• Reduced AP usage for most scopes
• Variable magnification/function scopes now "actuated" via Scope Modes feature vs Item Transformation feature
• specific "Iron Sights" no longer implemented via on-weapon Percent Cap bonus, now long arms for the most part have a 10% Percent Cap bonus (this you might remember was one of the original NCTH aides my mods implemented, and is also the same bonus used by larger/longer barrel pistols to portray benefits of a longer sight radius)
• Scopes with magnification below 3x no longer remove the 10% Percent Cap bonus

• Most Long Arms, <PercentCap> = 10, was variable depending on broad "guestimate" of quality of the iron sight (or was already just 10 for weapons where an "iron sight" bonus was never accounted for under the last NCTH implementation)
  - - most shotguns now benefit from this as well
• All Scopes:
  - - <PercentAPReduction> = 0, was variable depending on the scope's power, affects both NCTH and OCTH
• Scopes with Magnification below 3x
  - - <PercentCap> = 0, was a variable penalty meant to zero out
• Scopes with Magnification of 3x and higher
  - - <PercentCap> = -10, simply zeros out the long arm bonus
  - - <PercentHandling> (Standing) = 2x <ScopeMagFactor>, was variable with "class" of magnification as opposed to directly linked
  - - <PercentHandling> (Crouching) = <ScopeMagFactor> rounded to nearest integer, was carried over from Standing for the most part
  - - <PercentHandling> (Prone) = 0, was carried over from Standing for the most part
• 504. Tactical Iron Sights, <AttachmentClass> = Iron Sights, was Iron Sight
• 512. 5.5x Reflex Scope:
  - - <PercentReadyTimeAPReduction> = 0, was -10
  - - <PercentAPReduction> = 0, was -10
• 522. Thermal Imaging(FLIR) - Weapon Sight, implemented new (2015) variable mode scope
  - - <nasLayoutClass> = 2048, was 0
  - - <AvailableAttachmentPoint> = Integral - Optics
  - - <DefaultAttachment> = Lenses: 2x, 3x, 4x, 5x
  - - <ProjectionFactor> = 0, was 1.5
• 524. PO 3.5x21P:
  - - <PercentAPReduction> = 0, was -10
  - - <PercentCap> = 0, was -11
• 533. DM Sight, 4x, item removed
• 534. Dual Mode Sight:
  - - names, descriptions, and inventories modified to reflect that this item no longer has a variation
  - - <nasLayoutClass> = 2048, was 0
  - - <AvailableAttachmentPoint> = Integral - Optics
  - - <DefaultAttachment> = Lenses: 4x
  - - <HiddenAddon> = 0, was 1
  - - <NotBuyable> = 0, was 1
  - - <HiddenAttachment> = 0, was 1
  - - <BlockIronSight> = 0, was 1
• 535. Variable Power Scope:
  - - names, descriptions, and inventories modified to reflect that this item no longer has a variation
  - - <nasLayoutClass> = 2048, was 0
  - - <AvailableAttachmentPoint> = Integral - Optics
  - - <DefaultAttachment> = Lenses: 3x, 4x, 5x, 6x, 7x, 8x
  - - <HiddenAddon> = 0, was 1
  - - <NotBuyable> = 0, was 1
  - - <HiddenAttachment> = 0, was 1
  - - remaining stats appropriate to a 9x Scope
• 536. Variable Power RIS Scope
  - - was <uiIndex> = 586, "Variable Power RIS Scope, 9x"
  - - names, descriptions, and inventories modified to reflect that this item no longer has a variation
  - - remaining stats similar to Variable Power Scope
• 537. Variable Power RIS Scope/Reflex Mount
  - - was <uiIndex> = 589, "Variable Power RIS Scope/Reflex Mount, 9x"
  - - names, descriptions, and inventories modified to reflect that this item no longer has a variation
  - - remaining stats similar to Variable Power Scope
• 538. 1P21 Minuta Sniper Scope
  - - was <uiIndex> = 540, "1P21 Minuta Sniper Scope, 9x"
  - - names, descriptions, and inventories modified to reflect that this item no longer has a variation
