Visuals: At the four star level, it'll be the same color as the antigua, but with snipe on it. At the five star level, two snipes.
Stat bars: It'll have mostly the same stats as the Sentenza and Argent Peacemaker, but with either piercing or normal. Same damage stat, slightly better speed stat, same six bullets.
Charge attack: Same as the others. Six bullets, then a giant snipe. Realistically, it won't be used much, but niether are the current ones and that's apparently balanced enough to not be changed.