User blog comment:Hayashi H/Advanced Equipment Guide/@comment-33019381-20160110220100/@comment-11937523-20160117214749

Pretty much irreplaceble by the OTO just due to the fact that arty spotting uses different formulas for yellow guns(if i understood the article correctly) as for how many copies: at least case would be 2 of 15.2, and 4 OTO, best to have 6 of each i guess