Weihrauch HW100X BP K Bullpup Adjustable
The Weihrauch HW100X BP K Bullpup Adjustable is a compact pre-charged pneumatic air rifle developed around Weihrauch’s established HW 100 X platform. By using a bullpup configuration, the main action is positioned farther toward the rear of the rifle, allowing overall length to be reduced while preserving a practical barrel arrangement and the operating characteristics associated with the HW 100 X family.
Built for users who value a shorter platform, adjustable ergonomics, regulated PCP operation, and ambidextrous handling, the HW100X BP K combines several established Weihrauch features with the company’s newer X-series air system. The rifle is available in multiple calibres and power configurations, although the exact version offered can depend on national regulations and regional distribution.
Compact Bullpup Configuration
A defining characteristic of the Weihrauch HW100X BP K Bullpup Adjustable is its short bullpup layout. Unlike a conventional rifle, where much of the action sits ahead of the trigger, the bullpup format moves the action and magazine assembly rearward.
As a result, the BPK version can provide a comparatively short overall platform without simply reducing every component proportionally. Weihrauch lists the HW 100 X-BPK at approximately 590 mm overall in its 16.3-joule and lower-power configurations, with a 310 mm barrel. FAC specifications differ according to calibre and configuration.
This compact arrangement can make the rifle easier to handle where space is limited. However, users should always maintain proper muzzle awareness and safe handling regardless of overall rifle length.
Adjustable and Ambidextrous Stock
The stock is designed for both right- and left-handed shooters. A soft-touch exterior finish is used to provide a secure contact surface, while the butt plate can be adjusted for height and lateral position.
These adjustments allow the rear interface of the rifle to be adapted to different body proportions and shooting positions. Consequently, cheek placement, shoulder contact, and sight alignment can be configured more consistently.
The compact pistol-grip configuration also contributes to the distinctive handling characteristics of the bullpup design.

Key Stock Features
- Ambidextrous stock configuration
- Soft-touch external finish
- Height-adjustable butt plate
- Side-adjustable butt plate
- Compact bullpup architecture
- Pistol-grip layout
- Fore-end accessory mounting provision
250-Bar PCP Air System
The HW 100 X generation introduces an aluminium compressed-air cylinder designed for a maximum filling pressure of 250 bar. Compared with earlier HW 100 configurations, Weihrauch states that the X-series cylinder contributes to reduced weight while providing increased shot capacity.
A built-in pressure gauge allows the remaining cylinder pressure to be checked, while a Quick-Fill connection is included for filling the air reservoir using appropriate PCP charging equipment.
Because compressed air is stored at very high pressure, filling equipment must always be correctly rated and used according to the manufacturer’s procedures.
Redesigned Regulator
A regulator forms an important part of the HW100X operating system. Its role is to meter compressed air so that a controlled quantity is supplied for each shot.
For the HW 100 X generation, Weihrauch redesigned the regulator with the objective of improving consistency. Combined with the 250-bar aluminium cylinder, this system supports the repeatable pressure management expected from a regulated PCP platform.
Actual shot count depends heavily on calibre, energy level, pellet choice, environmental conditions, and the specific regional configuration of the rifle.
14-Shot Rotary Magazine
The Weihrauch HW100X BP K Bullpup Adjustable uses a removable rotary magazine holding 14 pellets.
A multi-shot magazine allows several pellets to be loaded in advance rather than requiring a pellet to be inserted manually before every shot. Nevertheless, safe muzzle direction and normal firearm-handling discipline remain necessary whenever the magazine is installed or removed.
The magazine retention system is positioned around the receiver area, with the bullpup configuration keeping this assembly close to the shooter.
Forward Biathlon-Style Cocking Lever
One important adaptation made for the bullpup version is the forward-positioned cocking lever.
Because the action is located farther rearward, Weihrauch uses an extended arrangement that positions the operating lever within practical reach. A biathlon-style lever is fitted, helping distinguish the HW 100 X-BP/BPK design from a conventional rear-mounted sidelever layout.
Left-handed lever configurations are also available, depending on specification and market availability.
Two-Stage Adjustable Match Trigger
Trigger control is provided by a two-stage adjustable match trigger with a manual safety.
The first stage provides initial movement before the second-stage release point is reached. Trigger weight and release characteristics can be adjusted according to the manufacturer’s instructions.
On the bullpup model, access to the trigger adjustment system requires removal of stock components. Therefore, adjustments should only be performed in accordance with Weihrauch’s official manual and with the rifle completely unloaded and depressurised where the procedure requires it.
Scope Mounting Options
The platform can be configured with either a Picatinny scope rail or an 11 mm dovetail-style mounting interface.
This allows compatible optical equipment to be fitted according to the specific rifle configuration. Because bullpup rifles position the shooter differently relative to the action, particular attention should be given to correct scope height, eye relief, and mounting position.
A Picatinny mounting section is also located on the fore-end for compatible accessories.
