Heckler & Koch introduced the HK MR308 in 2007 alongside a smaller-caliber sibling, the MR223, itself a semi-automatic civilian version of the Heckler & Koch HK416.² For the American market, HK renamed the same .308 Winchester/7.62x51mm NATO rifle the MR762 starting at the 2009 SHOT Show, a branding split that still confuses first-time buyers comparing the HK MR308 against the MR762 online.³ The core rifle underneath both names is nearly identical, right down to shared upper and lower receiver forgings, differing mainly in serial-number prefix and which chambering label HK prints on the barrel for each market's hunting and sporting regulations.³

The HK MR308 belongs to the wider designated marksman rifle category by mechanical design even though Heckler & Koch markets it purely as a sporting and tactical-pattern rifle, not a fielded designated marksman rifle in its own right. Because HK later used the MR308's accuracy data as the direct basis for the Bundeswehr's Heckler & Koch G28, understanding the civilian HK MR308's design is a prerequisite for understanding how Germany's actual fielded DMR came to exist.² The HK MR308's manufacturer, its Heckler & Koch origin, and its .308 Winchester caliber recur throughout firearms retailer listings and forum discussions asking whether the HK MR308 is still in production, and as of the current A6 generation, it is.⁴

The Short-Stroke Gas Piston Carried Over From the G36

The HK MR308 fires from a semi-automatic, gas-operated action using a short-stroke gas piston, the same basic mechanism Heckler & Koch first developed for the Heckler & Koch G36 and later carried into the HK416 and HK417 family.² A multi-lug rotating bolt locks into an extension machined into the barrel, the same broad AR-10-pattern layout used by the American SR-25 and its military M110 descendants, and the locked breech has a rotating bolt head with 7 locking lugs.¹ The action is semi-automatic only, HK MR308 buyers never had a select-fire option regardless of market, since German export law and most importing countries' civilian statutes forbid it outright.²

Ammunition feeds from a detachable magazine available in 2, 5, 10, or 20-round capacities, though the German domestic market has been legally capped at 10 rounds since a 2020 amendment to German weapons law tightened magazine rules for civilian semi-automatic rifles.⁵ The factory trigger breaks at roughly 25 newtons on early A3-generation rifles, and the HK MR308 A6, HK's newest generation, adds a genuine two-stage match trigger for a lighter, more consistent pull than the standard-generation rifle offered.⁶

Three Barrel Lengths and the A3 Through A6 Generations

The standard HK MR308 A3 ships with a cold-hammer-forged, hard-chrome-lined barrel in one of three lengths, 13, 16.5, or 20 inches, all free-floating inside a Slim Line HKey handguard.¹ The 16.5-inch configuration, the most commonly sold variant, weighs approximately 4.45kg unloaded, runs 905 to 985mm overall depending on stock extension, and carries a 421mm barrel with a 411mm sight radius, figures that shift modestly across the shorter 13-inch and longer 20-inch options.⁸ Rifling twist has varied across production, HK MR308 barrels shipped at a 1 in 12 inch twist for years before quietly moving to a tighter 1 in 11 inch twist on more recent production runs, a change owners have noticed mainly through slightly different heavy-bullet stabilization at long range.⁹

Heckler & Koch has cleared four generations of the HK MR308 for European sale through Germany's BKA firearms authority. The A4 added an adjustable gas block for tuning cyclic behavior with different ammunition, the A5 added an inclined optics rail, and the A6, which debuted publicly at the Enforce Tac trade show, added a side-mounted charging handle, an M-Lok handguard, and the two-stage match trigger mentioned above, alongside a slightly longer 16.75-inch barrel option.⁶ American buyers see the identical upgrades under the MR762A4, MR762A5, and MR762A6 names rather than the European MR308 branding.⁴ A distinct MR308 A3-28 variant borrows components directly from the military G28, including its length-adjustable cheekpiece buttstock and quad-rail handguard, blurring the line between the sporting and precision-marksman versions of the same basic rifle.¹

