Guides
All 80 articles from Gun Optics, newest first. Search, filter by topic, or sort to find the one you need.
How to Box Test a Scope's Tracking at the Range
Step-by-step scope box test: dial up, right, down and left, then read the target to see if turrets track true and return to zero. MOA and mil math included.
How to Box Test a Scope's Tracking at the Range
Step-by-step scope box test: dial up, right, down and left, then read the target to see if turrets track true and return to zero. MOA and mil math included.
Red Dot Brightness: How to Pick the Right Setting
How bright should your red dot be? A simple method for daylight, dusk, indoor and night vision settings, plus how auto-brightness and motion-on modes behave.
QD vs Fixed Scope Mounts: Does Quick-Detach Hold Zero?
Do quick-detach scope mounts hold zero? How QD levers and fixed clamps differ, what return-to-zero claims mean, and how to check your own mount at the range.
Prism Scope vs Red Dot: Pluses and Minuses Beyond Astigmatism
Prism scope vs red dot: how etched reticles, fixed 1x to 5x power, eye relief and battery-free aiming compare, and which one suits your rifle and your eyes.
Leupold Started With Surveying Gear: The 1907 Origin Story
How a 1907 Portland surveying-instrument repair shop became Leupold & Stevens: water level recorders, a fogged scope, the 1947 Plainsman and the Duplex reticle.
How to Boresight a Rifle Scope Before Your First Shot
How to boresight a rifle scope before your first shot: visual vs laser methods, step-by-step setup, safety rules and what to expect from your first live groups.
How Far Can You Shoot With a Red Dot?
How far can you shoot with a red dot? Realistic ranges for pistols, carbines and magnified setups, with an MOA table showing how much target your dot covers.
Do Scopes Really Glint? The Movie Myth vs Reality
Do rifle scopes really glint like in the movies? The physics of lens reflection, when it happens on a hunt, and how caps, sunshades and killFLASH filters help.
Best Red Dots for Turkey Hunting Shotguns
Best red dots for turkey hunting shotguns: Holosun HS515GM, HE510C-GR, 507C X2 and the Trijicon RMR, plus dot size, mounting and how to pattern with your load.
Best Riser Mounts for AR Red Dots
Best riser mounts for AR-15 red dots: tall 2.26-inch FAST mounts, absolute risers, lower 1/3 factory mounts and magnifier heights, and who should skip each.
Best EOTech Alternatives for Less Money
EOTech alternatives compared: Vortex UH-1, Holosun 510C, Sig Romeo8T and the EOTech 512, with what you gain and give up versus a true holographic sight.
Best Deer Hunting Scopes for Mid-Budget Rifles
Mid-budget deer scopes from Sig, Burris and Steiner compared on listed specs: magnification, objective, illumination and field of view, plus who each one fits.
ACOG vs LPVO: Is the ACOG Obsolete in 2026?
ACOG vs LPVO in 2026: how a fixed 4x tritium prism compares with a 1-6x or 1-10x variable for speed, battery-free use, weight and eye relief, and which to buy.
3x vs 5x Magnifier: Which Belongs Behind Your Red Dot?
3x or 5x red dot magnifier? Field of view, eye relief, exit pupil and weight compared from EOTech and Sig specs, plus which power suits which rifle.
1-6x vs 1-8x vs 1-10x LPVO: How Much Zoom Do You Need?
1-6x, 1-8x or 1-10x LPVO? How each zoom range changes eye relief, exit pupil, tube size, weight and mounts, with listed specs from Sig, EOTech and Riton.
First vs Second Focal Plane Scopes: Which Should You Buy?
FFP vs SFP explained by use: hunting, long-range practice and LPVOs. How each reticle behaves when you zoom, the holdover math, and who should pick which.
EOTech's Hologram Came From a Michigan Research Lab
How a nonprofit Ann Arbor research institute turned holography into a rifle sight: ERIM, the 1996 Bushnell HoloSight, L-3, the 2015 lawsuit and EOTech today.
Best LPVO Mounts: Cantilever, QD and One-Piece Picks
The best LPVO mounts for 30mm and 34mm scopes on an AR: Geissele, Warne, Sightmark, Burris and Sig, with how to choose height, offset, QD vs fixed and torque.
Aimpoint vs EOTech: Which Duty Rifle Optic Is Better?
