RK 71
Finnish stamped-receiver assault rifle tested as RK 62 replacement.
The RK 71 (also sold commercially as the M71) is a Finnish assault rifle built by Valmet. It is a development of the RK 62, which itself traces its lineage to the Soviet AK-47. The Finnish Defence Forces (FDF) evaluated the 7.62 mm RK 71 from 1971 to 1973, considering it as a potential successor to the RK 62. However, logistical concerns prevented the FDF from adopting it in large numbers. The rifle did see export, notably to Qatar.
Development began in the early 1960s, when both Valmet and the FDF were debating the merits of milled versus stamped receivers and open versus aperture sights. In 1962, the FDF and Valmet produced a stamped-receiver prototype called the RK X, intended for cheaper, faster wartime production. It shared the RK 62’s action but had a different receiver layout. A 1966 agreement led to further development, and a 1967 prototype based on the RK X incorporated features from the Spanish CETME rifle, such as the charging handle location. The FDF rejected this design, and in 1968 issued more specific requirements for a stamped-receiver rifle that more closely resembled the RK 62’s layout. Four configurations were requested, with a fifth to be designed based on lessons from the first four.
The fifth prototype arrived in 1969. After minor sight adjustments, the FDF ordered 100 prototypes for field trials: 90 with fixed tubular stocks (similar to the RK 62) and 10 with folding stocks. These were completed in June 1971, but delivery to the FDF was delayed until October 1971 because the tritium night-sight inserts were not yet approved. During the trials, the folding stocks on some rifles began to wobble from wear. Valmet designed a stronger locking system for these versions in 1973, but it was never installed, and the prototypes were eventually placed in storage.
In 1974, the FDF’s Infantry Weapons Technical Department designed a sniper variant called the TAK, chambered in the Finnish 7.62×53mmR cartridge. It used 20-round Lahti-Saloranta magazines and had a long, thin 725 mm barrel that retained the front sight and flash hider. To strengthen the stamped receiver, a rib was welded, pinned, and riveted to the outside of the left wall, which also served as the mount for the optical sight. Despite this reinforcement, the rifle suffered from poor accuracy due to its light barrel and structural compromises.
Quick Facts
- Origin
- Finland
- Is Ranged
- Yes
- Used By
- Users
- Designer
- Valmet
- Design Date
- 1966–1971
- Production Date
- 1970–1976
- Variants
- RK 71 / RK 71 TP / M71/S / M72 / TAK
- Weight
- 3.5 kg empty
- Length
- 928 mm (RK 71) / 922 mm stock extended, 680 mm stock folded (RK 71 TP) / 925 mm (M71/S)
- Part Length
- 420 mm (RK 71 and M71/S)
- Cartridge
- 7.62×39mm / .223 Remington/5.56×45mm NATO (M71/S)
- Action
- Gas-operated, rotating bolt
Facts from the source article.
Lore & Background
Development of the RK 71 began in the 1960s as FDF and Valmet explored a stamped receiver alternative to the milled-receiver RK 62. An early prototype, the RK X, was developed in 1962, and by 1966 an agreement was reached to develop a stamped receiver rifle. After several prototype configurations, a series of 100 rifles was produced for field trials in 1971, including fixed and folding stock variants. The folding stock versions developed wobble from wear, and a stronger locking system was manufactured in 1973 but never installed. The prototype series was withdrawn to FDF weapons depots.
In 1974–1975, Valmet designed a 5.56×45mm NATO conversion of the RK 71, sold to civilians as the M71/S. The FDF also designed a sniper prototype called TAK, chambered in 7.62×53mmR, but poor accuracy led to the project being shelved. The receiver is stamped, wider than the RK 62, making trigger group pins and selector switch incompatible with other RK variants, though bolt and bolt carrier are interchangeable. The sight layout differs from the RK 62, with the rear sight moved to the gas tube and the front sight to the muzzle, similar to Soviet AK rifles.
Reader's Guide
The RK 71 represents a significant but ultimately limited chapter in Finnish assault rifle development. It was Valmet's attempt to produce a stamped receiver rifle that could be manufactured more quickly and with less material than the milled RK 62, while retaining the same Kalashnikov-derived action. The FDF tested it extensively between 1971 and 1973, but logistics issues prevented its adoption as a replacement for the RK 62. The rifle's stamped receiver design later influenced the RK 62 76, which used stamping techniques developed for the RK 71. The RK 71 also served as the basis for the Valmet M78 light machine gun, which used a similar sight layout. Export to Qatar's Royal Guard resulted in the chromed M72 variant with walnut furniture. The TAK sniper prototype, though unsuccessful, highlighted the limitations of the stamped receiver for precision roles, a point of dispute between FDF and Valmet. The RK 71's legacy is thus as a transitional design that informed later stamped-receiver Valmet rifles and saw limited but notable service.
Did You Know?
- The RK 71 was tested by the Finnish Defence Forces between 1971 and 1973 as a possible replacement for the RK 62.
- The folding stock variant (RK 71 TP) used an AKS-47 style stock that tended to wobble after use, leading Valmet to design a reinforced locking system in 1973.
- The TAK sniper prototype was chambered in 7.62×53mmR and fed from 20-round Lahti-Saloranta magazines, but suffered from poor accuracy.
- The RK 71's receiver is slightly wider than the RK 62, making its trigger group pins and selector switch incompatible with other RK variants.
More in Assault Rifles, Part 3 1-24
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