Hi Kevin, there are many choices. Mossberg includes the Vortex Crossfire II 3-9x40mm on some models, but it is not in stock at Bud's .
Here are 3 different models to choose from opticsplanet.com/vortex-crossfire-ii-3-9x40mm-rifle-scope.html?_iv_code=VX-RS-XCVP8-CF2-31025
Stay safe & have a great day!

Hi Kevin and welcome. I would put a .308 calibrated scope for best ranging accuracy out to 800 yards (Primary Arms ACSS Reticle) amazon.com/Primary-Arms-4-14x44-Hunting-Reticle/dp/B00XWCNDYI/ref=sr_1_2_sspa?crid=1RL9I52LSA6AI&dib=eyJ2IjoiMSJ9.W_da_QDNRXNf81xsuazOUvLj6_jzSX6YbUfDlQA-E4AauCedNLPKOOmLb9x1Mb1XI9_8sl_qZBxmwBmvQ1mrm1EIvfYs4uTzXTIm16SLqD9h3ocDo_ZlRCARwIdsbY0gOQQsVE1xh3N3HR4Jz_yuZgUbeY0Q1D7PIdqowaLX6XN5GiUM-MHnLYiTc49ot5m8l5jF5maecrwhaFxapPEL7Ys27a2ZHOMe_otlevKlxj4KvhMBzIR3uc3kBuzbhD9LyO_jvWoDYivrrVKZRO4xiVIT_RUMpLcBFriqkCxEvXA.1AGCycHiRNFOhCW99bCiMRXg1aiCRb4q5d7UPJ1wrGw&dib_tag=se&keywords=Primary%2BArms%2BACSS%2Bscope&qid=1726838741&s=sporting-goods&sprefix=primary%2Barms%2Bacss%2Bscope%2Csporting%2C68&sr=1-2-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&th=1