SWFA SS 10x42 Gen 2

Precision / TacticalSFPMRAD30 mm tube

The SWFA SS 10x42 Gen 2 is a 10×42 SFP scope on a 30 mm tube with a Mil-Quad reticle and 0.1 MRAD clicks. Its exit pupil works out to an estimated 4.2 mm, and its twilight factor is 20.5. It is the cheapest of the 26 precision scopes here, at ~$350.

Approx. price: ~$350
Magnification: 10×
Objective: 42 mm
Weight: 20.8 oz

Best for

Dialed shooting at known and unknown distances — PRS-style matches and long-range steel

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Derived optics

estimated

Exit pupil: 4.2 mm
Twilight factor: 20.5 at 10×
Zoom ratio: Fixed power

Exit pupil and twilight factor are computed from the published magnification and objective diameter, not measured. Real exit pupil is also capped by the erector at low magnification, and coatings and glass quality move low-light performance in ways the formula cannot see — read these as comparisons between layouts, not verdicts on scopes.

Specifications

Manufacturer-published figures, read from swfa.com. MOA/MRAD conversions use 3.438 MOA per mil.

Magnification: 10×
Objective lens: 42 mm
Focal plane: SFP
Reticle: Mil-Quad
Illuminated: No
Turret unit: MRAD
Per click: 0.1 MRAD (0.36″ at 100 yd)
Elevation travel: 40 MRAD (≈137.5 MOA)
Windage travel: 40 MRAD
Zero stop: Yes
Turrets: Exposed
Parallax: Rear focus from 10.9 yd
Eye relief: 3.6″
Field of view: 11.8 ft at 100 yd
Tube: 30 mm
Length: 14.1″
Weight: 20.8 oz
Warranty: SWFA SS 4-LIFE Warranty

Features

SFP
MRAD
30 mm tube
Zero stop
Exposed turrets
Fixed parallax
Fixed power

For it, on paper

+ 20.8 oz with a 30 mm tube, the lightest scope in this group
+ 40 MIL of elevation and 40 MIL of windage travel, enormous for a fixed 10x
+ Rear-focus parallax adjustable down to 10 m, unusual on a fixed-power tactical scope
+ Modular Turret System with a built-in zero stop and exposed or capped turret options
+ Fixed 10x means there is no zoom erector to fail and the Mil-Quad subtensions are always true

Against it, on paper

− Fixed 10x: no low-power setting for close or fast shooting, and 10x is low for spotting impacts at long range
− 11.8 ft field of view at 100 yd
− 5 MIL per revolution, so a 20 MIL come-up takes four full turns of the turret