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What is a one-for-one variation on an FAC?

Firearms Licensing 21 May 2026 By Ashley Marshall

Quick Answer

A one-for-one variation on a Firearms Certificate (FAC) allows you to swap an existing firearm listed on your certificate for another, without increasing the total number of firearms you are authorised to possess. This administrative process is commonly used when you sell one firearm and wish to acquire a different one of the same type. The core principle is that your overall entitlement to firearms remains unchanged, maintaining your certificate's original firearm count.

Quick Answer

A one-for-one variation on a Firearms Certificate (FAC) allows you to swap an existing firearm listed on your certificate for another, without increasing the total number of firearms you are authorised to possess. This administrative process is commonly used when you sell one firearm and wish to acquire a different one of the same type. The core principle is that your overall entitlement to firearms remains unchanged, maintaining your certificate's original firearm count.

Understanding the One-for-One Principle

For UK firearms certificate holders, managing your authorised firearms typically involves applying for variations to your FAC. A "one-for-one" variation is a specific type of amendment where you intend to dispose of one firearm that is currently listed on your certificate and simultaneously or subsequently acquire another firearm of a similar type. The crucial element is that the number of firearms on your certificate does not change.

For example, if your FAC authorises you to possess three rifles and you currently own a .223 rifle, a .308 rifle, and a .22LR rifle, a one-for-one variation would allow you to replace, say, your .223 rifle with a new .243 rifle. You would still be authorised for three rifles, but the specific details of one would have changed. This process acknowledges your established good reason for possessing that category of firearm.

It is important to remember that while the number remains constant, the police still assess your good reason for the specific type and calibre of the new firearm, especially if it represents a significant change in capability or if your existing good reason doesn't obviously cover it.

When to Utilise a One-for-One Variation

This type of variation is typically requested in several common scenarios:

The Application Process: Navigating Your Local Force

The procedure for a one-for-one variation can vary slightly between different police forces across the UK. However, the general steps involve:

  1. Contacting Your Firearms Licensing Department: Your first step should always be to contact your local police firearms licensing unit. Many forces prefer initial contact by phone or email for variations.
  2. Completing the Variation Form: You will usually need to complete a specific variation application form, which requests details of the firearm you are disposing of (make, model, serial number, calibre) and details of the firearm you intend to acquire. If you don't know the exact new firearm yet, you may be granted an "open" slot for a particular type and calibre (e.g., "any .22LR rifle").
  3. Providing Details: Be prepared to provide comprehensive information about the new firearm, including make, model, calibre, and serial number if already known.
  4. Awaiting Approval: It is crucial that you do not take possession of the new firearm until your variation has been officially granted and your certificate updated. Doing so would constitute an offence.

While some forces may process straightforward one-for-one variations relatively quickly, often without a physical visit, processing times can vary.

Key Considerations and Best Practices

Practical Bottom Line

A one-for-one variation offers a practical and often straightforward way for certificate holders to manage their firearm collection, allowing for necessary changes without altering their total authorised count. Always contact your local police firearms licensing department first for their specific guidance and forms. Ensure you understand their requirements and do not acquire a new firearm until the variation is officially granted. Vectis Shooting Log provides the tools to help you maintain impeccable records, simplifying the administrative aspects of your FAC.

Related questions in this topic

Frequently Asked Questions

Can I use a one-for-one variation to swap a rifle for a pistol?

Generally, a one-for-one variation is intended for swapping firearms of the same *type* (e.g., rifle for rifle, pistol for pistol). If you wish to acquire a different *type* of firearm, this would typically require a full variation application where you demonstrate good reason for the new category, rather than a simple one-for-one swap.

Do I have to pay for a one-for-one variation?

No, a one-for-one variation is usually considered an administrative amendment to your existing certificate and does not typically incur a fee. However, it is always best to confirm this with your local police firearms licensing department.

How long does a one-for-one variation take to be processed?

Processing times vary significantly between different police forces and can also depend on the complexity of the request. Many forces can process straightforward one-for-one variations much quicker than new applications, sometimes within days or a few weeks, especially if managed by phone or email. Always check with your local force for their current lead times.

What information do I need to provide for a one-for-one variation?

You will typically need to provide details of the firearm you are removing from your certificate (make, model, calibre, serial number) and details of the firearm you intend to acquire. If you do not yet know the exact new firearm, some forces may grant an "open" variation for a specific type and calibre (e.g., "any .22LR rifle").

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