I have some experience with the M-14 platform, and I can attest that it is terribly hard on “budget” friendly scopes as well as some higher end (read expensive ish) target scopes....
Tasco- granted I tried this on a dare.... but it was one of those rimfire “target” style scopes, a 2.5-10x44 Varmit model iirc. It didn’t make 20 rounds and the adjustable paralux didn’t. Tasco’s warranty replaced the scope. Pronghorn 3-9; lasted about 200 rounds, adjustable zoom would spin but wouldn’t “adjust”. Replaced under warranty.
Vortex- I’ve tried a sparc; didn’t make it 20 rounds and it turned off and wouldn’t turn back on (even with fresh batteries), Diamondback; the crosshairs started to rotate clockwise at 40 rounds, Viper PST ($1300 scope) under 80 rounds and the reticle started spin counter-clockwise. Granted these were covered by warranty, and all netted NIB replacements, but still....
Redfield (made by Leupold)- currently my “go to” testing scope. It’s a Revolution 4-12x40 accu-range hunting optic. It’s seen over 1000 rounds on 30+ different rifles (Basset Machine mount) and it’s still going strong.
Bushnell- 3-9x40 (Walmart special, under $250) didn’t make it 100 rounds. Just enough to get it zero’d then the zero started to wander. Replaced under warranty. 4x40; (straight power) I put on a rifle for my father, 5yrs later (unknown round count) still going strong, Elite Tactical 4-12x44; currently resides on my LRB M25, (round count over 500) still going strong, Elite tactical 6-24x50; it’s moved around on a couple different rifles, I use it to test rifle placed in Chassis, (round count between 400-500) still going strong.
My personal recommendation....Redfield or Leupold for standard hunting style scopes. If you want something that you can spin the knobs with (to get out further than 400y) then it’s hard to beat the Elite Tactical line.
M14 pattern rifles beating up scopes is a real thing and not just internet hype.
John