Trijicon ACOG 4×32 RMR Red Crosshair Excellent Combo

Description

The fixed magnification argument against an ACOG has one obvious answer, and this is it. The Trijicon ACOG 4×32 RMR Red Crosshair is Trijicon TA31-C-100550: the 4×32 BAC prism with a red crosshair bullet drop reticle, and a Trijicon RMR Type 2 red dot mounted on the top of the housing. Magnified glass for distance, an unmagnified dot for everything inside twenty five yards, on one rifle.

How the Piggyback Red Dot Works on the Trijicon ACOG 4×32 RMR Red Crosshair

The RMR sits on a mount bolted across the top of the ACOG body, sighted independently and zeroed separately. To use it you roll the rifle roughly thirty degrees inboard so the dot comes into your line of sight, which sounds awkward and takes about an afternoon to become automatic. From there you have two completely independent sighting systems on one gun, and neither depends on the other working.

That independence is the real argument for a piggyback red dot rather than a low power variable. An LPVO at 1x is a compromise: it is not quite as fast as a dot and the glass is between you and the target either way. Here the 4x is a genuine 4x with an etched reticle and no battery, and the RMR is a genuine red dot with a parallax free sight picture. Neither is a compromise version of the other.

The ACOG reticle is a red crosshair BDC reticle calibrated for .223, which is the precise option in the Trijicon range. That pairing makes sense: the crosshair handles the distance work where precision matters and the dot handles the close work where speed matters, so neither reticle has to be a jack of all trades. The Trijicon ACOG 4×32 RMR Red Crosshair is the combination that suits shooters who genuinely use both ends of the envelope.

Trijicon ACOG 4×32 RMR Red Crosshair Specifications

The RMR Type 2 supplied with the Trijicon ACOG 4×32 RMR Red Crosshair is the 3.25 MOA model, which is the size most people settle on for a rifle: small enough to shoot precisely with, large enough to find in a hurry. The Type 2 designation matters because it is the revision where Trijicon reworked the electronics to survive the recoil impulse that killed early units mounted on pistol slides. On top of an ACOG it leads an easy life by comparison.

The ACOG itself is unchanged from the standard TA31: forged aluminium housing in matte black, 1.5 inches of eye relief, 0.32 inch exit pupil, 36.8 feet of field of view at 100 yards and a 66 foot submersion rating. Illumination is fibre optic by day and tritium by night with no batteries anywhere in the prism. The TA51 flat top thumbscrew mount is included.

• Trijicon model TA31-C-100550, ACOG 4×32 BAC with RMR
• Magnification and objective: fixed 4x32mm
• Reticle: red crosshair BDC reticle, .223 calibrated
• ACOG illumination: fiber optics and tritium, no batteries
• Piggyback red dot: RMR Type 2, 3.25 MOA red dot
• Bindon Aiming Concept: yes
• Eye relief: 1.5 in. Exit pupil: 0.32 in
• Field of view: 36.8 ft at 100 yards
• Housing: forged aluminium, matte black
• Submersion depth: 66 ft
• In the box: TA51 flat top mount and RMR mount. UPC 719307311787

Honest Notes on the Trijicon ACOG 4×32 RMR Red Crosshair

Start with the price, because it is the main objection. This is a two thousand dollar optic package, which is more than most complete rifles. You are buying two Trijicon optics and a mount, so the arithmetic is not unreasonable, but it is still a serious amount of money on top of a gun. If the close range capability is the only thing you want, an offset mount and a cheaper micro dot gets you most of the way there for a few hundred dollars.

Height over bore is the practical thing people underestimate. The RMR sits high above the barrel, roughly three and a half inches, which means at ten yards your rounds land well below the dot. It is predictable and easy to learn, but it has to be learned, and it is more pronounced than on a normal flat top mounted dot. Shoot it at five, ten and twenty five yards on paper before you assume you know where it hits.

Weight is the other honest cost. An ACOG with mount is already a little over a pound, and the RMR and its mount add more on top, all of it high and forward. On a lightweight carbine you will feel it during a long day. Rifles set up this way tend to be duty guns and range guns rather than something you carry all afternoon.

Everything true of a standard ACOG applies here too. Eye relief is 1.5 inches and the eye box is tight, so the Trijicon ACOG 4×32 RMR Red Crosshair rewards a repeatable cheek weld and punishes a sloppy one. And the ACOG reticle brightness is automatic rather than adjustable, which is usually an advantage and occasionally not, such as standing in a dark room looking out at bright daylight.

Every Trijicon ACOG 4×32 RMR Red Crosshair we list is current Trijicon production in the factory carton with both optics, the mounts, lens covers and warranty paperwork. MAG5 Firearms is a family run FFL dealer in Collegeville, Pennsylvania, and optics ship direct to your door with no transfer needed.

See more rifle optics at MAG5 Firearms, or check the Trijicon TA31-C-100550 specification sheet from the manufacturer.