Independent field journal · Practice, evidence, judgmentIssue No. 01 / Summer 2026
KGKNOWN GROUNDClarity and capability in a contested world
Newsletter
Interactive research

Compare like with like.

Start with a product family, then choose two records. Differences, sources, and documentation gaps stay visible.

Step 1

Choose what you are comparing

Compare product records outside the dedicated families.

Step 2

Select two other gear

Step 3

Review the differences

“Not documented” means Known Ground has not verified that field. It is not a zero, “none,” or compatibility claim.

Side-by-side comparison of Trijicon RMR HD and Aimpoint ACRO P-2
AttributeTrijiconTrijicon RMR HDSpecification review not datedAimpointAimpoint ACRO P-2Specification review not dated
Typical price$849.00$599.00
Weight1.69 oz2.1 oz
Overall dimensions0.89 x 0.67 in window0.63 x 0.63 in window
Product formatOpen emitterClosed emitter
Mount / compatibilityRMR footprintACRO footprint
Catalog statusRecommendedBest for hard use
BatteryTop-loadingSide-loading
EmitterOpenClosed
FootprintRMRACRO
Trijicon RMR HD6 of 6 displayed fields documentedNo manufacturer source attached
Aimpoint ACRO P-26 of 6 displayed fields documentedNo manufacturer source attached
Editorial context

Choose by use case, not scoreboard.

Trijicon RMR HD: The refined RMR: excellent, expensive, and easier to live with.

Aimpoint ACRO P-2: The weather-proof choice when bulk matters less than certainty.