

- High-density polymer build
- NBB Pistol - Very efficient & accurate
- Fits VSR/GBB Inner barrels & HOP-up buckings
If you have a sneaky playstyle, an MK23 belongs in your arsenal! This phenomenally quiet Airsoft NBB pistol has been the sidearm of choice for Airsoft snipers since it was released, thanks to its impressive long-range performance, compatibility with VSR-10-style HOP-up buckings and barrels and its near inaudible muzzle report, especially when the inner barrel extension inside the included suppressor is swapped out for a foam filling.
Famed for its role in the Metal Gear Solid video game series as Snake's primary, as well as being featured in one of the coolest scenes in Breaking Bad, the MK23 is an absolute icon, both in Airsoft and the real steel world. The real MK23 finds its origins in the "OHWS-SOP" project, designed for US SOCOM operators requiring match-grade accuracy and exceptional durability.
Part of the reason the Airsoft MK23 is famed for being ultra quiet is due to its non-blowback action, avoiding the excessive noise of the slide cycling, which also provides the edge in gas efficiency and consistency. For those who simply must upgrade every Airsoft gun they own, the MK23 is compatible with VSR-10 style inner barrels and HOP-up buckings, with access to plenty of specific tuning parts to bring the very best from this already impressive platform!
Fast Delivery
Delivery & Postage
Here at Patrol Base, we send all our packages from our Warehouse based in the UK with the exception of European Warehouse Items. All of our parcels are sent with specially picked couriers to ensure your parcels get to you on time and in one piece.
For more information please check out our Delivery Information Page.
Estimates
Below are some rough postage prices for orders. Please note these are subject to change and are only a rough guide. For a more accurate postage estimate please use the Postage Calculator at the basket.
UK 3-5 day Standard
£6.95
From
Dispatched with 24hr UK mainland
£8.95
From
Highlands / Islands
£24.99*
From
* Please note that Scottish Highlands, and Islands postage prices can vary wildly. Please refer to the Postage Calculator at the basket for the lowest possible price.
Returns
We want you to be absolutely happy with our products and services, so we provide the simple Patrol Base guarantee: if on receiving your item you are unhappy with your item for any reason then simply send it back to us. We will replace or refund the item.
You can return any item for any reason whatsoever, even if you have just changed your mind, within 14 days of receipt of the order. This is in addition to your rights under the Consumer Protection (Distance Selling) Regulations 2000.
For more information on returning products, and how to do it please visit our Returns Policy Page.
Frequently purchased with this pistol...
Description
Whether you're a sniper seeking the perfect secondary or you need a stealthy sidearm with top-tier gas efficiency, the ASG MK23 Socom Airsoft Pistol with Silencer is a solid choice. Based on the original TM MK23 SOCOM design, the ASG version is far more affordable and ready to rock with green gas, maintaining access to the same vast upgrade aftermarket as the OG TM.
Being a non-blowback pistol, the MK23's slide does not cycle when the trigger is pulled. Instead, it uses all gas to propel the BB, with chambering the next shot carried out through the "double-action" trigger in a similar manner to a double-action revolver. This means the MK23 is far more efficient in terms of gas usage and far quieter than gas blowback pistols, making it a fantastic sidearm for snipers who value stealth.
The NBB action also handles cold weather far better and suffers less "cooldown" when shot quickly. Pair this with compatibility with VSR-10 barrels and HOP-up buckings, and you've got practically the perfect sniper sidearm, as affordable as it is upgradable!
Starting at the front, we can find 16mm CCW male threads at the tip of the outer barrel, allowing the included suppressor to be fitted, or an alternative device for 16mm CCW threading. The sights are positioned at the top of the slide, a simple set of combat iron sights set at "suppressor height", meaning they are slightly raised so you can still align them with a suppressor fitted.
The included polymer suppressor/silencer acts as an inner barrel extension, which increases the output FPS of the pistol when installed and also improves accuracy and consistency, as long as it is installed correctly. If you're planning on using the suppressor in a skirmish, we recommend installing the suppressor before testing FPS using the site's chronograph, as it does boost FPS by a fair margin (up by approximately 50FPS using 0.20g BBs).
