Requires CET 1.8.4 

So, scopes. I've gone into detail on this reddit post but as a summary:
Range and ADS on scopes don't tell the whole story. Range affects where damage dropoff starts, but not the magnification of the scope.
Range is also affected more by quality than the number you see (for example at purple quality, scopes get +15 range on top of the listed stat).

This mod only affects zoom, or magnification. It doesn't affect damage distance (the range stat).

Ok, so this requires a little configuration. You'll need notepad or similar. 

Unzip to the mods folder in CET. If you don't know what that means, read the CET wiki.
Once you have the lua file installed, open it with your text editor of choice.
Look for the following lines near the top.

local mods = {
{ "Items.w_att_scope_short_01","Gimlet", 0, 0.2 },
--{ "Items.w_att_scope_short_02", "Hyakume",0, 0.5 },
--{ "Items.w_att_scope_short_03", "Add-Vantage",0, 0.2 },
--{ "Items.w_att_scope_short_04", "Kanone Mini",0, 0.4 },
--{ "Items.w_att_scope_short_05", "2067",0, 0.4 },
--{ "Items.w_att_scope_long_01", "Grandstand",0, 0.5 },
--{ "Items.w_att_scope_long_02", "Percipient",0, 1.1 },
--{ "Items.w_att_scope_long_03", "Clearvue",0, 0.9 },
--{ "Items.w_att_scope_long_04", "SO 21",0, 0.9 },
--{ "Items.w_att_scope_sniper_01","Kanone Max",0, 3.0 },
--{ "Items.w_att_scope_sniper_02","Prospecta",0, 3.0 },
}
Remove the -- (double-hyphen) from the scope type you want to change, and add it back in front of the Gimlet.
The number at the end is the default zoom, in case you want to switch back. Don't edit it. That won't do anything. It's just there as a reminder.

To change the zoom level, look for this line.
local newZoom = 0.5 -- For guidance, sniper default zoom is 3.0. Gimlet is 0.2

And change it to the zoom level you want. 1.0 will zoom in 1x. 3.0 will zoom in 3x. (snipers default to 3.0, gimlet defaults to 0.2. Start with 0.5 and see what you think. The images on the mod show a x15.

Then run something like 
dofile("scope.lua")
or
dofile("bin/x64/plugins/cyber_engine_tweaks/mods/scope.lua")

You should see something like
Set Gimlet zoom to 0.5
Updated 1 Gimlet