The barrel is threaded M15x1, making every current-generation HK MR308 suppressor-ready out of the box on markets where that is legal, a detail HK does not always advertise prominently but that shows up consistently in HKPRO owner discussions and in comparisons against threaded-barrel rivals like the SR-25.¹⁰ The receiver set follows HK417 practice, an aluminum-alloy upper and lower, with a polymer buttstock, pistol grip, and an aluminum HKey or M-Lok free-floating handguard depending on generation.¹

A 2007 Commercial Launch Alongside the MR223

Heckler & Koch launched the HK MR308 in 2007, the same year it released the smaller-caliber MR223, deliberately building both as civilian-legal derivatives of rifles it already sold to military and police customers rather than designing new sporting rifles from scratch.² That decision let HK MR308 buyers pay for the same cold-hammer-forged barrels, the same gas-piston reliability, and the same manufacturing tolerances the military HK417 used, at a price still well above an ordinary hunting rifle, US retailers have listed the standard HK MR308/MR762 configuration at roughly $3,999 to $4,799 in recent years.¹¹ Two years later, at the 2009 SHOT Show, Heckler & Koch brought the rifle to the American civilian market under the separate MR762 name, a rebrand driven by US market conventions around calling the cartridge 7.62x51mm NATO rather than the hunting-oriented .308 Winchester label used in Europe.³

From MR308 Accuracy Data to the Bundeswehr's G28

The HK MR308's most consequential legacy is not its own retail sales figures but the rifle it enabled. When Bundeswehr infantry in Afghanistan found their 5.56mm G36 rifles outranged during the war in Afghanistan, Heckler & Koch did not design a new designated marksman rifle from a blank sheet. It took the existing HK MR308, already accuracy-tested and warrantied for the civilian market, and adapted it into the Heckler & Koch G28, warrantying the military rifle to the same 1.5 MOA figure the commercial HK MR308 had already demonstrated.² That relationship makes the HK MR308 a rare case of a civilian sporting rifle's accuracy record feeding directly into a NATO military procurement decision rather than the more usual direction, a military design later being sporterized for civilian sale.

HKPRO's own gun-community discussion threads tracked this transition in near real time around 2011, watching a rifle marketed to hunters and target shooters get quietly turned into a Bundeswehr service weapon within the same product generation.¹² Heckler & Koch's German commercial catalog and its Bundeswehr contract paperwork describe functionally the same short-stroke piston, the same rotating bolt, and largely the same barrel and handguard hardware, with the G28 differing mainly in its steel upper receiver, dedicated optics rail, and formal military accuracy contract rather than in how the rifle actually cycles.²

The HK MR308 itself has no documented combat record. It is a civilian commercial rifle, sold through sporting-goods and law-enforcement-pattern retail channels rather than issued to any armed force, and no source describes an HK MR308 being fired in an active conflict under that name. The rifle's only meaningful conflict connection runs through its military derivative, the Heckler & Koch G28, which German infantry carried during the war in Afghanistan from 2011 onward, using accuracy specifications the HK MR308 had already established on the civilian market.² That distinction matters for anyone researching the HK MR308's history, the rifle that actually saw Afghanistan service is a separate, steel-receiver military variant, not the commercial rifle covered here.

MR308 Versus MR762, the Same Rifle Under Two Names

Because HK MR308 and MR762 are the same rifle marketed under region-specific names, most of the meaningful variation sits inside each generation rather than between the two labels. The A3 is the baseline configuration described above. The A4 adds the adjustable gas block, the A5 adds an inclined top rail for improved optic co-witnessing, and the A6 bundles the side-charging handle, M-Lok handguard, and two-stage trigger into a single current-production package sold as either an HK MR308 A6 in Europe or an MR762A6 in the United States.⁶ HK has also periodically dropped the older direct-impingement-style AR-10 branding entirely from its own marketing, instead describing every generation purely by its piston-driven internals to distance the HK MR308 from cheaper direct-impingement AR-10 clones on the same market.⁴

The MR308 A3-28, a Hybrid Sporting and G28-Pattern Rifle

A separate factory configuration, the MR308 A3-28, splits the difference between the sporting-pattern A3 and the military G28 by fitting genuine G28 components, its longer, cheek-adjustable buttstock and quad-rail handguard, onto an otherwise standard civilian-legal HK MR308 receiver.¹ It is aimed at civilian buyers who want the ergonomics and optics-mounting real estate of the fielded Bundeswehr rifle without the steel receiver or the military contract paperwork, and it illustrates how thoroughly the commercial and military branches of this design still share parts more than fifteen years after the HK MR308's original 2007 launch.