Calibre Options
The current HW 100 X-BP/BPK platform is listed by Weihrauch in:
- 4.5 mm / .177
- 5.0 mm / .20
- 5.5 mm / .22
Availability varies by country, and not every calibre or energy specification will necessarily be supplied in every jurisdiction.
Energy levels can include lower-powered regulated-market versions, 16.3-joule configurations, and FAC-rated versions where legally permitted.
Barrel and Muzzle Configuration
In standard configuration, Weihrauch supplies the HW 100 X-BP/BPK with an air stripper.
The BPK version uses a 310 mm barrel in the currently published specification. Different muzzle equipment may be offered according to market and legal restrictions.
A moderator is listed by Weihrauch as an optional configuration in markets where such equipment is lawful.
Practical Handling Characteristics
Because the HW100X BP K places much of its action closer to the shooter, its centre of mass differs from that of a conventional full-length sporter.
The reduced overall dimensions can make repositioning the rifle easier, particularly when compared with longer HW 100 configurations. At the same time, users transitioning from a conventional rifle may need time to become familiar with the rearward action, different magazine position, and altered balance.
Correct shooting technique, secure backstops, appropriate eye protection, and strict muzzle discipline remain essential.
Maintenance and PCP Care
Routine care should focus on keeping the rifle clean, dry, and correctly stored.
Seals, filling connections, magazines, the barrel, pressure components, and mounting hardware should be inspected periodically. Petroleum-based products or unsuitable lubricants should never be introduced into high-pressure PCP components.
Any regulator, valve, cylinder, or pressure-system work beyond normal user maintenance should be completed according to Weihrauch’s service procedures or by an appropriately qualified technician.

Calibres, FAC, Power and Accessories
The compact PCP platform is produced in several calibre and power configurations so that the specification can be matched to different legal markets and sporting requirements. Weihrauch currently lists the HW 100 X-BP/BPK family in .177, .20, and .22 calibre, with a regulated 250-bar PCP system, a 14-shot magazine, and multiple energy configurations.
.177 Calibre / 4.5 mm
The .177 calibre version uses 4.5 mm pellets and is the smallest calibre currently listed for the platform.
In the compact BPK configuration, Weihrauch’s 2026 technical data lists an FAC version producing approximately 25 joules, depending on ammunition and test conditions. A 16.3-joule version is also listed, together with a lower-powered 7.5-joule configuration intended for markets where that energy class is relevant.
The relatively small pellet diameter means that .177 ammunition is widely available in numerous weights and designs. Pellet selection should nevertheless always match the calibre marked on the rifle.
Different pellet masses can also produce different measured velocities. Therefore, velocity alone should not be used to determine muzzle energy without considering projectile weight.
.20 Calibre / 5.0 mm
A 5.0 mm / .20 calibre configuration is also available.
This calibre sits between .177 and .22 in pellet diameter and provides another option for users who prefer the characteristics of a medium-sized projectile.
According to Weihrauch’s current technical table, the compact FAC BPK configuration is listed at approximately 30 joules in .20 calibre. A 16.3-joule configuration is also listed. However, the 7.5-joule version shown for some other calibres is not listed for .20 in the same factory data.
Availability can vary substantially between national distributors, so the factory listing does not necessarily mean every version will be stocked in every country.
.22 Calibre / 5.5 mm
The 5.5 mm / .22 calibre configuration uses a larger and generally heavier pellet than the .177 version.
For the compact FAC configuration, Weihrauch’s 2026 data lists approximately 35 joules. The manufacturer also lists a 16.3-joule version and a lower-powered 7.5-joule version for appropriate markets.
Because pellet weights differ considerably between manufacturers, measured velocity will vary according to the ammunition used. Energy figures should therefore be interpreted as model specifications rather than a guarantee that every pellet will produce an identical reading.
FAC Power Configuration
The abbreviation FAC is commonly used in the airgun market to identify higher-energy versions intended for jurisdictions where appropriate licensing or legal authorization is available.
It is important to understand that FAC is not a universal power figure. Rather, the designation distinguishes a higher-output factory configuration from restricted-energy versions.
For the current compact BPK platform, Weihrauch lists approximate FAC energy levels of:
- .177 / 4.5 mm – 25 joules
- .20 / 5.0 mm – 30 joules
- .22 / 5.5 mm – 35 joules
These figures apply to the current compact BPK data and should not automatically be applied to the longer BP version. The longer HW 100 X-BP can have different barrel lengths, velocities, and FAC energy specifications.
16.3-Joule Versions
Weihrauch also offers 16.3-joule configurations across the listed calibres.
A regulated-market version at this energy level may be appropriate in jurisdictions where specific legal thresholds apply. However, legal treatment differs from country to country.
Ownership requirements, licensing, age restrictions, transport rules, approved shooting locations, and permitted uses should always be checked with the relevant authorities.
7.5-Joule Versions
Lower-powered 7.5-joule configurations are listed for .177 and .22 in the current factory data.
These versions are associated particularly with markets where lower-energy airguns have a different regulatory classification.