Aimpoint CompM5s vs EOTech EXPS3 on battery life, power source, window, reticle, night vision settings and weight, with a clear pick for each kind of shooter.
What Does 3-9x40 Mean on a Scope? Numbers Decoded
3-9x40 decoded: magnification range, objective size, exit pupil math, field of view and tube size, plus how to read other scope names like 1-6x24 and 4-16x44.
Vortex Strike Eagle vs Primary Arms SLx 1-6x: Budget LPVO Duel
Strike Eagle 1-6x24 vs Primary Arms SLx 1-6x24 Gen IV compared on reticle, eye relief, field of view, turrets, illumination, weight and warranty for an AR-15.
How to Adjust the Diopter on a Rifle Scope
Set your scope's eyepiece focus so the reticle is sharp for your eye: the blank-sky method, quick-glance timing, glasses tips, and how it differs from parallax.
Trijicon RMR vs Aimpoint Acro P-2: Open vs Enclosed Duty Dot
RMR Type 2 vs Acro P-2 compared on emitter design, battery life, weight, size, brightness, waterproofing and footprint, with a pick for carry, duty and range use.
Best Red Dot Magnifiers for AR-15s
The best red dot magnifiers for an AR-15, from EOTech's G43 and G45 to Holosun, Sig Sauer, Trijicon and Sightmark, with how to pick 3x vs 5x, mounts and height.
Aimpoint's Swedish Origin: The Company That Built the Red Dot
How a Malmö technician, a shaving mirror and a toilet-roll prototype led to the Aimpoint Electronic in 1975, the first commercial red dot, and the M68 CCO.
Weapon Lights for Home Defense Long Guns
How to choose and mount a weapon light on a rifle or shotgun: rail placement, switches, remote options, brightness indoors and why the TLR-1 HP is a common fit.
Streamlight TLR-1 HP vs TLR-8A: Throw or Light-Laser?
Streamlight's TLR-1 HP and TLR-8A compared on candela, lumens, beam distance, size, laser and holster fit, with a decision table for pistols and long guns.
Sig Tango-MSR 3-18x50 Review
What Sig's manual and retailer listing say about the Tango-MSR 3-18x50 FFP scope, plus a plain method for checking tracking and zero stop yourself.
Sig Tango-MSR 1-10x28 Review
A spec-and-manual review of the Sig Tango-MSR 1-10x28 LPVO: second focal plane BDC reticle, exit pupil math at 10x, eye relief and what to check before mounting.
SureFire XC2 vs Streamlight TLR-6: Compact Light-Lasers
SureFire's XC2-B and Streamlight's TLR-6 compared on mounting, output, laser, batteries and water rating, plus a note on the XC2's current availability.
Streamlight TLR-6 Review: The Subcompact Light
Streamlight's TLR-6 light and red laser for subcompact pistols: 100 lumens, 2,000 candela, CR1/3N cells, laser zero retention and the fit questions to settle first.
Streamlight ProTac HL Review: A Handheld for the Nightstand
Streamlight's ProTac HL handheld light: 750 lumens, 18,300 candela, ten-tap programming, two CR123A cells, and why a handheld still matters beside a weapon light.
Sig Romeo5 Gen II Review
A manual-based review of the Sig Romeo5 Gen II: variants and mount heights, MOTAC timing, torque values, a recall notice to check, and who it suits.
Riton 3 Tactix MPRD Review
Riton's 3 Tactix MPRD is a small, light micro red dot, but listings show different versions. Here is what is documented, what is not, and how to vet one.
Parallax and Why Your Dot Moves
Parallax in plain words: why a scope reticle shifts when your eye moves, what 'parallax-free' means on a red dot, and how to check and reduce the error.
Optics for Shooters Who Wear Glasses
How glasses change eye relief, diopter setting and red dot clarity, with documented eye relief figures for common optics and a fit checklist for wearers.
Optic Mounting Torque: The Numbers That Matter
Published inch-pound values from Holosun, Sig, EOTech, Vortex and others, why they differ, and how thread locker, torque tools and rechecks fit in.
Battery Life Claims: How to Read Them
What '50,000 hours' on a red dot spec sheet actually assumes: brightness setting, reticle mode, temperature, cell capacity, shake-awake timers and solar backup.
Holosun EPS Review: Enclosed Emitter for Carry
A spec-based look at Holosun's EPS enclosed pistol sights: K-footprint plates, CR1620 side trays, what an enclosed emitter does and does not protect.
