Low power variable optics
SIG Sauer Tango-MSR 1-8x24 Review
Quick answer
The SIG SAUER Tango-MSR 1-8x24mm LPVO Riflescope, SFP, Illuminated MSR BDC-8 Reticle is a 1-8x second focal plane LPVO on a 24 mm objective, listed at under $500 with a cantilever mount in the box. Taking a 24 mm objective to 8x drops the exit pupil to 3 mm, a real cost in eye box and low light performance for the extra reach over a 1-6x24.
The Tango-MSR 1-8x24 is the longer-reaching sibling of the SIG SAUER Tango-MSR LPVO 1-6x24 Riflescope reviewed elsewhere on this site. Both use a 24 mm objective on a 30 mm tube, so the difference between them is what happens when you ask that objective to support 8x instead of 6x, and that difference is worth stating in exact numbers rather than in adjectives.
At under $500 the listing includes lens covers and a one-piece aluminum cantilever mount, so a flat top carbine owner does not have to solve the mount separately. The honest question this review answers is whether the extra reach is worth what it costs at the top of the zoom range.
This review is researched from the manufacturer listing and published specifications, not from a hands-on shooting session, and the exit pupil comparison against the 1-6x24 is exact arithmetic rather than an estimate.
On this page
- SIG Sauer Tango-MSR 1-8x24 key specs
- What does 8x actually add over the 1-6x24 on the same objective?
- What does the 24 mm objective give you across the zoom range, and what does the extra 2x cost?
- Does the eye box also get tighter at 8x?
- What ring height and mount does this scope need?
- Where the 1-8x24 costs you: a noticeably tighter package at the top of the range
- Instead of 8x, or a step up for a wider eye box
- The 1-6x24 alternative and a longer-range competitor
SIG Sauer Tango-MSR 1-8x24 key specs
The Tango-MSR 1-8x24 is a second focal plane 1-8x24 on a 30 mm tube with an illuminated MSR BDC-8 reticle, listed at under $500.
Sourced figure
| Specification | Tango-MSR 1-8x24 |
|---|---|
| Magnification | 1-8x |
| Objective | 24 mm |
| Main tube | 30 mm |
| Focal plane | Second (SFP) |
| Reticle | MSR BDC-8, illuminated, 11 brightness levels |
| In the box | Lens covers and a one-piece aluminum cantilever mount |
| Exit pupil | 24 mm at 1x, 3.0 mm at 8x |
| Listed price | under $500 |
SIG Sauer published specifications and the current Amazon listing. Exit pupil is objective divided by magnification. Second focal plane means the BDC holds are only true at the magnification the manufacturer specifies for them, normally the top power.
What does 8x actually add over the 1-6x24 on the same objective?
The listing describes the Tango LPVO as built for close to mid-range engagements, with an integrated thread-in throw lever for quick magnification changes and an 11-level illuminated reticle. The low end of the zoom range behaves like the 1-6x24's, since the objective and the lower erector range are shared.
The difference is entirely at the top. Two extra powers of magnification on a 24 mm objective is not a free upgrade, and the arithmetic below states exactly what it costs.
What does the 24 mm objective give you across the zoom range, and what does the extra 2x cost?
Exit pupil, computed
exit pupil (mm) = objective diameter (mm) / magnification at 8x: 24 / 8 = 3.0 mm at 1x: 24 / 1 = 24 mm for comparison, the 1-6x24 gives 24 / 6 = 4.0 mm at its own maximum
Exact arithmetic. A dark-adapted human pupil rarely exceeds 5 to 7 mm depending on age, which is a population convention rather than a published spec.
This is the single most important comparison in this review: the same objective size, two different top-end powers, and a direct measurable cost.
Pushing a 24 mm objective from 6x to 8x drops the exit pupil from 4.0 mm to 3.0 mm, a 25 percent reduction for two extra powers of magnification.
Sourced figure
| Magnification | Exit pupil, 1-8x24 | Exit pupil, 1-6x24 for comparison |
|---|---|---|
| 1x | 24.0 mm | 24.0 mm |
| 2x | 12.0 mm | 12.0 mm |
| 4x | 6.0 mm | 6.0 mm |
| 6x | 4.0 mm | 4.0 mm (this scope’s maximum) |
| 8x | 3.0 mm | not available on the 1-6x24 |
At any power both scopes share, the exit pupil is the same, since both use a 24 mm objective. The entire practical difference between them lives in the top two powers.
Does the eye box also get tighter at 8x?
Eye box, the range of head position that still gives a full, unvignetted sight picture, generally tightens as magnification increases on any variable scope, and a smaller exit pupil is part of the reason why: less light is exiting the ocular lens, so a given amount of head misalignment loses proportionally more of the image at 8x than at 6x. That follows from the exit pupil arithmetic above rather than from a separate manufacturing difference.
This matters most at speed. A shooter transitioning quickly between targets at 8x needs a more consistent cheek weld than the same transition at 6x, which is the practical cost of the extra magnification beyond the raw brightness numbers.
What ring height and mount does this scope need?
The listing includes a one-piece aluminum cantilever mount, which is the usual answer for a flat top receiver. If you swap to your own mount, the optical requirements match the 1-6x24: check what ring height a 24 mm objective needs on a 30 mm tube before ordering, and use the integrated throw lever, which matters more on this scope than on a hunting optic because the magnification range you are actually using spans a full eight-to-one ratio.
