STTI ST-23 NBB Gas Pistol; CO2 version

STTI
Code: GC-0302
£79.99
  • Polymer construction
  • Suppressor barrel extension included
  • CO2 Magazine - Works better in the cold!

The sneaky snipers' best friend is now even better in cold weather! The STTI ST-23 NBB Gas Pistol; CO2 version, is exactly what you need if you plan to take part in any sneaky outdoor gameplay. This pistol is well-known and well-loved in the Airsoft community for its affordability, often leaving users surprised with just how good its performance is.

Its full polymer construction keeps the weight low but also feels great in the hand, with plenty of texturing so you can be sure that you have good handling on this pistol whenever you use it. This sidearm also comes with a "power up" suppressor, which means it has an inner barrel within it. When it's installed, it doubles the length of the inner barrel for more range and power.

Full description

Description

If you're working on a hitman loadout, or you need a sneaky sidearm for your sniper setup, the STTI ST-23 NBB Gas Pistol; CO2 version can do both! As it is powered using CO2, this sidearm avoids the typical issues of using gas guns in cold weather; it will not gas out like a regular green gas sidearm. It will also be more consistent in FPS in general, which is always a bonus!

Starting at the front of this pistol, we find threading at the end of the barrel, which is for the included suppressor. The suppressor has an inner barrel within it, so when it is installed, you are doubling the length of the inner barrel, meaning the pistol will be more powerful and shoot further.

Just behind the threading, there is a front iron sight blade. This pairs with the rear iron sights, which allow you to centre the post on your enemy using the notch. Sadly, these sights are not adjustable, but they are useful for quickly lining up some shots if you get caught by surprise while on the battlefield.

The slide is fixed in place; this means that it can not be racked, nor does it slide back when shot. Although this takes some of the realism away, it means that the pistol uses less gas and is quieter every time you shoot it. Even though it is fixed, it still has slide serrations; they don't benefit the function of the pistol, but they do add extra bonus style points.

Moving on to the controls of the pistol, these are all non-functional except for the trigger and magazine release. They are there purely for aesthetics and offer no use or functionality for the pistol. The magazine release is functional and offers an ambidextrous paddle design just behind the trigger, allowing you to drop the magazine with whichever hand you wield this pistol in. The trigger has a wide, curved design, making pulling it really easy and comfortable.

The polymer pistol grip has plenty of texturing on it, so you can have a secure grip at all times. On the left and right flanks, there is a faux stippling design, which is less harsh than traditional stippling but still offers good gripping qualities. The front and back of the grip have a tenderiser-style of texturing, which provides a sublime grip with your fingers wrapped around it.

At the bottom of the pistol grip, you will find the magazine well. This is where you insert your CO2 magazine, and it will lock in, making the pistol ready to shoot. There is also a lanyard loop at the rear of the magazine well, which allows you to set up a lanyard sling so you can carry this pistol easily if you don't wish to carry a holster.

For this pistol, we advise that you chrono it with both the suppressor on and off, as the FPS can vastly change. If you need a sneaky sidearm for your outdoor games, the STTI ST-23 NBB Gas Pistol; CO2 version is an excellent choice for the colder weather. It can be both a sidearm and a primary if you're up for the challenge!

Features

  • Non-blowback fixed slide - Uses less gas and is quieter
  • Gas-powered airsoft pistol - Uses 12g CO2 bulbs
  • Mock suppressor included - Inner barrel extension for better FPS and range
  • Threaded outer barrel - Standard MK23 size
  • Slider style HOP adjust - Found on the top of the pistol
  • Ambidextrous magazine release - Push down on either side
  • Integrated ironsights - Non-adjustable, but great for quickly acquiring a target
  • 28rnd green gas magazine - Spares needed if you want to run it as a primary
  • Both CO2 and Green gas magazines are available
  • Amazing gas efficiency - Fixed slide and efficient system
  • Perfect sniper backup - Surprisingly good range and accuracy
  • Solid polymer construction - Lightweight and agile
  • Alloy inner frame - Durable and well-performing

Package Includes

  • STTI ST-23 NBB Gas Pistol; CO2 version
    • CO2 Magazine
    • "Power Up" Suppressor

Specification

General

Weapon Construction External
Platform Type
Pistol
Over 18 Only Icon
Over 18
Yes
Icon UKARA - United Kingdom Airsoft Retailer Association
Defence / UKARA Required
Yes, No,
Screwdriver Icon
Prebuilt
Yes
Package
Included Items
  • Magazine
  • Suppressor
Skill Level Icon
Skill Level
Regular Player
Patrol Base - Warning Icon
Warnings
Use CO2 bulbs with caution
Lubrication is required

Weight and Dimension

Weight KG Icon
Weight (KG)
Approx.0.42KG
Weapon Length Collapsed
Length
24.5cm
Weapon Length Extended
Length (Extended)
43cm

Construction

Colour Wheel Greyscale
Primary Colour
Black
Construction Icon
Construction
Polymer slider, grip, suppressor and controls. Alloy internal frame and inner barrel.

