Look into the Sig Bravo3 (3X) and Sig Bravo5 (5X) prisms. Great clarity and flat edge-to-edge image with a great BDC horseshoe-dot reticle with ranging capability. Also has diopter for making images perfect crisp, whatever your vision. Reticles come in .308, 5.56, and .300blk and are $325 shipped from eurooptic.
Both have similar weight as the 3.5X ACOG. Both are about 1.5” shorter. They have a 40k advertised battery (along with shake awake) versus the ACOG’s 12k battery. The 3X Sig has almost double the FOV of the 3.5X ACOG and the 5X Sig still has MORE field of view than the 3.5X ACOG...
Sig Bravo3 = 52.5ft/100yd (10 deg)
Sig Bravo5 = 31.5ft/100yd (6 deg)
TA110 ACOG = 28.9ft/100yd (5.5 deg)
I literally sold my ACOG within a week of getting a Sig Bravo. No regerts yet.