Well not having recieved my 15-22 yet, I can not answer your question completely. If it is similar to the standard AR, there are no modifications that need to be done at all to add the BAD lever. I have one on my AR and it takes about 30 seconds to install with no mods needed at all. I don't know if this is true for the 15-22, but I will be getting one and installing it when I receive my rifle.

HTH

__________________
ΜΟΛΩΝ ΛΑΒΕ
Paracordwraps