Finding a Twin Post Reticle scope in 4×36 for running target shooting can be challenging since they’re quite rare. You might want to check with specialty optics retailers or browse used gear listings on platforms like eBay and airgun forums. If the twin post isn’t available, a German #4 or heavy duplex reticle could be a good alternative for quick target acquisition. Some manufacturers also offer custom reticle options, so it may be worth reaching out to them directly.
Good luck with your search — I hope you find what you’re looking for. If I come across anything suitable, I’ll be sure to