How To Measure Barrel Diameter

How To Measure Barrel Diameter

Threaded Barrel End Installed
How to install a threaded barrel end on a non-threaded barrel.

HOW TO
How to measure barrel diameter
Requires precise measurements of your barrel to ensure our custom parts properly fit. This is ONLY for custom work. Any standard order does not need any measurement If you provide incorrect or fractional measurements, your adapter may not fit correctly. To re-machine your part, a $20 fee will be assessed, which includes shipping the fixed part back to you. Barrels without a front sight
We need three measurements for barrels without a front sight:
Measure the barrel diameter at the front.
Measure the barrel diameter 1 inch back from the front.
Barrels with a front sight
We need five measurements for barrels with a front sight:
Measure the barrel diameter at the front.
Measure the barrel diameter 1 inch back from the front.
Measure the width of the front sight at its widest.
Measure the step from the front of the barrel to the front of the sight.

Product Description
Now you can mount any size end-of-barrel accessory on your barrel non-threaded barrel—including front brakes, sound Reduction Device  with this high-quality barrel thread adapter.

This Aluminium barrel thread adapter easily attaches to the factory-finished plain front using two set screws. You can install it yourself in seconds and can be removed just as quickly.

Based on precise measurements of your barrel at the front and 1 inch back—which you provide after ordering—we can custom machine this barrel thread adapter to match your barrel’s diameter.

Thread Adapter Features and Benefits
Custom diameter to fit barrels from 12mm up to 30mm O.D.
Threads: 1/2″-20 TPI
Thread Length: 16mm
Bore Depth: 23 mm
Custom-machined to fit your non-threaded barrel.
Slip-on design is held in place with two set screws that remain flush when tightened.

Instructions After Ordering
To ensure a proper fit, please put the required information in the measurements.

Barrel Diameter – Precise measurement at the front and 1 inch back. Can be from 12 up to 30 mm diameter

Note: Measure using quality metal (NOT plastic!!!) calipers or a micrometer to ensure a proper fit.
Don’t worry, if you do not provide measurements during checkout, we will send you an email asking for the missing information.

***ALERT*** You MUST provide measurements (metric) to two decimal places (Example 17.45 because 14.3 will not fit)
Two decimal place (Ex 15.2) measurements will be suspect, but we will machine to your measurements and add proper clearance.
Rework fee is $20 and you pay for return shipping.
No refunds on parts that don’t fit because of your measurements.
 

The Techno Barrel Diameter Measuring Guide & Tool is a must-have accessory for airgun and rifle enthusiasts who need precise measurements of their barrel’s outer diameter (OD). Accurate measurement is critical before selecting adapters, silencers, or moderators, since even a 0.5 mm difference can cause improper fitting.

Crafted from hardened stainless steel with ±0.01 mm accuracy, this tool ensures reliable and repeatable measurements. Whether you use a PCP air rifle, spring piston gun, or CO₂ airgun, this guide helps you identify the correct barrel size and choose the right Techno CNC barrel adapter for a flawless fit.

Easy to use, durable, and globally compatible, this measuring tool simplifies one of the most important steps in barrel accessory installation.

Key Features

Precision Measurement of Barrel OD (0–30 mm Range)

±0.01 mm Accuracy for Perfect Adapter Matching

Hardened Stainless Steel Build for Long Life

Lightweight & Easy to Carry in Shooting Kits

Compatible with PCP, CO₂ & Spring Rifles

Recommended for Selecting Techno CNC Adapters