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Good evening to you!! The Mossberg 990 shockwave receiver is drilled and tapped for optic mounting plates. You can mount a brace as long as it retains the oal of 26". Hope this helps. Have a good rest of your day.

Hi Phillip and welcome. Yes, you would need this picatinny rail mount: https://www.shotgunheatshield.com/mossberg-940-930-935-12-gauge-mount-picatinny-mount-milled-aluminum-torx-and-wrench/ ------------------------------ or a direct mount red dot adapter: https://www.gggaz.com/mossberg-940-pro-rmr-red-dot-scope-mount.html ----------------------- The picatinny rail gives you more optics options. A brace can be added as long as the overall length is a minimal of 26 inches. Cheers, stay safe and enjoy!

Yes, add optic with the addition of a piccatinny rail.
And, you may add a brace as LONG as you maintain a minimum length of 26".
Don't want the ATF comin' & bustin' down your door 😆

Yes, you can add an optic by adding a piccatinny rail. You can add a brace but remember it must maintain a minimum length of 26".

Hi Phillip, you can add optics by attaching this picatinny rail >>> amazon.com/Monstrum-Tactical-Mossberg-Shotgun-Picatinny/dp/B00ME8SZFS You can add a brace as long as you maintain at least a length of 26" >>> https://texasshooterssupply.com/product/tss-mossberg-500-590-maveric-arm-brace-sb3-type-2/ Stay safe & have a great day!