  - - remaining stats similar to Variable Power Scope
• 539. PO-1.5-4.5x16
  - - was <uiIndex> = 540, "1P21 Minuta Sniper Scope, 9x"
  - - names, descriptions, and inventories modified to reflect that this item no longer has a variation
  - - <nasLayoutClass> = 2048, was 0
  - - <AvailableAttachmentPoint> = Integral - Optics
  - - <DefaultAttachment> = Lenses: 1.5, 2x, 3x, 4x
  - - remaining stats appropriate to a 4.5x Scope
• 540. no longer has an item
• 581 - 589. Lens items
• 591. TactiKool-Aid AR-15 RIS Scope Mount, <PercentCap> = 0, was -7 (no longer need to account for AR-15 "iron" sight)
• 593. TactiKool-Aid FAL Optics RIS, <PercentCap> = 0, was -5 (no longer need to account for FAL "iron" sight)
• 594. TactiKool-Aid H&K Optics RIS, <PercentCap> = 0, was -6 (no longer need to account for Heckler&Koch diopter "iron" sight)
• 595. TactiKool-Aid RSA/SVU RIS Scope Mount, <PercentCap> = 0, was -1 (no longer need to account for AK "iron" sight)
• 601. TactiKool-Aid Galil Tri-Rail, <PercentCap> = 0, was -3 (no longer need to account for Galil "iron" sight)
• 626-628. no longer have items
• 676. Heavy Bipod, <AimLevels> (Prone) = -1, was 0
• 678. Integral Battle Scope/Sight Combo:
  - - <nasLayoutClass> = 2048, was 0
  - - <AvailableAttachmentPoint> = Integral - Optics
  - - <DefaultAttachment> = Lenses: 3.5x G36 Scope
  - - <ScopeMagFactor> = 1.0, was 3.5
  - - <PercentBase> = 0, was 10
  - - <PercentTargetTrackingSpeed> = 0, was 5
  - - <PercentCounterForceAccuracy> = 0, was -35
• 681. OICW Fire Control Module:
  - - <nasLayoutClass> = 2048, was 0
  - - <AvailableAttachmentPoint> = Integral - Optics
  - - <DefaultAttachment> = Lenses: 2x, 3x
• 682. FN F2000 Fire Control Module:
  - - <nasLayoutClass> = 2048, was 0
  - - <AvailableAttachmentPoint> = Integral - Optics
  - - <DefaultAttachment> = Lenses: 2x, 3x
  - - <PercentAPReduction> = 0, was -10
  - - remaining stats appropriate to a 3.5x Scope
• 685. ARX-160 Sight:
  - - <nasLayoutClass> = 2048, was 0
  - - <AvailableAttachmentPoint> = Integral - Optics
  - - <DefaultAttachment> = Lenses: 2x, 3x
  - - <PercentAPReduction> = 0, was -10
  - - remaining stats appropriate to a 4.0x Scope
• 688. Integral Thermal Weapon Sight, <PercentCounterForceAccuracy> = -45, was 0

Sadly, I'd say that guns overall need a complete overhaul.
Don't have the time to scavenge for many examples right now but from what I remember from my last playthrough, you'd need to use almost all of your AP to ready and fire a long, tricked out AR-15... only to have it miss.
Autofire's all over the place. A few machine pistols with unfolded stocks (I'm thinking 9x18 right now) handle okay with short to medium bursts while others just shoot straight for the sky after 2 or 3 bullets. These things are supposed to be easy to control. Low damage output and accuracy but easy to control.

There's basically just a lot of problems which only serve to piss the player off. That is, until you find the one gun that somehow manages to work right. I've managed to mitigate some of this with some major NCTH tweaking. Still a lot of the same problems though. Can't fathom how anyone would be able to play with the standard settings.

Prone, with bipod, Russian scope, a lot of AP spent on aiming, target unobstructed, optimal scope/weapon range... and the shot just goes haywire. Full meters off target. That's what I remember from the standard setup.

Two fully aimed shots per turn?

"Also I forgot to mention that for "normal" size sniper rifles I've lowered the number of (NCTH) aim levels to four: faster to reach max aim. Heavier AMR type rifles should be down to four when prone."