Nikon P223 3x9x40 has worked beautifully on my MP 15 Sport.
Was an irresistibly inexpensive $89.00 sale item I scooped up. They sell for nearly double that.
The other inexpensive scope I like is the Weaver Kaspa 3X12x50.
Nice optics with great light gathering and resolution. It works well on
a Savage M10.
These are inexpensive scopes with a warranty.
I would love to afford big buck scopes but I am happy with the performance of these 2.
Jim