Jantar
5.56 mm Carbine Model 2005 Jantar (5,56 mm karabinek wz. 2005 Jantar) is a Polish prototype assault rifle designed as element of a master's thesis by Michal Binek of Military Technical Academy (Wojskowa Akademia Techniczna). Jantar design is based on Polish Carbine Mod. 90 (a.k.a. Tantaloberyl), which was a 5.56x45 mm caliber version of karabinek wz. 88 "Tantal". Jantar was designed under the program to study construction technology and ballistic characteristics of bullpup style small arms. One of the program's objectives was the assessment of feasibility of developing modern weapons based on AK assault rifle and its versions. Jantar was a third bullpup construction designed in Military Technical Academy. The other two were Carbine Mod. 97 BOŻ designed by Jacek Bożejko, and Carbine Mod. 2002 BIN (based on kbs wz. 96 Beryl) designed also by Jantar's designer Michał Binek. All those designs were prototypes only.
5,56mm karabinek wz. 2005 Jantar
5.56 mm Carbine Mod. 2005 Jantar is a gas operated weapon with long stroke gas piston and the gas tube located above the barrel. The gun has a standard AK style rotating bolt with two lugs. The slide and bolt are interchangeable with components from Carbine Mod. 90. The AK style safety lever is located on the right side of receiver. In safe mode the safety lever locks the trigger, the slide, and the bolt. Position of safe mode is marked as "Z" standing for Polish word "Zabezpieczony". Fire mode position is marked as "O" standing for Polish word "Odbezpieczony". On the left side of the receiver straight above the pistol grip, there is a 3-position switch marked with "P", "C", "S". The letters stand for single shot ("P"=Pojedynczy), full automatic ("C"=Ciagly), and 3 rounds burst ("S"=Seria). Ejection port and cocking handle are located on the right side of the receiver. The gun has firing mechanism with internal hammer. Carbine Mod. 2005 Jantar is chambered for 5.56x45 mm cartridge. Both M193 and SS109 could be utilized. The weapon is fed from 20 or 30-round double column curved plastic magazine. (The same as in Carbine Mod. 90 and Mod. 96 Beryl). Magazine catch is located under receiver between magazine well and the stock. The receiver is made from stamped steel with its front extension made from aluminium. Plastic pistol grip and a "new" trigger are located under receiver extension, which also houses sear leading from "new" trigger to the rear trigger located inside receiver. The chrome plated barrel is 457 mm lonf with 4 grooves having right hand twist. The muzzle is terminated with a flash suppressor/muzzle brake device, which could accept 6H4 bayonet or blank firing adaptor. Rear of the receiver is terminated with a wooden stock and a steel buttstock. The stock is in-line with a barrel bore, which greatly reduces the muzzle rise during full automatic fire. Carbine Mod. 2005 Jantar has a fixed Picatinny rail mounted between the gas port and rear sight locations. Iron sight, optical sight, red dot or night vision sight could be mounted on Picatinny rail.
5,56mm karabinek wz. 2005 Jantar-M
5,56mm karabinek wz. 2005 Jantar-M
5.56 mm Carbine Model 2005 Jantar-M is a modified version of Jantar. Weapon's rear portion of the receiver is modified and is sporting adjustable aluminium stock with a rubber buttstock. The distance from buttstock to the pistol grip was greatly reduced, which resulted in weight savings. Other components are not modified.
Jantar summary
5.56 mm Carbine Mod. 2005 Jantar was developed as a case study for master's thesis, and was neither intended for mass production, nor as replacement for Beryl carbine. Jantar is a reliable gun featuring in-line stock and fixed Picatinny rail, which does not have to be removed for field stripping. (Rear feature in AK style rifles). On the other hand Jantar is not as ergonomical as Beryl, which has its own ergonomical flaws. Safety lever is difficult to operate, there is no slide-open catch, and the magazine is not easy to remove. Based on study of construction and ballistics it was shown, that designing a new assault rifle based on AK platform is not practical, therefore new Polish non AK style assault rifle was designed under Modular Small Arms System 5.56 mm Program. (Modułowy System Broni Strzeleckiej 5,56 mm).
version
kbk wz. 97 BOŻ
kbk wz. 2002 BIN
kbk wz. 2005 Jantar
kbk wz. 2005 Jantar-M
cartridge
7.62x39mm
5.56x45mm
5.56x45mm
5.56x45mm
muzzle velocity
740m/s
920m/s
920m/s
920m/s
muzzle energy
2160J
1695J
1695J
1695J
barrel lenght
520mm
457mm
457mm
457mm
lenght
1001mm
760mm
750mm
743mm
weight
3.7kg without
magazine

4.3kg with full load
30rd magazine
3.6kg without
magazine

4.2kg with full load
30rd magazine
3.32kg without
magazine

3.92 with full load 30rd
magazine
3.2kg without
magazine

3.8kg with full load
30rd magazine
fire selector
single and full auto
single, full auto and
3rd burst
single, full auto and
3rd burst
single, full auto and
3rd burst
rate of fire
800 rpm
700 rpm
700 rpm
700 rpm