If you need your MK23 to be quieter than a mouse fart, we recommend disassembling the suppressor (this requires submersion in hot water) and installing a foam filling, though please be aware that carrying out this mod will void your usual warranty on the pistol.
The slide of the MK23 doesn't move as part of its operation, but is nevertheless a perfect match for the real deal. Serrations are present at the front and rear, and while these shouldn't be used, they complete the authentic MK23 look. The angled surfaces of the slide are a big part of what gives the MK23 its cutting-edge, stealth bomber-style looks; it comes as quite a surprise that this pistol originates way back in the 1990s!
Moving down to the frame, we can find the "MK23 Universal" rail on the dustcover, designed for the specific MK23 LAM unit. These LAM units are practically unobtanium in Airsoft form (with one or two rare exceptions), but you can add a 20mm Picatinny Rail Adapter if you want to use a modern 20mm-compatible laser aiming module or a tactical flashlight.
The trigger guard is significantly enlarged, allowing plenty of space for full finger gloves and easy access to the double-action/single-action trigger. The double-action mode both loads the BB and shoots, allowing for rapid fire with a slightly heavier trigger feel than single-action.
To use single-action mode, simply cock the hammer at the rear of the slide before pulling the trigger. This provides a lighter and shorter trigger pull, ideal for precise, long-range shots. The trigger itself boasts a wide blade with a textured surface so you never slip off, whether you're shooting quickly or in wet weather conditions.
The magazine release is positioned where the trigger guard meets the grip, a paddle-style magazine release which needs to be pressed down to release the mag. The mag release is present on either side, making reloads easy for left or right-handed players.
The grip itself is a lot larger than most service pistol-sized platforms, primarily due to the real-world MK23's role as an "offensive handgun", i.e, a primary platform used instead of a rifle or SMG. The grip features crackle-textured panels on either side, with more aggressive pyramidal texture on the front and rear to keep the MK23 firmly in your hands during energetic movement.
On the rear, we are treated to a lanyard loop, allowing you to tether your MK23 to your belt so it doesn't slip from your holster and get lost in the woods. This feature is especially useful for snipers, who find themselves on their bellies more often than not. We wholeheartedly recommend adding a lanyard or a simple paracord loop, as there is nothing worse than spending time on game day trying to find your investment in the leaf litter!
As a platform for upgrades, the ASG MK23 has a lot of potential; being compatible with VSR-10 inner barrels and HOP-up buckings provides the opportunity to push the MK23's performance way beyond what most Airsoft pistols are capable of. If you want to find out more, check out our ASG MK23 Socom Pistol Review.
The other benefit of this is that the MK23 is stupendously quiet, especially with the included suppressor installed. So much so that it's not unheard of for MK23 players to get stepped on in the field before they're spotted. If you're after a sidearm which leans into stealth, range and accuracy, the ASG MK23 Socom Airsoft Pistol with Silencer is ideal!
Features
- High-density polymer build
- 16mm CCW Male threaded barrel - Suppressor included
- Suppressor with inner barrel extension - Boosts FPS by approx 50. Check with marshals before using
- Non-Blowback (NBB) airsoft pistol - Extremely gas efficient & accurate
- Double-action trigger - Cock the hammer for a shorter trigger pull
- Dummy slide lock works as a secondary safety - Push the slide lock up to lock the trigger for storage
- Ambidextrous trigger lock safety - The lever at the rear locks the trigger when the hammer is cocked
- Adjustable HOP-up unit - Accessible with the slide removed (see "Special Instructions")
- Ambidextrous magazine release - Easy reloads for left or right-handed shooters
- "MK23 Universal" frame rail - Add a 20mm Rail Adapter to use a flashlight or laser
- Lanyard loop - Add a retention lanyard to keep the MK23 tethered to your belt
- Compatible with ASG MK23 Socom NBB Magazines
- Want more intel on the ASG MK23? If so, check out our review: ASG MK23 Socom Pistol Review
Package Includes
- ASG MK23 Socom Airsoft Pistol with Silencer
- MK23 Socom Silencer
- 25rnd Green Gas Magazine
Special Instructions
This replica is a non-blowback, meaning the slide does not cycle when the replica is fired, making it much more efficient. Please do not manually work or rack the slide, as it is not designed to do this and will cause damage.
