Has anyone made an SPR out of their M&P? I put an 18" 1:8 twist match grade barrel on my M&P and have been using a Bushnell AR Optics 4.5-18x40. It's been serviceable.

I'd like to upgrade my scope. As awesome as it would be to have a $1,000+ optic, my budget is only $400.

What are you guys running on your SPR? Recommendations???