Where the 1-8x24 costs you: a noticeably tighter package at the top of the range
The honest weakness of this scope is precisely the extra two power its name promises. At 8x, the 3.0 mm exit pupil and the tighter eye box that comes with it make this a meaningfully less forgiving optic at maximum magnification than a 1-6x24 at its own maximum, and a shooter who bought the 1-8x24 expecting no compromise except more reach will notice the difference specifically in dim light and at speed.
The BDC reticle also deserves the caveat given to any second focal plane reticle: the hold marks are calibrated for one specific magnification, and reading them at any other power gives an incorrect holdover distance. Check SIG Sauer's reticle chart for the magnification and distances the MSR BDC-8 marks are drawn for, a limitation shared with the 1-6x24 and with every second focal plane reticle in this catalog.
Instead of 8x, or a step up for a wider eye box
The most direct comparison is the 1-6x24 from the same Tango-MSR line, plus a longer-range alternative that reaches further without the same top-end trade.
| Model | Budget | Magnification | Objective lens | Focal plane | Tube diameter | Illuminated reticle |
|---|---|---|---|---|---|---|
| | Under $500 | 1-8x | 24 mm | Second | 30 mm | Yes |
| | Under $500 | 1-6x | 24 mm | Second | - | - |
| | Under $500 | 1-10x | 24 mm | Second | 30 mm | Yes |
A dash means the manufacturer does not publish that figure. We leave it blank rather than estimating it.
The 1-6x24 alternative and a longer-range competitor
If the tighter eye box and narrower exit pupil at 8x are not worth the extra reach for your carbine, the SIG SAUER Tango-MSR LPVO 1-6x24 Riflescope on a 24 mm objective gives up two powers of magnification for a brighter, more forgiving top end. For a shooter who wants to go further than 8x rather than stop short of it, the Swampfox Arrowhead 1-10x24 SFP LPVO, Green BDC, 30mm pushes a 10x erector ratio on a 30 mm tube, at the cost of an even tighter eye box at its own maximum.
How we chose
We did not test these optics in person and we never claim to. Picks are researched from manufacturer specification sheets, published optical and ballistic formulas, and the recurring themes in verified owner reviews. Every pick is matched to a real objective diameter, a real tube size, a real ring height or a real exit pupil rather than to a price bracket, and it is placed in the tier where its capability actually belongs. Where a figure is shooter convention rather than a sourced number we label it, and where a manufacturer does not publish a figure we leave it out instead of estimating it.
Sources
- SIG Sauer published specifications and the Amazon listing for the Tango-MSR 1-8x24 and Tango-MSR 1-6x24
Frequently asked questions
Is the SIG Sauer Tango-MSR 1-8x24 first or second focal plane?
The listing reviewed and linked here is second focal plane (SFP), so the reticle stays the same size as you zoom and the BDC holds are calibrated at one specific magnification. Check the listing title for FFP or SFP before you order any 1-8x, because the two use their hold marks differently.
What is the difference between the Tango-MSR 1-6x24 and the 1-8x24?
Both use a 24 mm objective, so at any power they share the exit pupil is the same. Above 6x, the 1-8x24 pushes two extra powers of magnification from that objective, which drops the exit pupil at maximum power from 4.0 mm on the 1-6x24 to 3.0 mm here, a real cost in brightness and eye box.
What exit pupil does the Tango-MSR 1-8x24 give at full magnification?
3.0 mm at 8x, computed exactly as the 24 mm objective divided by 8x magnification. That is noticeably narrower than the 4.0 mm the 1-6x24 gives at its own maximum, and it is the direct arithmetic cost of the extra reach this scope offers.
Is the eye box tighter on the 1-8x24 than the 1-6x24?
Generally yes, consistent with the exit pupil arithmetic: a smaller exit pupil means less tolerance for head position error at maximum power. Below 6x the objective is the same size on both scopes, so the difference lives in the top two powers.
Is the Tango-MSR 1-8x24 good for a general purpose carbine?
Yes, if the rifle needs to both engage close and identify or shoot at extended distance, since 8x offers real reach the 1-6x24 does not. If the rifle is shot fast and close almost exclusively, the 1-6x24 gives a brighter, more forgiving top end for less money.
Do the BDC holdover marks work at every magnification?
No. This is a second focal plane reticle, so the marks are only correct at the magnification SIG Sauer calibrates them for, typically maximum power. Using the marks at a lower magnification gives an incorrect holdover distance.
What ring height does a 24 mm objective need on a 30 mm tube?
A modest height, since 24 mm is a small objective. The listing ships with a cantilever mount, so most owners will not need to choose rings at all; if you use your own, most standard ring heights clear a 24 mm objective without difficulty.
Researched, not professional advice. This page is compiled from published manufacturer specifications, published optical and ballistic formulas, and owner-review consensus, not hands-on testing. Figures described as a rule of thumb are shooter convention rather than sourced numbers, and they are labelled that way wherever they appear. Ballistic figures come from a point mass model using the ballistic coefficient the maker publishes, so treat them as a starting point and confirm them on paper at a measured distance. Confirm your firearm is unloaded with the action open before you mount, level, torque or bore sight anything. Verify a zero only on a supervised range or a safe, legal backstop, know what lies beyond your target, and follow the law where you hunt and shoot, including rules on land access and permitted cartridges.
