The weight is due to more optical elements and beefier internals. As high mag scopes get shorter you need more glass to bend the light faster without distortion. The vortex gen 2 and 3 razors are similar.34 ounces is a tank of a scope. Holy Moses! The TRACT TORIC was 21 oz. and right in the 750 range for the BDC model.
TORIC UHD 3-15X42 BDC Rifle Scope
When it comes to low-light performance, the TORIC UHD 3-15x42 is alone in its class. Utilizing our proprietary Ultra High Definition (UHD) optical system, which incorporates fully multi-coated SCHOTT High Transmission (HT) glass, and extra-low dispersion (ED) lens to provide sharp, see bright...tractoptics.com
The gen 2 razors had 4 lens elements in the bell alone. 3 in the ocular. Glass is surprisingly heavy