Groove ^new^ | Molly

If you find a bullet with exactly heavy groove and the rest smooth or faintly hexagonal, you can instantly identify the family of firearms (certain Glocks, for example) and even the specific brand of aftermarket barrel. In one famous 2019 case in Arizona, a shooting suspect claimed his gun was a "common model." But the Molly Groove on the recovered bullet was positioned at 22 degrees offset from the extractor mark—a unique anomaly from a worn tool in the factory. That groove convicted him.

Unlike traditional "lands and grooves" (which look like raised bumps and valleys cut into the barrel), polygonal rifling looks like a hexagon or octagon twisted down a tube—no sharp corners. This design creates a better gas seal, boosts velocity, and reduces lead fouling. molly groove

To understand the Molly Groove, you first have to understand a dirty little secret of firearm engineering: lead bullets are messy. As a bullet travels down a rifled barrel, the soft lead can strip or melt, leaving a residue of “leading” behind. To fix this, many modern handguns (like the Glock, Smith & Wesson Sigma, and Kahr series) use a specific type of polygonal rifling. If you find a bullet with exactly heavy

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If you’ve ever watched a crime show, you’ve heard of ballistic fingerprinting—the idea that every gun leaves unique scratches on a bullet. But here’s the twist that Hollywood usually gets wrong: the most important marking on a bullet often isn’t a scratch at all. It’s a negative space , a ghost of a shadow left behind by something called the Molly Groove . Unlike traditional "lands and grooves" (which look like