3D‑Printed Firearms and “Exceptional Circumstances”: Sentencing Below the Five‑Year Minimum Must Still Be Guideline‑Anchored

1. Introduction

In R v Chudziak [2026] EWCA Crim 843, the Court of Appeal (Criminal Division) considered an application for leave to appeal sentence following a guilty plea to possession of a prohibited firearm contrary to section 5(1)(aba) Firearms Act 1968. By virtue of section 311 Sentencing Act 2020, the offence ordinarily attracts a mandatory minimum sentence of five years’ imprisonment, unless the sentencing court is satisfied that “exceptional circumstances” relating to the offender or the offence justify not imposing that minimum.

The sentencing judge found exceptional circumstances and imposed 31 months’ imprisonment (with full guilty plea credit) plus a Serious Crime Prevention Order for five years. The applicant nonetheless argued that even that reduced term was manifestly excessive. The Court of Appeal refused leave, holding that the judge’s approach was orthodox: once exceptional circumstances were found, the court still had to impose a sentence “appropriate to the individual case” and remain guided by the relevant guideline structure rather than treating the statutory minimum as an anchor to be discarded.

2. Summary of the Judgment

  • The Court of Appeal accepted that the sentencing judge was entitled to find exceptional circumstances cumulatively (no single factor being exceptional alone), and thereby to sentence below five years.
  • However, finding exceptional circumstances does not mean the guidelines are ignored. The judge correctly remained guided by the relevant offence guideline and imposed a sentence reflecting the gravity of prohibited firearm possession.
  • The applicant’s attempt to treat R v Francis [2019] EWCA Crim 1201 as creating a “ceiling” of three years where exceptional circumstances are found was rejected; Francis was fact-specific and not a guideline case.
  • The Court held the notional post-trial sentence of four years (leading to 31 months after plea credit) was well within the range open given the deliberate creation of a functioning firearm using a 3D printer and the broader public risk posed by such offending.
  • Leave to appeal against sentence was refused.

3. Analysis

3.1 Precedents Cited

R v Francis [2019] EWCA Crim 1201

The applicant relied on R v Francis [2019] EWCA Crim 1201 to argue, in effect, that where exceptional circumstances are found in prohibited firearm cases, sentences should not exceed around three years. The Court of Appeal rejected that reading for two linked reasons:

  • Non-guideline decisions are poor comparators: the court reiterated a familiar appellate principle—unless a prior decision is a guideline case, it is rarely useful to compare outcomes as though they were sentencing tariffs.
  • Francis was materially different on culpability: Francis turned on a defendant’s brief and panic-driven possession of a sawn-off shotgun, discovered unexpectedly and promptly demanded to be removed; the central question there was whether exceptional circumstances should have been found at all.

Importantly, the Court pointed out that Francis itself stated that each case turns on its own facts. The Court also emphasised Francis’s reinforcement of the seriousness of firearm offences because of the risk that weapons may return to circulation among criminals.

3.2 Legal Reasoning

(a) The statutory scheme: section 311 Sentencing Act 2020

The legal hinge was the interaction between: (i) the mandatory minimum (five years) for certain prohibited firearm offences; and (ii) the judicial safety valve of “exceptional circumstances”. The sentencing judge found exceptional circumstances based on a cumulative assessment including: positive previous good character, low risk of reoffending, genuine remorse, significant mental health difficulties (including PTSD-related features and suicidality), and substantial caring responsibilities.

The Court of Appeal did not revisit whether exceptional circumstances were rightly found; instead, it focused on whether the resulting sentence was manifestly excessive or reflected error of principle.

(b) Exceptional circumstances do not abolish guideline discipline

A central point in the judgment is that disapplying the statutory minimum does not “reset” sentencing to an unstructured free-for-all. The Court stressed that:

  • The guideline starting point for the agreed category (Category 3B) remained highly relevant.
  • The guideline already captures certain features (e.g., the absence of actual harm) by placing the case in Category 3.
  • Once exceptional circumstances were found, the court must still impose a sentence that is appropriate to the individual case, which can be a shorter custodial sentence or an alternative sentence, but not one that underplays the offence’s inherent seriousness.

