This is "rooster" bolt and i have not tested this during play. Please make sure this fits and moves correctly in your gun before you use it. I had a couple version blow up in my gun when dry firing so check it. User beware on how this works because i do not know. the model is like 90% perfect and it does help with the ball rolling back.
pin on amazon: https://www.amazon.com/gp/product/B07YKXTNNB/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1