A soldier fires a Mk 19 40mm grenade machine gun during gunnery. U.S. Army photo by Daryl Averill / DVIDS, public domain. Illustrative of the 40mm grenade nature under contract, not the specific ST Engineering rounds procured.

ST Engineering Wins UK MoD 40mm Grenade Ammunition Contract Worth GBP 65.84 Million

Technical Summary

ST Engineering Advanced Material Engineering (AME) has won a five-year contract to supply the British armed forces with 40mm grenades, valued at 65.84 million pounds sterling (about 87.8 million United States dollars), under a contract award notice published by Defence Equipment and Support (DE&S) on the Find a Tender service, reference 059801-2026. The award decision was taken on 20 March 2026, the contract was set to be signed on 7 July 2026, and it runs through July 2031, with a Ministry of Defence option to buy additional munitions across the period. The open contracting record describes the requirement as a competition for the supply of nine variants of 40mm high and low velocity grenades, run under the Procurement Act 2023 competitive flexible procedure. DE&S assessed three tenderers; ST Engineering, the Singapore-based prime, beat the United Kingdom bidders NIOA Nominees Pty Ltd and Ian Edgar (Liverpool) Ltd, trading as Edgar Brothers. The contracting entity is ST Engineering Advanced Material Engineering Pte. Ltd. of 249 Jalan Boon Lay, Singapore (Public Procurement Organisation Number PQCZ-9481-QGTD), and the Find a Tender record classes it as not a small or medium-sized enterprise.

The contract covers nine variants of 40mm high and low velocity grenades. Low velocity natures are the 40x46mm family fired from shoulder-fired and under-slung launchers, in United Kingdom service the L123 Under-slung Grenade Launcher based on the Heckler and Koch AG36. High velocity natures are the 40x53mm family fired from the L134A1 Grenade Machine Gun, the Heckler and Koch automatic grenade launcher in United Kingdom service. ST Engineering markets a broad 40mm portfolio including high-explosive and high-explosive dual-purpose rounds, an Air Bursting Munition System, airburst dual-purpose ammunition, a high velocity counter-unmanned-aerial-system nature, and target-practice, marker, and tracer training rounds. The award notice does not state which of these natures, or what split of natures, the Ministry of Defence has bought.

Nine variants of 40mm high and low velocity grenades, across a five-year framework worth 65.84 million pounds, with a Ministry of Defence option to buy more. ISC reading of Find a Tender notice 059801-2026

Analysis of Effects

40mm grenade natures are compact but technically dense ordnance. A low velocity 40x46mm high-explosive round leaves the muzzle at roughly 76 metres per second and is effective to about 150 metres point and 350 metres area, while a high velocity 40x53mm round leaves the muzzle at roughly 240 metres per second and reaches out past 1,500 metres. High-explosive dual-purpose natures add a shaped-charge liner that will defeat on the order of 50 millimetres of rolled homogeneous armour while still throwing a useful fragmentation pattern, making one nature effective against both light vehicles and personnel. Airburst natures use a programmable electronic time or proximity fuze so the round functions above a target in defilade, a capability that also underpins the counter-unmanned-aerial-system role ST Engineering advertises.

The fuzing is where the safety and effectiveness of these natures is decided. Service 40mm high-explosive grenades typically use a point-detonating, spin-armed fuze with a self-destruct feature: setback on firing and the spin imparted by the rifled barrel arm the fuze at a safe distance, and a pyrotechnic or mechanical self-destruct element functions any round that fails to strike, reducing the unexploded ordnance burden. That the United Kingdom is buying nine variants under one framework, rather than a single high-explosive nature, points to a full training-to-warshot suite covering high-explosive, dual-purpose, airburst, and inert practice rounds for both the L123 and the L134A1.

Personnel and Safety Considerations

40mm high-explosive natures carry a small Net Explosive Quantity per round, on the order of tens of grams of high-explosive fill, but bulk storage of a five-year buy aggregates that into a significant explosive inventory governed by Defence Safety Authority Ordnance, Munitions and Explosives regulation (DSA 03.OME) and NATO storage principles (AASTP-1, Edition C). Filled 40mm grenades are typically assigned Hazard Division 1.2 for the projection hazard, with Compatibility Group depending on whether rounds are packaged with or without their means of initiation; the exact Hazard Division and Compatibility Group follow the packaged configuration and are not stated in the award notice. From an Explosive Ordnance Disposal standpoint the principal field hazard is the dud round: a 40mm grenade that has armed but failed to function is fuze-sensitive and must be treated as a live item, which is precisely why self-destruct fuzing is a specified feature of modern natures.