Weapon Specific

Power Source Icon
Powered By
CO2
Blowback Icon
Blowback
None
Weapon Platform
Weapon Platform
Pistol, MK23,
Magazine Style Icon
Magazine Style
Pistol Magazine, MK23,
Fire Select Icon
Fire Selector
PatrolBase | Fire Select Safe
Safe
Patrol Base | Fire Select - Semi Automatic
Semi Automatic
Weapon Safety Features Icon
Safety Features
Two Stage Trigger
Shooter Configuration Icon
Shooter Configuration
Right Handed
Weapon Configuration Icon
Weapon Configuration
Standard
Weapon Scale Icon
Weapon Scale
1:1
Suggested BB Weight
Suggested BB Weight
0.25g

Hop-Up

Hop-Up Unit Adjuster Icon
Hop-Up Adjuster
Slider
Hop-Up Unit Location Icon
Hop-Up Location
Visible on top of the platform.

Furniture

Weapon Furniture Icon
Furniture
  • Suppressor
  • Ambidextrous Magazine Release
  • Textured Pistol Grip
  • Ironsights
  • Outer Barrel Extension
  • Threaded Outer Barrel
Sight Type Icon
Sight Type
Iron Sights

Barrel

Inner Barrel Diameter
Inner Barrel Diameter
6.08mm

Magazine Specific

Magazine Type
Magazine Type
Gas
Magazine BB Capacity
Magazine BB Capacity
Approx. 28 Rounds

Gas Gun Specific

Gas Can Icon
Gas Compatability
CO2

Testing

FPS Icon
FPS, using 0.20g BBs
Approx.350fps ± 10%, using 0.20g BBs

Product Testing Data

Notepad Icon
Test Description
350 FPS +/- 10%
Notepad Icon
Tested Using
0.2g EAGLE™ BBs & Swiss Arms 12g CO2
Notepad Icon
Test Date
23/09//2025

Size guide

Joule Charts

Special Instructions

These table can be used as a reference to see if the BB weight you are using will be over acceptable Joulage limits at some Airsoft Sites in the UK. To check if the weight can be used chrono your weapon using the BB you intend to use, and then compare it to the chart.

FPS, Power and Joule Limits can vary from site to site, so please get in touch with where you're going to play with in advance to avoid disappointment.

Suggested limits are based on Joulage Limit rules used Halo Mill: Proving Grounds, with a 350fps limit for Automatic Replicas, 400fps for Semi-Automatic Replicas, and 500fps for Bolt Action Replicas.

Tap the tabs below to open the relevant chart for your replica.

Suggested limits are based on Joulage Limit rules used Halo Mill: Proving Grounds, and is the equivalent of 350fps, using 0.20g BB resulting in an upper limit of 1.14j.

Velocity BB Weight (Grams)
FPS 0.20 0.25 0.28 0.30 0.32 0.36 0.40 0.43 0.45 0.50
250 0.58 0.73 0.81 0.87 0.93 1.05 1.16 1.25 1.31 1.45
260 0.63 0.79 0.88 0.94 1.00 1.13 1.26 1.35 1.41 1.57
270 0.68 0.85 0.95 1.02 1.08 1.22 1.35 1.46 1.52 1.69
280 0.73 0.91 1.02 1.09 1.17 1.31 1.46 1.57 1.64 1.82
290 0.78 0.98 1.09 1.17 1.25 1.41 1.56 1.68 1.76 1.95
300 0.84 1.05 1.17 1.25 1.34 1.51 1.67 1.80 1.88 2.09
310 0.89 1.12 1.25 1.34 1.43 1.61 1.79 1.92 2.01 2.23
320 0.95 1.19 1.33 1.43 1.52 1.71 1.90 2.05 2.14 2.38
325 0.98 1.23 1.37 1.47 1.57 1.77 1.96 2.11 2.21 2.45
328 1.00 1.25 1.40 1.50 1.60 1.80 2.00 2.15 2.25 2.50
330 1.01 1.26 1.42 1.52 1.62 1.82 2.02 2.18 2.28 2.53
335 1.04 1.30 1.46 1.56 1.67 1.88 2.09 2.24 2.35 2.61
340 1.07 1.34 1.50 1.61 1.72 1.93 2.15 2.31 2.42 2.68
345 1.11 1.38 1.55 1.66 1.77 1.99 2.21 2.38 2.49 2.76
350 1.14 1.42 1.59 1.71 1.82 2.05 2.28 2.45 2.56 2.85
355 1.17 1.46 1.64 1.76 1.87 2.11 2.34 2.52 2.63 2.93
360 1.20 1.51 1.69 1.81 1.93 2.17 2.41 2.59 2.71 3.01

Suggested limits are based on Joulage Limit rules used at Halo Mill: Proving Grounds, and is the equivalent of 400fps, using 0.20g BB resulting in an upper limit of 1.49j.

