Thoughts on AR15 to22LR conversion kit

i love the 22 conversions.
i have one with a six inch barrel and Sparrow suppressor upper that is a regular visitor upon my full auto.
i also have a dedicated one with a 16 inch barrel.
i shoot bulk ammo and it has worked fine for years but i have had a problem breaking firing pins. i would say it is not a problem for a semi gun, probably just the auto. recently it has been FTF after a fired rd so i rack it and the same happens till it gets down from 25 rds to 19 or 20 in the mag. i think this is a mag issue or another pin is broken. even broken it will work till it doesnt. CMMG sells the pins. i have asked my PSA store but it isnt a big need for costumers other than me i guess.
with permission from the parent, i have put many huge smiles on the kids that run across me at the range. its a blast. i wonder if this will work? see auto 22 here.