I have 2 versions, one with the 1776 and stars and 1 without. Printed with no supports just have the slotted side towards the top. I printed at 25% infill, 0.2 layer height on my Bambu Labs P1S and on Ender 3 S1 and both versions turned out great. Mag holder on the bottom was made to fit TorkMags, Pmags fit as well but aren't as tight fitting but have no issues staying in.