1
Paint-to-bore fit
The ideal bore lets a ball roll slowly through the barrel and stop with a light breath of air behind it — not fall freely, not require force.
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07
Barrel Matching
Paint-to-bore match is the cheapest accuracy upgrade in paintball. This lesson teaches how to test and choose the right bore.
Academy progress0 / 8 lessons
What you will learn
- Understand paint-to-bore fit
- Choose between overbore and underbore
- Identify barrel threads and insert systems
Lesson steps
2
Overbore and underbore basics
Overbore (bore larger than paint) wastes air and hurts consistency; slight underbore seals better but too tight risks barrel breaks and pressure spikes.
3
Barrel insert systems
Insert kits let one barrel back match multiple bore sizes so you can adapt to whatever paint the field sells that day.
4
Barrel threading
Common threads include Autococker, Spyder, A5/X7, and Planet Eclipse proprietary backs. Thread type is model-specific and must match exactly.
5
Paint quality
Fresh, round, brittle-shelled paint outperforms any barrel upgrade. Store paint indoors, level, and rotate the boxes.
6
Weather effects
Heat softens shells and swells paint; cold makes shells brittle. Re-test bore fit whenever conditions change significantly.
7
Accuracy versus consistency
Barrels do not add accuracy; they add consistency. A matched bore reduces shot-to-shot variance, which is what makes you hit.
8
Safely testing paint fit
Test with the marker degassed and the barrel removed. Drop a ball in the barrel back and blow gently — never test fit with a gassed marker.
Safety warning
Test paint fit only with the barrel removed from a degassed marker, and stop using paint that is already breaking in the breech.
Equipment checklist
- Barrel insert kit or multiple bores
- Sample of the day's paint
- Barrel swab
- Barrel blocking device
- Notebook for bore records
Common mistakes
- Running a heavy overbore to avoid breaks
- Ignoring weather changes
- Testing fit on a gassed marker
- Assuming barrel length equals accuracy
Quick quiz
0 of 8 lessons completed