Rio Royal Buck #1 Buck 12 Pellet 12 Gauge

A: James, yes Sir, no issues in the Maverick 88 or 590A1. Cheers and stay safe!

A: Mossberg Maverick 88's that I've shot have ran through everything I've fed them, these should chamber, fire and eject with no problem.

A: yes in most cases they will however EVERY gun is different I have 2 shotguns (remington 1100s) one of them hates and will not work with federal shells the other one is fine with them

A: Christopher, yes Sir. I have a RIA VR-80 and a Radical Arms NK1 Bullpup and these cycle very well. Cheers and stay safe!

A: Christopher, don't know exactly which gun you are talking about, but at 1345 fps, I doubt you will have any problems. I run RIO high velocity birdshot and slugs in my VR80 with no trouble. Generally, as long as you're over 1300 fps, you will be okay. Have a great day!

A: They should but all firearms are different so with any ammo it's a try and find out type deal. I could have the exact same brand ar shotgun as you and these could work great but constantly jam in yours. But you shouldn't have any issues with these. Hope this helps.