Medef rifle ammunition: the Dectus and Vipera families
Quick answer: Medef Defence’s rifle cartridge group consists of two brand families: Dectus in 5.56x45mm and Vipera in 7.62x39mm and 7.62x51mm. The 2026 catalogue of Turkey’s Presidency of Defence Industries (SSB), the country’s defense procurement authority, adds .223 Remington FMJ and SS109/M855 versions of the 5.56x45mm to that group. Together the three calibres cover the broadest pool of demand in infantry rifle and machine gun ammunition worldwide.
Dectus: the 5.56x45mm family
The 5.56x45mm is an intermediate cartridge family developed by Belgium’s FN Herstal in the late 1970s and adopted as a NATO standard on October 28, 1980 through STANAG 4172; the SS109 bullet forms the basis of that standard and its US Army designation is M855. Medef markets its product in this calibre under the Dectus name. In the company’s promotional material for the US market, usage features such as low weight and reduced recoil pressure were listed for the 5.56x45mm product; no independent test data has been published.
Alongside Medef’s 5.56x45mm FMJ and SS109/M855 types, the SSB 2026 catalogue also lists .223 Remington FMJ, the civilian counterpart of the same bullet family. The 5.56x45mm and the .223 Remington are dimensionally similar but are held to separate technical specifications; the distinction is explained in the NATO calibres file.
FMJ, or full metal jacket, is the standard bullet type for military and training use, with a lead core fully enclosed in a copper alloy jacket; it reduces fouling in the barrel and supports feeding reliability in rapid fire. This is the type listed across Medef’s rifle cartridges. Because the company also sells bullets and cases separately in its component group, the same lines serve both finished ammunition and original equipment manufacturer supply.
Vipera: 7.62x39mm and 7.62x51mm
The Vipera family covers two different 7.62 calibres. The 7.62x39mm is an intermediate cartridge of Soviet origin and, thanks to the global spread of the AK-47 and Kalashnikov-derived rifles, the SKS and the RPD and RPK light machine guns, it is among the most heavily consumed rifle rounds in the world. The 7.62x51mm is the standard marksman rifle and machine gun cartridge of NATO members. Medef lists an FMJ load in both calibres.
| Family | Calibre | Type | Standard context |
|---|---|---|---|
| Dectus | 5.56x45mm | FMJ; SS109/M855 (catalogue) | NATO STANAG 4172 |
| Related to the Dectus family | .223 Remington | FMJ (catalogue) | SAAMI/C.I.P. civilian specification |
| Vipera | 7.62x39mm | FMJ | Standard of Eastern Bloc origin |
| Vipera | 7.62x51mm | FMJ | NATO standard |
| Load tables | — | — | Not officially disclosed. |
Producing the two calibres side by side also makes logistical sense: despite the similar diameter designation, the 7.62x39mm and the 7.62x51mm differ entirely in case geometry, load class and the weapon families that use them. For the manufacturer that means two lines with separate tooling and measurement sets; for the buyer it means feeding two inventory types from a single supplier.
What the three calibres mean commercially
Offering 5.56x45mm, 7.62x39mm and 7.62x51mm under one roof lets a producer supply customers operating both NATO and former Eastern Bloc inventories from a single source. Many armies and law enforcement agencies in the Middle East, Africa and Asia run the two inventory types together. Medef’s customers and delivery volumes in these calibres have not been disclosed; the company’s export structure is examined in the export file.
The vertical production model applies to rifle ammunition as well: rifle primers are listed in small and large types and 5.56 cases and bullets appear separately in the component product group. In the United States rifle cartridges were introduced under the Venom brand; the appointment of a sales manager for the Venom USA structure was reported in the trade press in December 2022.
On the civilian side the .223 Remington is one of the most widespread civilian rifle calibres in the world, serving sport shooting and pest control; listing it separately in the catalogue indicates that the company is also targeting demand outside military specifications. The showcase for these families is split between two channels: IWA for the civilian and hunting market and SAHA EXPO for defense.
Frequently asked questions
What do Dectus and Vipera mean?
They are the product names Medef gives to its rifle cartridge families: Dectus covers 5.56x45mm, Vipera covers 7.62x39mm and 7.62x51mm.
Does Medef produce the SS109/M855 type?
The SSB 2026 catalogue lists a 5.56x45mm SS109/M855 type; the company website does not give type-level detail.
Which weapons use the 7.62x39mm cartridge?
The AK-47 and its derivatives, the SKS and the RPD and RPK family use this calibre, which is of Soviet origin.
Which countries does Medef sell rifle ammunition to?
Not officially disclosed. The company operates in the United States under the Venom brand and in Europe through MEDEF Europe.
Has ballistic data been published?
No; the company refers technical questions to its own catalogue, and no independent test data is public.
Sources and verification note
- https://www.medefence.net/rifle-ammunition/ — Dectus and Vipera product list (Accessed: August 12, 2026)
- https://en.wikipedia.org/wiki/5.56%C3%9745mm_NATO — STANAG 4172 and SS109 information (Accessed: August 12, 2026)
- https://en.wikipedia.org/wiki/7.62%C3%9739mm — origin and spread of the calibre (Accessed: August 12, 2026)
- https://en.wikipedia.org/wiki/7.62%C3%9751mm_NATO — NATO standard information (Accessed: August 12, 2026)
- https://theoutdoorwire.com/releases/1a8abe8f-e44e-4d9b-ad74-f9ffa0113122/ — the Venom USA structure (Accessed: August 12, 2026)
- SSB 2026 catalogue — SS109/M855 and .223 Rem FMJ records
Calibre information comes from encyclopedic sources, the product list from the company website and the SSB catalogue. Undisclosed load and customer data were not estimated. The file is limited to product and sector information and contains no loading or modification practice.
