Will the Pro-Shot MP20 bore mop fit my 12 gauge shotgun?

No, the MP20 is strictly designed with a diameter profile for 20 gauge and 28 gauge smoothbore shotgun barrels. It lacks sufficient radial wall tension for larger 10, 12, or 16 gauge bores, meaning you would need a dedicated 12 gauge mop instead.

What cleaning rod thread size does this mop use, and will it fit my Australian-standard rod?

The Pro-Shot MP20 features a standard American #5/16-27 shotgun thread. If you are using standard American cleaning rods from brands like Pro-Shot, Dewey, or Hoppe's, it will attach directly, but Australian shooters using European metric rods or smaller rifle rods will need a thread adapter.

Can I use this mop to scrub out heavy carbon and baked-on lead deposits from my shotgun barrel?

No, this 100% thick-fill cotton mop is not designed for heavy carbon removal or severe plastic wad fouling. It is best used for applying gun oils, distributing rust inhibitors, or performing a final pass to remove residual solvent after using a bronze or brass bristle bore brush.

Will the brass core scratch the internal lining or choke tubes of my shotgun?

No, the MP20 is built with a durable solid brass core rather than steel, ensuring it will not scratch or damage delicate internal barrel surfaces or choke tubes during swabbing in the field or at the range.

Shotgun Bore Mop - Pro-Shot MP20

The Pro-Shot 20 & 28 Ga Brass Core Bore Mop is a dedicated shotgun maintenance tool designed for swabbing, light fouling removal, and liquid application across smoothbore barrels. Built with 100% thick-fill cotton fibers over a solid brass core, this cleaning attachment provides 360-degree surface contact inside shotgun barrels to evenly distribute gun oils, rust inhibitors, or wipe away residual chemical solvents following brush passes. It connects directly to standard cleaning rods utilizing an industry-standard American #5/16-27 shotgun thread.

Key Features

Solid Brass Core: Engineered with a non-abrasive brass core that prevents scratching or damaging the internal surfaces of barrels and choke tubes during cleaning strokes.
High-Density Cotton Construction: Features 100% thick-fill cotton fibers that absorb liquid lubricants, generating a foaming and spreading action to coat the bore evenly.
Multi-Bore Compatibility: Sized to maintain radial wall contact inside both 20 Gauge (.615 in / 15.6 mm) and 28 Gauge (.550 in / 14.0 mm) smoothbore shotgun barrels.
Standard Rod Threading: Equipped with a standard American #5/16-27 shotgun thread for direct attachment to matching shotgun cleaning rods.

Specifications

Brand: Pro-Shot Products
Model: MP20
Core Material: Solid brass
Mop Material: 100% thick-fill cotton fibers
Thread Size: #5/16-27 (Standard American Shotgun)
Calibre/Gauge Compatibility: 20 Gauge (.615 in / 15.6 mm) and 28 Gauge (.550 in / 14.0 mm)
Overall Length: Approximately 1.75 inches (44.5 mm)
Product Weight: Approximately 10–15 grams
Power Requirements: None (Mechanical maintenance accessory)

Who is the Pro-Shot 20 & 28 Ga Brass Core Bore Mop for?

20 Gauge Shotgun Shooters — Requires full 360-degree bore contact across 20 Gauge (.615 in / 15.6 mm) smoothbore barrels to evenly spread protectants or complete final solvent removal with a standard #5/16-27 threaded shotgun bore mop.
28 Gauge Shotgun Shooters — Needs a non-scratching brass-core shotgun bore mop that compresses effectively inside a 28 Gauge (.550 in / 14.0 mm) bore profile without binding during routine barrel maintenance.

Less suitable for: Shotgun barrels measuring larger than 20 Gauge (such as 10, 12, or 16 Gauge), which lack adequate radial wall tension and require a dedicated 10/12 Ga bore mop; firearms measuring smaller than 28 Gauge (such as .410 bore shotguns, rifles, or handguns), which will bind and require a .410 or #8-32 threaded rifle mop; and heavy carbon, plastic wad, or lead fouling removal, which requires a bronze or brass bristle shotgun bore brush.

SKU	PS41343LP
Model #	MP20
Brand	Pro-Shot
Shipping Weight	1.0000kg

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Pro-Shot Mp20 Shotgun Bore Mop 20 & 28 Ga Brass Core

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