Description
The Trijicon ACOG 100390 is a 4x x 32mm rimfire scope from Trijicon with a Illuminated Green LED Crosshair .223 / 5.56 BDC reticle.
Trijicon ACOG 100390 Overview
A rimfire scope is built around the short ranges and light recoil of 22 LR and 17 HMR rifles, usually with the parallax set closer than a centerfire scope so targets at 50 to 100 yards stay crisp.
A rimfire scope is not built for heavy centerfire recoil, so keep it on the rimfire, airgun or light rifle it was designed for.
Optics and Reticle
Magnification runs 4x with a 32mm objective lens. The distributor lists a field of view of 36.80 ft @ 100 yds. The reticle is listed as Illuminated Green LED Crosshair .223 / 5.56 BDC. Lens coating: Multi-Coated.
In a second focal plane scope the reticle stays the same size as you zoom, which keeps it easy to see at low power. Holdover or ranging marks are only exact at the magnification the maker specifies, usually the highest setting.
Turrets and Adjustments
Adjustments move 2 Clicks per Inch @ 100 yds per click. Zero the turrets at your chosen distance and note how many clicks you need for longer shots.
Mounting and Fit
Choose scope rings sized for the main tube. Eye relief is listed as 1.50″, so set the scope far enough forward that recoil cannot drive the eyepiece into your brow, then level the reticle and confirm you get a full sight picture with a natural cheek weld. Listed length is 6″.
Build and Durability
The tube is aluminum, finished in matte black. Listed weight is 18.10 oz. Check ring screw torque after the first range session and again before hunting season.
Honest Limitations
Every scope involves trade-offs. More magnification brings a narrower field of view, more visible shake and more heat mirage on warm days, and a larger objective adds weight and height over the bore. Budget and mid-priced scopes can be excellent values, but their adjustments and low-light performance do not match premium glass, so match the scope to how and where you hunt or shoot.
Low-light performance depends on the objective size, coatings and your own eyes as much as the spec sheet, so compare scopes at dusk if you can.
Sighting In
Bore sight first, then fire a three-shot group at 25 yards to get on paper and move to 100 yards to refine. A 100-yard zero is the common starting point for centerfire hunting rifles, 50 yards for rimfires, and the distance your ballistic data assumes for long-range work. Confirm the zero with the exact ammunition you plan to use.
Care and Storage
Keep lens caps on in the field, clean the glass with a lens brush and microfiber cloth instead of a shirt tail, and store the rifle where temperature swings will not fog the optics. Recheck zero after any hard knock or after travel.
Before You Buy
Confirm the ring size, mounting height and the distances you shoot most. Riflescopes are not firearms and ship without an FFL transfer.
Specifications
- Brand: Trijicon
- Model: ACOG
- Magnification: 4x
- Objective: 32mm
- Reticle: Illuminated Green LED Crosshair .223 / 5.56 BDC
- Click value: 2 Clicks per Inch @ 100 yds
- Field of view: 36.80 ft @ 100 yds
- Eye relief: 1.50″
- Finish: Matte Black
- Length: 6″
- Weight: 18.10 oz
- UPC: 719307308183
Who It Is For
The Trijicon ACOG 100390 is a great fit for 22 LR and 17 HMR shooters, plinkers and small-game hunters.
Buy the Trijicon ACOG 100390 at MAG5 Firearms
MAG5 Firearms is a family-owned FFL in Collegeville, Pennsylvania. Order the Trijicon ACOG 100390 online, or browse our riflescopes and scope mounting for rings and bases. For factory details, visit Trijicon.
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