https://x-grips.com/
SubCompact Pistol Magazine Adapters - X-GRIP Mag Adapter
pistol magazinex gripsubcompactadapters
https://www.instructables.com/Knex_pistol_with_magazine_and_folding_stock/
Knex Pistol With Magazine and Folding Stock : 8 Steps - Instructables
Knex Pistol With Magazine and Folding Stock: This is a Knex pistol I made. It fires grey connectors, has an eight round magazine or so, true trigger from Oompa...
with magazinefolding stock8 stepsknexpistol