he still needs to find what fits him and what he is comfortable with. Personally I like 9mm as they are fairly inexpensive to shoot and plenty of different ammo for them. Also alot of options out there. Beretta, Glock, Springfield Armory, Sig, Taurus and a whole slew of others. Find the shop with the biggest inventory and start feeling them up.
If he is a revolver fan and that's what he finds that fits him....well, I can't help.
If he is a revolver fan and that's what he finds that fits him....well, I can't help.