AR -15 scope suggestions

[nmbullfighter]

hey there..i just got a remington r-15 varmint gun. i put a bushnell scope that i had that i will admit is a cheap scope on it..i sighted it in and it shoots tight groups at 200 yards but after about 40 shots it goes a foot high or low and i have to sight in again..i was thinking maybe a vortex diamond scope..what do you guys think? can the diamond handle it?

 

[eobigbull]

Checkout cameraland... great deals

 

[JPblind]

Have the exact same gun. Put a vortex diamondback tac 4-12×40 on mine and never had any problems. Been dusting coyotes with that setup for 5 years now.