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If you use copper-removing bore cleaners, you've probably seen patches turn blue even when your barrel is actually clean. That's because traditional brass jags are over 60% copper themselves, and aggressive solvents attack that copper just like they attack fouling in the bore. The Proof Positive .20 caliber jag solves this problem with a brass-free, proprietary alloy that looks and feels similar to brass but won't create false copper indicators.
What makes this jag stand out goes beyond just eliminating confusion about barrel cleanliness. Bore Tech engineered these with dual sets of contact rings and precision machining that creates concentric pressure on the barrel. The first ring in each set is rounded to help the jag center itself safely in the bore, while the subsequent rings have squared faces that grab and hold your patch securely in place. Between those ring sets, a relief space acts as a solvent reservoir, dispensing fresh cleaner as the jag moves through.
Each Proof Positive jag is caliber-specific for a reason. The length and diameter are matched to the .20 caliber and proper patch size, preventing the bunching and jamming issues that happen when you use generic or oversized jags. That means patches stay where they should be throughout the entire bore.
The reverse taper design at the rear of the jag provides a completely smooth, edge-free transition when threaded onto your cleaning rod. This design detail prevents damage to your barrel's crown, especially when pulling the rod back through the bore. The jag centers itself and lifts the rod off the bottom of the barrel instead of letting it drag, which matters if you care about long-term accuracy.
Brass jags create false positives when you use copper-removing bore cleaners. Because brass is over 60% copper, the solvent reacts with the jag itself, turning patches blue even when your bore is clean. The Proof Positive jag uses a brass-free alloy that won't react with copper solvents, so you actually know when your barrel is clean.
Yes. The jag is designed to be 100% barrel safe when used correctly. The reverse taper at the rear provides a smooth transition that prevents damage to the crown, and the rounded centering ring helps the jag seat properly in the bore. Just make sure you use the correct patch size for your .20 caliber.
That's exactly what this jag is designed for. It works perfectly with any copper-removing bore cleaner without creating the misleading blue discoloration you get with brass jags. Many people specifically buy Proof Positive jags because they use Bore Tech's Eliminator or other aggressive copper solvents regularly.
The .20 caliber Proof Positive jag has a male 5/40" thread, which fits standard rifle cleaning rods with 5/40" female threads. Before purchasing, verify that your cleaning rod accepts this thread size.
| UPC | 667739980289 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BTAJ-20-00 |
| Caliber/Gauge | .20 Caliber |
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