The included suppressor features a built-in inner barrel extension. When mounted, the suppressor increases FPS significantly (+50 FPS approximately using NUPROL 2.0 Green Gas) and may provide muzzle energy which exceeds skirmish site limits. We recommend consulting the site marshals before using the MK23 with the suppressor mounted in a skirmish.
The adjustable HOP-up of the ASG MK23 is inside the slide, accessible when the pistol is field stripped. The field stripping process is outlined as follows:
- Remove the magazine.
- Pull the slide back slightly until the squared-off notch on the left side of the slide aligns with the axis of the dummy slide lock lever. Hold the slide in this position. Please exercise caution when pulling back the slide; it is not designed to go all the way back, and pulling the slide too far can cause damage.
- Push the slide lock lever through from the right side. This can be quite firm, so we recommend using a plastic tool to apply pressure (we use a ballpoint pen with the ink removed).
- With the slide lock lever removed, push the slide forward from its default position by approximately 1cm. With the slide in this position, you should be able to lift it up and off the frame.
- The gear-style HOP-up adjuster is on the left side of the barrel. Turn this to adjust the trajectory for different ammo weights, seeking the flattest possible flight path for your BBs.
Specification
General
Platform Type | Pistol |
|---|---|
Over 18 | Yes |
Defence / UKARA Required | Yes, No, |
Included Items |
|
Skill Level | Regular Player |
Warnings | Lubrication is required |
Testing
FPS, using 0.20g BBs | Approx.320fps ± 10%, using 0.20g BBs |
|---|---|
Testing Notes | Tested using 0.20g Delta Armory Diamond BBs & NUPROL 2.0 Green Gas. FPS will rise by approx 50 with the suppressor mounted. |
Weight and Dimension
Weight (KG) | Approx.0.78KG |
|---|---|
Length | 25cm |
Length (Extended) | 44cm |
Construction
Primary Colour | Black |
|---|---|
Pre Two-Tone | No |
Construction | High density polymer build with alloy trim parts. |
Weapon Specific
Powered By | Green Gas |
|---|---|
Blowback Type | None |
Platform | MK23 |
Magazine Compatibility | ASG/STTI MK23 NBB Magazines |
Fire modes | Semi Automatic |
Safety Features | Trigger Lock |
Shooter Configuration | Right Handed |
Platform Configuration | Standard |
Platform Scale | 1:1 |
Suggested BB Weight | 0.25g |
Hop-Up
HOP-Up Adjuster Type | Gear |
|---|---|
HOP-Up Adjustment Location | Accessible when Slide and Frame Split |
Furniture
Furniture |
|
|---|---|
Rail System | Railed Mount Available, Unique, |
Sight Type | Iron Sights |
Sling Options | Lanyard Loop |
Barrel
Outer Barrel Length (in) | 5.87'' |
|---|---|
Outer Barrel Thread Type | Male |
Outer Barrel Thread Direction | CCW (Counter Clockwise) |
Outer Barrel Thread Size | 16mm |
Inner Barrel Diameter | 6.08mm |
Inner Barrel Length | 133mm |
Magazine Specific
Magazine Type | Gas, Low Capacity, |
|---|---|
Magazine BB Capacity | Approx. 25 Rounds |
Gas Gun Specific
Gas Type | Green Gas |
|---|---|
Gas Recommendation | Green Gas |
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.
This table should be used for reference, and cannot be used to check one weight against another, as the weight of the BB affects the power.
In order to check if the BB can be used with your replica chronograph using the weight you wish to use and then compare it against the table.
Every time you change weights you will need to re-chrono and check against the table. This is not a conversion chart between weights.
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 |








