These have turned out to be kind of fiddly to fit into an airsoft PR mag, which is what i wanted! They roughly double up front-back, i do like how you can feasibly fit 99 in there, but adding in enough to fill all the gaps and look right would add noticeable weight to an already chunky rifle.

I'm swapping them out for some nice Matsuo rounds i'm getting in a trade, so will probably put these up for trade soon anyway, but i'm still really curious where they're from? Who did them originally, designed e.t.c.

I'm sure i've seen them around the internet long before i bought this pack of them.