Building a 10mm AR pistol with a 5.5” barrel. Mainly just for fun. Maybe my woods gun if I am happy with how it runs.
What optic would you put on it?

Vortex Sparc. For the money, you're not going to beat it for a combination of durability and cost.

We've started issuing them as a duty optic.

I've got a Trijicon RMo on my CMMG Banshee 10mm AR pistol. That stated, I have been using a Vortex SPARC on my M1 carbine for 8+ years and it has always been good to go and held zero.

Wait, I have a 10mm AR????

I'm hard on SIGs Optics department, but the Romeo 5 is a great little optic. It's on my 9MM SBR AR after spending some time on a training AR-15, and if I didn't already have an MRO on my Scorpion pistol, it would have a Romeo 5.

They make a version that is oddly similar to the Vortex Sparc AR as well... likely all made by the same OEM provider to the companies individual specs.

i have a C-more railway on my AR pistol, I have a Dolos Pantheon barrel swap system on it, and can swap barrels in a few seconds...so it’s 5.56 and 300 blackout.

I haven’t managed to break it, so it’s pretty robust.