Again, the presence of a factory specification does not establish whether a particular model can be purchased or possessed without authorization in a specific country.
250-Bar PCP Air System
The X-series uses an aluminium compressed-air cylinder rated for a 250-bar filling pressure.
Weihrauch states that the revised aluminium cylinder reduces overall weight while improving shot capacity compared with the previous-generation HW 100 system. A redesigned regulator is also used to improve consistency across the usable pressure range.
The cylinder includes an integrated pressure gauge and Quick-Fill arrangement.
Only high-pressure charging equipment designed for PCP use should be connected to the rifle. Filling pressure must never exceed the manufacturer’s stated limit.
Magazine Capacity
All currently listed BP/BPK calibre configurations use a 14-shot rotary magazine.
The magazine must correspond to the correct calibre. A .177 magazine, for example, should not be treated as interchangeable with a .22 magazine.
Spare magazines can therefore be considered useful accessories when they match the exact rifle configuration.
Optics and Mounting Accessories
Depending on the version supplied, the platform can be configured with either a Picatinny scope rail or an 11 mm prism-style rail.
Compatible accessory categories can include:
- Riflescopes
- Correctly sized scope rings
- Picatinny-compatible mounts
- 11 mm dovetail mounts
- Optical sight accessories
- Lens covers
- Eye-relief spacers where appropriate
Mount compatibility should always be confirmed before installation.
Fore-End Accessories
A Picatinny mounting section is provided on the fore-end of the bullpup stock.
This mounting point can accept compatible sporting accessories where lawful and suitable. Excessive accessory weight should be avoided because it can affect balance and handling.
Air-Filling Accessories
PCP charging accessories can include a correctly rated:
- High-pressure hand pump
- PCP compressor
- Charging cylinder
- Fill hose
- Pressure gauge
- Compatible fill adapter
- Replacement sealing components
Weihrauch also identifies a dedicated 250-bar filling adapter within its air-cylinder documentation. Any filling system must be rated for the operating pressure and used according to the manufacturer’s instructions.
Muzzle Accessories
The BP/BPK is supplied with an air stripper as standard. Weihrauch also references moderator configurations or accessories in markets where they are legally permitted.
Muzzle devices should only be fitted when they have the correct thread, dimensions, and legal status.
Choosing the Correct Configuration
Calibre, muzzle energy, barrel configuration, air consumption, pellet characteristics, and local regulations should all be considered together.
The .177, .20, and .22 versions share the same general regulated PCP architecture, but their factory energy figures differ. Likewise, FAC, 16.3-joule, and lower-powered versions should be treated as distinct configurations rather than interchangeable settings.
Before use, the exact calibre and specification marked on the individual rifle should always be confirmed, and local regulations should be checked for ownership, transportation, storage, permissible power, and accessory restrictions.
Weihrauch HW100X BP K Bullpup Adjustable Overview
The Weihrauch HW100X BP K Bullpup Adjustable brings the established HW 100 operating concept into a notably compact configuration. Its regulated 250-bar PCP system, 14-shot magazine, adjustable ambidextrous stock, forward biathlon lever, two-stage trigger, and flexible scope-mounting arrangements define its technical character.
Most importantly, calibre, energy level, ownership requirements, transport rules, storage obligations, permitted uses, and accessory legality vary considerably between jurisdictions. Users should therefore verify current local legislation before acquiring, configuring, transporting, or using any air rifle.
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Frequently Asked Questions
What type of air rifle is this model?
This model is a pre-charged pneumatic, or PCP, air rifle built around a compact bullpup configuration. Instead of positioning the action well ahead of the trigger as seen on a traditional sporter-style rifle, much of the mechanical system is positioned farther toward the rear. Consequently, the overall rifle can remain relatively short while still retaining a practical barrel length and full PCP operating system.
The design also incorporates a regulated air system, removable rotary magazine, adjustable stock components, and a forward-positioned cocking mechanism. Together, these features give the platform handling characteristics that differ noticeably from those of a conventional full-length PCP rifle.
What does a bullpup design mean?
A bullpup design places the action and magazine behind, or close to, the trigger area rather than far in front of it. As a result, the rifle can be made significantly shorter without requiring an equally large reduction in barrel length.
This arrangement changes the balance of the rifle because more of its weight is positioned close to the shooter. Therefore, some users find the platform easier to manoeuvre in confined shooting positions. At the same time, people accustomed to conventional rifles may need a short adjustment period because the magazine, loading system, cheek position, and overall balance feel different.
Is the stock adjustable?
Yes. The stock incorporates an adjustable butt plate that can be repositioned vertically and laterally. These adjustments allow the contact point between the rifle and the shoulder to be adapted according to body size, preferred shooting position, and optical setup.
A properly adjusted stock can also help create a more consistent cheek position and eye alignment behind a mounted optic. However, adjustments should always be completed while the rifle is unloaded and pointed in a safe direction.
Accessory legality should also be checked locally, because regulations governing certain attachments can vary between jurisdictions.


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