After a Picatinny buttstock my G&G PRK9 mini, check out the pic for how it mounts – after the whole buttstock
Any type considered, but would like something folding if poss, just for storage
This is a good example
https://shop.jkarmy.com/5ku-folding-visor-stock-for-mcx-m1913-20mm-rail-black-1.html