SpoeGain Heavy-Duty Pistol Sight Pusher Tool for Front and Rear Sight Removal Adjustment, Fits Most Slides, Comes with 6 Pairs of Slide Washers and 4 Interchangeable Pushers

glocks don't really need one, just use some brass punch and that rear should move. But if you need one, I have this one and has worked on stubborn sights such as the echelon.https://www.amazon.com/dp/B0FW9ZZCVW?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_4