u/BeginningReady4907

Hello, i am building a small cigar sized rocket, but my only problem is the fuel composition, since its so small (10mm ID) its hard to pour in any mixture, i´ve tried funnels but they clog, my composition has been erythritol / Potassium Nitrate / Red Iron Oxide and glycerine to make pouring easier, i will buy sorbitol but between sucrose and erythritol what would yall advice? thanks

I have a 22lr ECM barrel thats has a 15mm OD, i was looking into the MP22k since u can make the bolt fully by hand with some steel plates, but they use a very thin barrel liner instead of a thick barrel, any similar build or a mod for the MP22 that i could use? thanks