SEMIAUTOMATIC FIRE CONTROL IN OPEN BOLT. EASY FOR DIY.

Here are some samples of elegant semiautomatic ( and sometimes select fire) solutions of fire control found on the web/youtube. Most of them easily DIY reproducible. Many thanks and credits to the talented home style and professional gunsmiths who created these designs. I always wanted to put such a compendium together. I would appreciate suggestions of other simple or even simpler designs , with links please. Thanks for watching.