In this red dot vs scope comparison. Let's do a side by side comparison on which optic option is best for your carbine applications in the context of range use at 25, 50, and 100 yards.
At the end, we will touch a little bit on our best recommendations for home defense, Competition shooting and long range marksmanship.
Red Dot Sight
In close quarter combat situations, red dot sights are quicker to use due to their unlimited eye relief and ability to quickly acquire targets.
They are also lightweight and small, making them ideal for use on pistol caliber carbines and centerfire carbines.
Additionally, they can be used as an offset sight on DMR rifles. When it comes to close range shooting, red dot sights offer more benefits than magnified scopes.
At 25 yard
Shooters can keep both eyes open and focus on the target plane to aim, while the non aiming eye can keep the peripheral vision wide open. A 25 yard target is fairly easy to aim with a red dot sight without magnification.
Simply, just point and shoot (Assuming it's zeroed). A red dot sight is very easy to use during the day and night (with a good rifle light to lit up the target)
At 50 yards
Depend on the size of your targets down range, a red dot sight is still viable at 50 yards or even 70 yards as long as the user can still see the target while aiming.
This is the part where the user has pick the right reticle brightness setting or the reticle size. Sometimes the glare on the glass or reticle smear combined with astigmatism that can obscure the target down range.
Dot sizes matter for a red dot sight for long distance shots. 1 MOA is the smallest option available.
Depending on the ballistics performance, the shooter can still expect center mass hit without significant holdover.
If the reticle is larger than 2 MOA, it can obscure a small target as well. This can be an issue when zeroing a red dot at 50 yards.
At 100 yards
A red dot sight can still hit a target at 100 yards to get a 2 MOA accuracy, but it will be much hard to see especially the target background is busy. It's even harder in low light conditions or aiming facing direct sunlight.
When trying to aim at a target 100 yards away, it can be difficult to see (especially with astigmatism) and accurately hit the mark without some sort of magnification. This is where a red dot magnifier comes in handy.
By mounting a magnifier scope behind your red dot sight, you can zoom in on the target and get a clearer view of what you're aiming at. This can greatly improve your accuracy and make it easier to hit your target.
Overall, a red dot magnifier is a useful tool to have in your arsenal when trying to take down long range targets
The shooter can expect much better target sight picture, and also notice slightly more reticle tremor and dot placement error on 3X or 6X than at 1X.
Rifle Scope At 50+ Yards
Riflescopes are great for shooting past 50+ yards. A riflescope inherently provides much better target identification and finer aim at longer distances than a red dot sight.
Currently, low power variable optic is the best hybrid riflescope that can perform CQB at 1X and long range shooting at 6X, 8X or 10X.
The Most popular option is the 1-6X LPVO for competition shooting, and paired with an offset red dot for faster sight transitions.
Long Range Shooting
For engaging targets past 100+ yards, red dot sight is no longer a viable option. This is where a riflescope is needed for much more accurate shot.
For precision shooting, we recommend 1st focal plane scope that features a Christmas tree reticle like the Horus H59 with an open center aim point (Open center crosshair doesn't obscure the target).
These type of reticle can help the shooter estimate target range, windage and elevation holdover.