Velocity BB Weight (Grams)
FPS 0.20 0.25 0.28 0.30 0.32 0.36 0.40 0.43 0.45 0.50
250 0.58 0.73 0.81 0.87 0.93 1.05 1.16 1.25 1.31 1.45
260 0.63 0.79 0.88 0.94 1.00 1.13 1.26 1.35 1.41 1.57
270 0.68 0.85 0.95 1.02 1.08 1.22 1.35 1.46 1.52 1.69
280 0.73 0.91 1.02 1.09 1.17 1.31 1.46 1.57 1.64 1.82
290 0.78 0.98 1.09 1.17 1.25 1.41 1.56 1.68 1.76 1.95
300 0.84 1.05 1.17 1.25 1.34 1.51 1.67 1.80 1.88 2.09
310 0.89 1.12 1.25 1.34 1.43 1.61 1.79 1.92 2.01 2.23
320 0.95 1.19 1.33 1.43 1.52 1.71 1.90 2.05 2.14 2.38
330 1.01 1.26 1.42 1.52 1.62 1.82 2.02 2.18 2.28 2.53
340 1.07 1.34 1.50 1.61 1.72 1.93 2.15 2.31 2.42 2.68
350 1.14 1.42 1.59 1.71 1.82 2.05 2.28 2.45 2.56 2.85
360 1.20 1.51 1.69 1.81 1.93 2.17 2.41 2.59 2.71 3.01
370 1.27 1.59 1.78 1.91 2.03 2.29 2.54 2.73 2.86 3.18
380 1.34 1.68 1.88 2.01 2.15 2.41 2.68 2.88 3.02 3.35
390 1.41 1.77 1.98 2.12 2.26 2.54 2.83 3.04 3.18 3.53
400 1.49 1.86 2.08 2.23 2.38 2.68 2.97 3.20 3.34 3.72
410 1.56 1.95 2.19 2.34 2.50 2.81 3.12 3.36 3.51 3.90

Suggested limits are based on Joulage Limit rules used at Halo Mill: Proving Grounds, and is the equivalent of 500fps, using 0.20g BB resulting in an upper limit of 2.32j.

Velocity BB Weight (Grams)
FPS 0.20 0.25 0.28 0.30 0.32 0.36 0.40 0.43 0.45 0.50
250 0.58 0.73 0.81 0.87 0.93 1.05 1.16 1.25 1.31 1.45
260 0.63 0.79 0.88 0.94 1.00 1.13 1.26 1.35 1.41 1.57
270 0.68 0.85 0.95 1.02 1.08 1.22 1.35 1.46 1.52 1.69
280 0.73 0.91 1.02 1.09 1.17 1.31 1.46 1.57 1.64 1.82
290 0.78 0.98 1.09 1.17 1.25 1.41 1.56 1.68 1.76 1.95
300 0.84 1.05 1.17 1.25 1.34 1.51 1.67 1.80 1.88 2.09
310 0.89 1.12 1.25 1.34 1.43 1.61 1.79 1.92 2.01 2.23
320 0.95 1.19 1.33 1.43 1.52 1.71 1.90 2.05 2.14 2.38
330 1.01 1.26 1.42 1.52 1.62 1.82 2.02 2.18 2.28 2.53
340 1.07 1.34 1.50 1.61 1.72 1.93 2.15 2.31 2.42 2.68
350 1.14 1.42 1.59 1.71 1.82 2.05 2.28 2.45 2.56 2.85
360 1.20 1.51 1.69 1.81 1.93 2.17 2.41 2.59 2.71 3.01
370 1.27 1.59 1.78 1.91 2.03 2.29 2.54 2.73 2.86 3.18
380 1.34 1.68 1.88 2.01 2.15 2.41 2.68 2.88 3.02 3.35
390 1.41 1.77 1.98 2.12 2.26 2.54 2.83 3.04 3.18 3.53
400 1.49 1.86 2.08 2.23 2.38 2.68 2.97 3.20 3.34 3.72
410 1.56 1.95 2.19 2.34 2.50 2.81 3.12 3.36 3.51 3.90
420 1.64 2.05 2.29 2.46 2.62 2.95 3.28 3.52 3.69 4.10
430 1.72 2.15 2.40 2.58 2.75 3.09 3.44 3.69 3.86 4.29
440 1.80 2.25 2.52 2.70 2.88 3.24 3.60 3.87 4.05 4.50
450 1.88 2.35 2.63 2.82 3.01 3.39 3.76 4.04 4.23 4.70
460 1.97 2.46 2.75 2.95 3.15 3.54 3.93 4.23 4.42 4.91
470 2.05 2.57 2.87 3.08 3.28 3.69 4.10 4.41 4.62 5.13
480 2.14 2.68 3.00 3.21 3.42 3.85 4.28 4.60 4.82 5.35
490 2.23 2.79 3.12 3.35 3.57 4.02 4.46 4.80 5.02 5.58
500 2.32 2.90 3.25 3.48 3.72 4.18 4.65 4.99 5.23 5.81
510 2.42 3.02 3.38 3.62 3.87 4.35 4.83 5.20 5.44 6.04