No national armed force has adopted the HK MR308 itself as an issued service rifle. The rifle is sold commercially across the European Union, including Germany, and through separate retail channels in the United States, Canada, and Australia, to civilian sport shooters, hunters, and (in some markets) law-enforcement buyers purchasing through police-pattern retail programs rather than centralized government procurement.¹³ That distinction is worth stating plainly given how often online discussion conflates HK MR308 sales figures with the military operator records of the mechanically related HK417 and G28.

Some European police tactical units have privately or departmentally acquired HK MR308-pattern rifles for designated-marksman or overwatch roles alongside their standard-issue arms, following the same broad market logic that pushed the SR-25 into American SWAT team use, but no single country-level law-enforcement adoption of the HK MR308 by name has been independently confirmed strongly enough to list here as a formal operator. The Bundeswehr's own designated marksman rifle, the related but mechanically distinct G28, is documented separately under its own entry rather than as an HK MR308 service record.

The HK MR308's clearest rival is the American SR-25, and the rivalry comes down to one mechanical choice made decades apart, gas piston against direct impingement. Knight's Armament built the SR-25 around the AR-10's original direct-impingement gas system, venting propellant gas straight into the bolt carrier, while Heckler & Koch designed the HK MR308 around the short-stroke piston it had already proven on the G36 and HK416.² A piston keeps combustion fouling largely out of the action, trading some added mechanical complexity for easier cleaning and better tolerance of sustained fire, exactly the tradeoff that later led the US Army to select the piston-driven HK MR308's own military descendant, the G28, over an SR-25-derived rival for the CSASS competition.

Where the two rifles differ just as sharply is market role rather than mechanism. The SR-25 has always been sold primarily as a semi-automatic sniper-support and law-enforcement precision rifle, with military contracts as its central business case. The HK MR308, by contrast, is Heckler & Koch's civilian sporting and competition-shooting product, its accuracy guarantee exists to sell rifles to hunters and target shooters, and its later military relevance through the G28 was a downstream benefit rather than the original design goal. A buyer comparing the HK MR308 against the SR-25 is really choosing between two different starting approaches to the same .308 Winchester semi-automatic precision-rifle category, HK's piston-driven civilian-first design against Knight's Armament's direct-impingement, military-contract-first design.

Every figure in that table is cited in the sections above. The table exists to make the mechanical and market contrast easy to scan, it does not replace the analysis around it.

How does the HK MR308 work? The HK MR308 is a semi-automatic, gas-operated rifle using a short-stroke piston and a rotating bolt, feeding from a detachable magazine in .308 Winchester, mechanically descended from the military HK417.¹

Is the HK MR308 still in production? Yes. Heckler & Koch continues producing current A6-generation HK MR308 and MR762 rifles as of 2024, with additional new variants reported for 2026.⁶

What is the HK MR308's price? US retailers have listed the standard HK MR308/MR762 configuration at roughly $3,999 to $4,799 in recent years, a premium price reflecting HK's military-grade manufacturing tolerances rather than typical civilian .308 semi-auto pricing.¹¹

What caliber does the HK MR308 use? .308 Winchester in Europe, marketed as 7.62x51mm NATO-compatible for the identical American MR762 rifle, the same core cartridge used by its military relative the G28.³

Is the HK MR308 the same rifle as the HK417 or the G28? No, they are related but distinct. The HK417 is a select-fire battle rifle and the G28 is a military-contract designated marksman rifle, both built for armed forces and police, while the HK MR308 is Heckler & Koch's semi-automatic-only civilian commercial rifle. The G28's accuracy specification was directly derived from HK MR308 testing.²