BSA…I’ve a full KIDD build I put together a while ago. You are correct about it not being terribly sensitive to ammo.
Mine shoots several varieties well and seems to love aguilla SV, which prompted me to acquire a gaggle of it back when it was about 225 a case. There will be the odd flyer with that ammo but the 8 or 9 out of 10 are usually nice and tight
I have a fair variety of rimfires to choose from and I can tell you the KIDD more often than not comes along.
It’s got a respectable round count and that’s going nowhere but up.it simply does not ever fail to feed fire or eject. Ever.
If lubed up and given a chance it will hang pretty damn well with some high falootin rifles.
It is without a doubt one of my favorite rimfires. A surgical brass spitting machine!
Crappy pic but….