.357 Caliber / 9mm Brass Jag

In stock

SKU: JG-0001-357

Product

.357 Caliber / 9mm Brass Jag

In stock

SKU: JG-0001-357

$3.00

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.22

$3.00

.357 / 9mm

$3.00

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Four of the most popular handgun cartridges in the world share nearly identical groove diameters - and this .357 / 9mm brass jag cleans all of them. The .357 Magnum, .38 Special, 9mm Luger, and .380 ACP all have grooves between 0.355" and 0.357", making this one gun cleaning jag that covers your entire pistol rotation. The pointed brass tip holds a cleaning patch centered and pressed firmly against the bore walls for maximum fouling removal.

Pistol bores foul differently than rifles. Lower velocities mean less copper fouling but more unburned powder residue and lead deposits - especially from .38 Special wadcutters and unjacketed .357 loads. Semi-auto 9mm pistols also accumulate carbon around the feed ramp and chamber throat. A brass jag pushes a solvent-soaked patch into direct contact with these deposits, dissolving them faster than a loose patch draped over a slotted tip. The difference is clear on the first pass.

For bore cleaning with this jag, 1.25" to 1.5" square patches fit best - just enough to wrap tight around the tip without bunching. After your brush work, alternate wet and dry patches on the jag until they show no color. Finish with one oiled pass for protection. This brass jag handles the daily gun cleaning that keeps a carry pistol or range revolver reliable.

Caliber:

.357 Magnum, .357 Sig, .380 ACP, .38 Special, 9mm

Product Type:

Jag

Firearm Type:

Pistol, Revolver

Use Case:

Final Patch Cleaning

Jag Material:

Brass

Tip Style:

Pierce

Bore Diameter (in):

0.357

Thread Size:

8-32

Pack Size:

10-Pack, 20-Pack, 3-Pack, 5-Pack, Single

Country of Origin:

Imported (China)

Brand:

GUNNIX

What size cleaning jag do I need for 9mm?

Use a jag labeled ".357/.38/9mm" with 8-32 threading. The 9mm (0.355"), .38 Special (0.357"), and .357 Magnum (0.357") all share nearly identical bore diameters. One jag fits all three. This same jag also works for .380 ACP (0.355"). You don't need separate jags for each of these calibers.

How do I use a brass jag to clean my pistol?

Thread the jag onto your cleaning rod, center a patch on the jag's pointed tip, and push through the barrel from the chamber end. The patch wraps tightly around the jag, wiping the bore walls as it passes through. When the jag exits the muzzle, the patch drops off. Pull the rod back, attach a fresh patch, and repeat until patches come out clean. Start with solvent-soaked patches, finish with dry ones, then one oiled patch for protection.

Is a jag better than a slotted tip for pistol cleaning?

A jag provides tighter bore contact and removes more fouling per pass - it's the precision tool. A slotted tip is more forgiving: any patch size works, and you can run it back and forth. Many pistol shooters use a slotted tip for the first few wet passes (getting solvent in) and switch to a jag for the final dry passes (checking if the bore is clean). If you own one, make it a jag - it does the more important job.

Can I use my 9mm jag to clean revolver cylinder chambers?

The jag will pass through the cylinder chambers, but it may be slightly undersized - revolver chambers are wider than the bore. The jag gives a loose fit in the chamber, which means the patch doesn't grip the walls firmly. For chamber cleaning, a bore mop or oversize brush works better. The jag excels in the barrel bore where caliber-specific fit matters most.

Why does my patch turn blue-green even though I just cleaned the bore?

If you're using an ammonia-based copper solvent, the brass jag itself is reacting with the solvent - the blue-green color is dissolved brass, not copper from the bore. This is called a "false copper reading." It's harmless to the barrel but misleading. Solutions: use a standard (non-ammonia) bore cleaner, switch to a nickel-plated jag for copper-solvent sessions, or accept that the first half-inch of color is from the jag and look for changes beyond that.

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