Data Gaps

The award notice does not identify the nine specific 40mm variants procured, the quantity of each, the split between high velocity and low velocity, or the balance of warshot to training natures. Net Explosive Quantity per nature, the fuze designations, the explosive fill compositions, and the Hazard Division and Compatibility Group per packaging configuration are not stated and are assessed here from open literature. The value and duration are firm from the Find a Tender notice; the manufacturing site and delivery cadence are not disclosed. On the procurement itself, the open contracting record confirms the value, the award decision date of 20 March 2026, the competitive flexible procedure and the three named tenderers, but it does not publish the Most Advantageous Tender criteria or their weightings, the reasons the two United Kingdom bidders were unsuccessful, the specific product NIOA offered, or the contractual role of the supporting representative, and it does not record whether a NATO Ammunition Support Partnership route was considered.

Procurement and Regulatory Context

The award runs under the Procurement Act 2023 (PA23), which replaced the Defence and Security Public Contracts Regulations 2011 for all new United Kingdom procurements from 24 February 2025. Because defence and security contracts sit outside the World Trade Organization Government Procurement Agreement (WTO GPA) and the United Kingdom's free-trade procurement chapters, DE&S had discretion either to restrict this competition to United Kingdom suppliers or to admit international bidders. It ran the Procurement Act 2023 competitive flexible procedure with an international field, and awarded on the Most Advantageous Tender (MAT) basis, which weighs quality, delivery and security of supply alongside price rather than defaulting to the lowest bid or to a domestic preference. Nothing in the regime required a British winner, and nationality is not a permitted stand-alone award criterion. The award is therefore lawful. The question it raises is not legality but industrial strategy.

The bid was supported by GTDS Inc, a Canadian small-calibre defence-trade firm that acts as a manufacturer's sales representative internationally; the contracting party remains ST Engineering. Using a third-country representative to bid foreign defence work is routine and lawful, and the material legal exposure it creates, under the failure-to-prevent-bribery provisions of the Bribery Act 2010, runs to the supplier rather than to the buyer. There is no indication of impropriety here. The point of note is the shape of the field.

The bidders who were not there

DE&S assessed three tenderers: ST Engineering, and the United Kingdom bidders NIOA Nominees Pty Ltd and Ian Edgar (Liverpool) Ltd, trading as Edgar Brothers. The two firms most observers would expect to anchor a European 40mm competition were absent from the result. Rheinmetall is a leading 40mm producer across low, medium and high velocity natures and is already deeply embedded in United Kingdom defence through Rheinmetall BAE Systems Land and a new gun-barrel facility at Telford, yet its interests in this market run through NIOA, its partner in the Rheinmetall NIOA Munitions joint venture. Nammo of Norway, the other front-rank European 40mm house, is also absent. When both leading allied original equipment manufacturers (OEMs) sit out and the field is mostly distributors, the likeliest read is commercial: a mature, price-competitive consumable that premium OEMs judged they could not win on cost, against a low-cost prime that could.

The NATO route that was available

There was also a multinational option that was not taken. The United Kingdom is a participating nation in the NATO Support and Procurement Agency (NSPA) Ammunition Support Partnership (ASP), the thirty-year mechanism through which member nations aggregate demand into framework contracts, drive unit cost down and sustain allied production capacity. NSPA procurement is normally restricted to firms in NATO member nations, and the ASP can restrict competition to NATO industry by design, so routing the buy through it would by default have kept the work inside the Alliance and excluded a non-member prime. Use of the ASP is a national choice rather than a default obligation, and for a nationally qualified requirement the pooling benefit is smaller than it is for a common round such as 155mm. But the mechanism existed, it was the obvious tool for an allied-industrial outcome, and it was not used.

Security of supply and national resilience

The technical credibility of the product is not in question; ST Engineering is a first-rate munitions house and the natures will perform. Sovereign credibility is a different measure. For a war consumable expended in bulk, a five-year sole dependence on a source roughly ten thousand kilometres away, resupplied through the Malacca and Red Sea chokepoints that come under pressure in exactly the scenarios that consume 40mm at scale, is a brittle supply chain. Singapore is a long-standing and reliable United Kingdom partner through the Five Power Defence Arrangements, but it is not a treaty ally, it carries no obligation to prioritise United Kingdom needs, and it maintains a deliberate strategic-hedging posture. The award also sustains no part of the United Kingdom industrial base at a moment when the Defence Industrial Strategy 2025 is committing about six billion pounds and at least six new energetics and munitions factories to reduce precisely this kind of foreign dependence. Bought at lowest unit cost, the round is a rational peacetime purchase. As sovereign resilience for a consumable that a contested first week of war would burn through it provides very little, and pairing the buy with a domestic or allied surge capability is the gap that policy will have to close.

Corrections & updates welcome. If you hold open-source data that refines or corrects any parameter in this article, please contact [email protected] citing the specific claim and your source. Verified corrections will be incorporated and credited in the revision history. AI-assisted technical assessment based on open-source material. Not a formal intelligence product.