(c) Why immediate custody remained necessary

The applicant argued that insufficient weight was given to the impact of custody (including mental health vulnerabilities). The Court rejected this as inconsistent with the sentencing remarks. A key feature of the reasoning was the judge’s view (endorsed on appeal) about the inherent public risk in manufacturing/possessing prohibited firearms: even if the maker’s intent is not criminally instrumental, such weapons may be diverted, lost, stolen, shared, or otherwise find their way into criminal circulation. The Court treated that systemic risk as a legitimate sentencing consideration.

(d) Culpability and the “3D‑printed” factual matrix

Although there was dispute about whether the applicant intended to fire the weapon, the Crown ultimately accepted any intended firing was limited to confirming functionality. The Court noted this dispute did not materially affect guideline categorisation because, for a type 1 weapon, both medium and lower culpability map to culpability B (within the relevant framework as applied in the case).

The Court also accepted that the weapon, as recovered, was incomplete and required improvised testing; but it remained significant that the applicant deliberately set out to create a working firearm, rather than coming into possession unwittingly. That difference in agency and planning helped justify the judge’s notional post-trial term.

(e) The “starting point” complaint and alleged error of principle

The applicant characterised the judge as using four years as an impermissible “starting point”. The Court clarified:

  • Four years was the judge’s notional sentence after trial, reached after accounting for mitigation (and the absence of aggravating features), not a guideline starting point.
  • The complaint that the judge treated the mandatory minimum as a “flaw” was “fundamentally misconceived”; the judge did disapply the minimum due to exceptional circumstances, then sentenced conventionally.

3.3 Impact

The judgment is likely to be cited for several practical propositions in firearms sentencing, particularly as 3D-printed and hybrid weapons become more common:

  • Guideline anchoring after exceptional circumstances: even where section 311 exceptional circumstances are found, the court should remain guided by the offence guideline and impose a sentence “appropriate to the case”, not an artificially low figure driven by comparisons with isolated prior decisions.
  • Comparator caution reinforced: the Court reiterates that non-guideline authorities (such as Francis) should not be treated as creating informal “caps” or sentencing tariffs.
  • Systemic risk of circulation is a legitimate sentencing concern: the seriousness of prohibited firearm offences is not limited to immediate intended use; courts may treat the broader danger of proliferation/diversion as aggravating the need for deterrent immediate custody.
  • 3D-printed firearm cases: incomplete or improvised functionality may mitigate at the margins, but where there is deliberate manufacture of a functioning firearm, substantial custody can remain justified even with strong personal mitigation.

4. Complex Concepts Simplified

  • Mandatory minimum (section 311 Sentencing Act 2020): a statutory rule requiring at least five years’ custody for specified firearms offences, unless “exceptional circumstances” justify a lower sentence.
  • Exceptional circumstances: not defined exhaustively; it means circumstances out of the ordinary that make the statutory minimum arbitrary or disproportionate in the particular case. They may be cumulative even if no single feature is exceptional alone.
  • Newton hearing: a fact-finding hearing held after a guilty plea where the parties dispute facts relevant to sentence. Here it was vacated because the disputed issue would not affect the guideline category.
  • Notional sentence after trial: the sentence the judge would have imposed if there had been a conviction after trial, before applying guilty plea reduction.
  • Serious Crime Prevention Order (SCPO): a civil order imposed by a criminal court to restrict a person’s activities (for a fixed period) to prevent or disrupt involvement in serious crime.

5. Conclusion

R v Chudziak [2026] EWCA Crim 843 confirms that when exceptional circumstances justify departure from the five-year mandatory minimum for prohibited firearm possession, sentencing remains firmly structured by the relevant guideline and the public protection rationale underpinning firearms legislation. The Court of Appeal rejected attempts to derive informal sentencing “ceilings” from fact-specific prior decisions such as R v Francis [2019] EWCA Crim 1201, and it endorsed a robust approach to the inherent risks posed by the deliberate creation of firearms—including 3D-printed weapons—because of their potential to enter criminal circulation. The decision illustrates both the reach of exceptional circumstances (as a genuine safety valve) and their limits (not a licence for undue leniency).