Holosun 507C X2 Review: The Default Pistol Dot
A spec-driven look at the Holosun HS507C X2: circle-dot reticle options, Solar Failsafe, side battery tray, RMR footprint and who should pick it.
Holosun 407C X2 Review: The Dot-Only Option
What the Holosun HS407C X2 shares with the 507C X2, what it drops, and which shooters can skip the multi-reticle option and keep the simpler dot.
EOTech G43 Magnifier Review
EOTech's G-series manual puts the G43 at 3x, 2.5 in eye relief and 11.3 oz. Here is what the numbers mean for weight, the STS flip mount, and fit.
EGW Mounts for Vortex Viper/Venom: Footprint Fixes
How EGW's Vortex Viper/Venom mounts work, the Docter-pattern footprint behind them, dovetail versus plate mounting, and a checklist for Springfield XD/XDM owners.
Best Budget Red Dots: Romeo5, Riton and Holosun 407C
Three value-oriented red dots sorted by job: the Sig Romeo5 Gen II for rifles, the Holosun 407C X2 for pistols and the Riton MPRD for a low-commitment pistol trial.
Best LPVOs for the Money: What to Weigh Before You Buy
A value-focused way to choose a 1-8x or 1-10x LPVO, with the Sig Tango-MSR 1-10x28 as the anchor pick and a checklist of specs that decide real-world fit.
Range Safety Glasses Markings: What the Label Can and Cannot Tell You
Learn how to interpret protective-eyewear claims, check fit and spot misleading descriptions before relying on range eye protection.
Winter Optics Prep: The Small Stuff That Saves a Cold Range Day
A clean lens, working hearing protection and a dry case are boring until they are not.
Thanksgiving Range Day: The Case for Keeping the Optics Talk Friendly
Nobody needs a holiday argument about first focal plane before the pie is served.
Spooktober Optics Myths: 10 Things the Internet Keeps Resurrecting
This site spends a lot of time talking about what happens between the target and the retina. Protective eyewear belongs in that conversation because it literally occupies that space. Some…
Shooting Glasses and Scope Eye Relief: The Fit Problem Nobody Tests in the Store
Protective eyewear is part of the optical system because your face is part of the optical system.
The Fall Optics-Bag Audit: Batteries, Lenses, Caps, Cloths and the Stuff You Forgot
October is a better time to discover a dead battery than the first cold morning you actually need it.
October’s Low Sun Can Wreck an Otherwise Perfect Sight Picture
Golden hour is beautiful in photographs and occasionally awful through glass.
Holiday Travel With Expensive Optics: Think About Storage Before the Trunk Is Full
Cars, luggage, guests and rushed packing are not a good security plan.
Hearing Protection, Cheek Weld and Why Comfort Changes Your Sight Picture
A bulky or badly adjusted setup can turn a repeatable position into a wrestling match.
Gifts for the Optics Nerd When You Have No Idea What Scope They Own
Do not guess ring diameter. Do not guess footprint. Buy the universal useful stuff.
Fogged Safety Glasses vs a Perfect Optic: Guess Which One Wins
The $1,500 optic does not matter if the $15 protective lens in front of your eye is opaque.
How to Ask Your Dad About His Optics Without Making the Gift Obvious
Ask what annoys him, not what SKU he wants. Complaints are a gift guide.
Clear vs Smoke Safety Lenses in Fall: Match the Light, Keep the Protection
This site spends a lot of time talking about what happens between the target and the retina. Protective eyewear belongs in that conversation because it literally occupies that space. Autumn…
Sig TANGO-MSR 3-18x50: What a Budget Precision Scope Gets You
Is the Sig TANGO-MSR 3-18x50 enough scope for a first precision rifle? What to check, what budget scopes give up, and when to step up.
Sig TANGO-MSR 1-10x28: What a 1-10 LPVO Gets You
The Sig TANGO-MSR 1-10x28 LPVO explained: 34mm tube, illuminated BDC reticle, throw lever and included mount, plus who a 1-10 fits.
Sig Romeo5 Gen II: Who It's For, and Who Should Spend More
The Sig Romeo5 is the default budget rifle dot. Here's who it fits, where budget dots draw the line, and when a step up is worth it.
Riton 3 Tactix MPRD: Is a Budget Pistol Dot Worth It?
