Co-witness on a pistol works differently than on an AR-15, and most of the bad advice online comes from people applying AR-15 sight geometry to a Glock. On a pistol the optic is only a few millimeters above the slide, the irons are short, and there's no riser to push the optic up to a "lower 1/3" position the way an AR-15 carry-handle setup does. This guide covers absolute vs l …
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Walk into any gun shop or scroll any AR-15 parts forum and you'll find strong opinions about free-float handguards. "Free-float or bust." "The accuracy difference is negligible." "You need a torque wrench." "It's just a barrel nut swap." The noise around this topic tends to skip the most important question: do you actually need a free-float handguard for what you're doing with …
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Optic footprint mismatches drive more red-dot returns than any other slide question. The cut on your slide and the bolt pattern on your optic have to match — and the terminology is confusing because "RMR cut," "RMSc cut," and "Holosun K" refer to bolt patterns that are not interchangeable. This guide maps each footprint to the Glock platforms 3CR cuts slides for, explains …
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