I have just built this grenade, it is my second instructable you can access my first instructable here https://www.instructables.com/id/Knex_rifle_PS49/
if you can make this better then tell me. you can make it look more realistic if you get a two way connector and take a blue rod and connect them together then stick the rod in the hole at the top.
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Step 1: The Parts
you will need:
8 yellow rods
16 red corner connectors
2 snowflake connectors
when putting things inside the grenade don't put in rods as they will just fall out
i have just used orange connectors, snowflake connectors and half circle connectors
Step 2: Building It
you will build the grenade
make as many of these as you want and rate it
if i get at least 3 and a half stars then i will post my current project.