Summary

this is a kit to turn the boring, unreliable spring nerf/gel bead/ airsoft grenade into a m16 stick grenade. The first modern version of the stick grenade, also known as the mod24/m24. now you do need to buy this amazon product to be able to print them out however.
single grenade
https://www.amazon.com/dp/B08PFDN8YX/ref=twister_B09J8BZCZ4?_encoding=UTF8&th=1

double grenade
https://www.amazon.com/dp/B08PFC5JDV/ref=sspa_dk_detail_1?psc=1&pd_rd_i=B08PFC5JDV&pd_rd_w=rYgyX&content-id=amzn1.sym.eb7c1ac5-7c51-4df5-ba34-ca810f1f119a&pf_rd_p=eb7c1ac5-7c51-4df5-ba34-ca810f1f119a&pf_rd_r=JK3XN86KG75CMWP1ATC2&pd_rd_wg=5MXDK&pd_rd_r=812dce8a-eaa8-455e-93b6-ab15131d37d1&s=toys-and-games&sp_csd=d2lkZ2V0TmFtZT1zcF9kZXRhaWw

I have used these before during airsoft and they work amazingly and did not break easily.