wz. 1960	wz. 1960/72
Maker:	Z.M. Lucznik, Radom, Poland*
Caliber:	7.62 mm x 39
Action type:	Gas operated
Capacity:	10**, 30
Length:	1075 mm (42.3")
Barrel length:	415 mm (16.3")
Sight radius:	660 mm (26")
Weight (empty):	4.65 kg (10.25 lb)	4.85 kg (10.7 lb)
Muzzle velocity (carbine):	710 m/s (2330 ft/s)
Muzzle velocity (grenade):	54 - 90.5 m/s (177 - 296 ft/s)***
Rate of fire (carbine):	600 rpm
Practical rate of fire w. grenades:	2 rpm
* no longer manufactured
** 10 rounds magazines are used for launching grenades
*** depending on type of grenade used

 
Kbkg wz. 1960 (carbine - grenade launcher model 1960) was designed in late fifties. In seventies the weapon was modified slightly (wz. 1960/72 with detachable stock).

 
Kbkg wz. 1960 is a minor modification of the Soviet AK-74 rifle. Modifications were done to the gas block, mainspring rod and to the stock. Additionally, several new components were added to the weapon: muzzle attachment, rubber butt plate, grenade sights and a short, 10 rounds magazine. The gas block features a gas valve. It has two positions: O (otwarty - open) used for normal rifle fire and Z (zamkniety - closed) used when launching grenades. Valve in Z position allows only a small amount of gasses to move through, just enough for the action to cycle. The mainspring rod was modified: a spring-loaded catch was added at the rear end to prevent the bolt cover from falling off when firing grenades. The stock features two metal plates with slots for attaching the rubber butt plate.

The barrel attachment screws on the treaded muzzle and has to be tightened with a key. A flat spring is located at the top of the tube. Its purpose is to hold the grenade in place before it's fired. Normally, the grenade launching tube is only used when launching grenade but normal bullet fire can be conducted without detaching it.

Two types of grenade sights were used. The early type was screwed on to the rifles rear sights and had three positions (50, 75 and 100 meters). The later type (CN-70 - celownik nasadkowy wz. 1970), introduced in 1970-ties, was attached to the front sight. When firing rifle ammunition the usual 30 rounds steel magazine fed the weapon. When firing grenade a special, 10-rounds magazine was used. The magazine was fitted with a filler block to prevent any live round being chambered. Grenades are fired with a special blank cartridge: UNM wz. 1943/60 (Uniwersalny Naboj Miotajacy - Universal Launching Cartridge model 1943/60). Externally, the round is identical to a blank but has stronger charge. The tip of the cartridge is painted white for easy identification.

To fire grenades the weapon had to be unloaded to ensure that no live round were present in the chamber (there is a high chance of grenade detonating on the muzzle if a bullet is fired). Than the gas valve had to be turned into Z position, rubber butt plate attached and the barrel attachment screwed on the muzzle. Grenade sight had to be mounted, 10 round magazine attached and the propelling round chambered. Finally, the grenade can be placed on the muzzle attachment and fired.

Several types of grenades were developed:

 
wz. 1960: Base version with fixed wooden stock. A version with metal folding stock was also developed but not manufactured.
wz. 1960/72: Version with detachable stock.

 
Wz. 1960 and wz. 1960/72 were used by the Polish military.