The Riton 3 Tactix MPRD is a lightweight budget pistol dot. Where budget dots make sense, where they don't, and what to check before mounting one.
Putting a Red Dot on a Shotgun: Mounting, Zeroing and Patterning
How to put a red dot on a home-defense or field shotgun: rail and receiver options, which dots work, zeroing for slugs and buckshot, and patterning.
Pistol Red Dot Reticle Size: 2 vs 6 MOA, and When the Circle Helps
How pistol red dot reticle size affects speed and precision: small dots, large dots, the 32 MOA circle, and how to pick for carry, range and competition.
Holosun 507C X2 vs 407C X2 vs EPS: Which Pistol Dot Should You Buy?
Holosun's three most common pistol dots compared: single dot vs multi-reticle vs enclosed emitter, footprints, batteries, and who each one fits.
EOTech G43 Magnifier: How to Set Up a Dot and Magnifier Rifle
Setting up the EOTech G43 3x magnifier behind a holographic or red dot: mount height, spacing, eye relief, and when this beats an LPVO.
Solar Failover, Shake-Awake, and 100k-Hour Batteries: Optic Power Tech Decoded
What optic battery claims really mean: how 100k-hour ratings are measured, what solar failover and shake-awake actually do, and how to build a power routine you can trust.
RMR, ACRO, T1/T2, RMSc: Red Dot Footprints and Mounts Finally Explained
Red dot footprints decide what optics fit your slide or rifle. RMR, ACRO, RMSc, T1/T2, and DPP patterns explained, plus plates, direct milling, and how to avoid mounting mistakes.
Osight-R vs Holosun AEMS vs EOTech: The New Enclosed Rifle Dot Battleground
The Osight-R launches September 19, 2026 into a fight with Holosun's AEMS and EOTech's holographic sights. Full comparison: battery, window, reticles, durability, and value.
LPVO vs Red Dot + Magnifier: The One-Optic Question Settled by Use Case
LPVO or red dot with a flip-to-side magnifier? We settle the eternal AR optic debate by use case: speed, distance, weight, budget, and the honest trade-offs of each setup.
Hunting Season Scope Setup: Second Focal Plane, Illumination, and BDC Basics
Set up a hunting scope the practical way: why second focal plane still rules hunting, when illumination earns its cost, how BDC reticles really work, and pre-season checks.
Enclosed-Emitter Red Dots: Why 2026 Is the Year Open Emitters Lost the Duty Market
Enclosed-emitter red dots took over the duty and hard-use market in 2026. Here's why the shift happened, what it costs you, and which enclosed dots actually earn the premium.
Absolute vs Lower 1/3 Cowitness: Red Dot Mount Heights Finally Explained
Absolute cowitness, lower-third, and tall mounts explained: what the heights mean, how they interact with backup irons and your stance, and which to choose for your rifle.
Colt's First Red Dots: How the MRS-1 and CSQ-1 Stack Against Established Players
Colt entered the red-dot market in June 2026 with the MRS-1, CSQ-1, and C3X-1. What the lineup is, who actually builds it, and whether the Pony premium is worth paying.
Thermal Optics Under Pressure: How Competition Made 2026 the Year to Buy
Thermal optic prices have fallen hard as competition intensified. What changed, what specs actually matter at each tier, and how to buy thermal in 2026 without overspending.
Astigmatism and Red Dots: Why Your Dot Looks Like a Starburst and What Fixes It
If your red dot looks like a starburst, smear, or cluster, astigmatism is usually why. What's happening optically, quick self-tests, and every fix that actually works.
Rifle Scopes and LPVOs: The Complete Guide
LPVO vs traditional scope, magnification ranges, first vs second focal plane, reticles, eye box, turrets and parallax — the specs that decide whether a magnified optic actually helps you…
Red Dot Sights: The Complete Buyer's Guide
How red dots work, open vs enclosed emitters, dot size in MOA, footprints, co-witness, and the astigmatism and battery facts most buyers learn too late. Everything before you buy a red dot.
How to Choose a Gun Optic
Red dot, LPVO, magnified scope or prism? A plain-English framework for matching an optic to your platform, the specs that actually matter, and the mistakes that cost people a re-zero.
Mounting and Zeroing Any Optic: The Complete Guide
Mounting is 80% of getting an optic to perform. Ring height, leveling, torque, boresighting, the diopter fix, height over bore, and the full zeroing process — with the on-site click…