My dad and I own a Glock 17L 9mm. but one the side of the barrel, it says "Brigada Anti-Terrorista" which is Spanish for Anti-terrorism Squad, and I assume it comes from a predominantly Spanish speaking country. I have done TONS of research on the marking on the gun and haven't found anything on it. I'm wondering if this is authentic, and does it add any value? EDIT: i believe it is a 1st or 2nd gen. gun as it doesn't have the accessory rail like newer models, and the handle is an older style. i believe it is from 1991-1995. just an educated guess. can anyone help?