Saurer 4K 4FA The Saurer 4K 4FA is an Austrian armoured personnel carrier with caterpillar tracks . It was later replaced by the Steyr 4K 7FA G 127 . It went into production in 1961 . In 1956 , Osterreichische Saurer - Werke of Vienna ( which was taken over by Steyr - Daimler - Puch AG in 1970 ) started development of an armoured personnel carrier . The first prototype , the 3K 3H , was completed in 1958 and the second , the 4K 3H , the following year . They are both powered by a Saurer 3H 200 hp diesel engine . The next model , the 4K 2P , had a different hull layout , a new torsion bar suspension and was powered by a 250 hp Saurer 2P diesel engine . In appearance it was similar to the first production vehicles which were completed in 1961 and designated 4K 4F . Later production vehicles were the 4K 3FA ( 230 hp ) and the 4K 4FA ( 250 hp ) , which differed only in minor details such as their Sauer engines . A total of 445 production vehicles was delivered to the Austrian Army in the following versions : 30 4K 4F , 211 4K 3FA , 38 4K 3FA - FS , 12 4K 4FA - Fü / FIA , 15 4K 4FA - San , 76 4K 4FA - G2 , 60 4K 4FA FüA 1 to 4 series , three 4K 3FA Fül and a number of 4K 3FA GrW1 81 mm mortar carriers which were conversions of earlier vehicles . Production was finally completed in 1969 . The vehicle was succeeded in production by a new model , described in detail in a separate entry , called the 4K 7FA which uses the same automotive components as the SK 105 light tank also manufactured by Steyr - Daimler - Puch , which is covered in detail in a separate entry . Production of the 4K FA and SK 105 are complete and all marketing of these has ceased . In mid - 1999 , the Austrian MoD awarded Steyr - Daimler - Puch a contract for the supply of 112 Ulan infantry fighting vehicles for the Austrian Army . These were delivered from 2002 to 2004 and has now replaced at least part of the current Saurer 4K 4FA APC fleet of the Austrian Army . The 4K 4FA series will remain in service with Austria for some time . Description . The hull of the Saurer 4K 4FA series armoured personnel carrier is made of all - welded steel armour and is immune to penetration from 20 mm armour - piercing projectiles over its frontal arc . The driver sits at the front of the hull on the left side with the power pack to his right and has a two - piece hatch cover that opens to the left and right , in front of which are three day periscopes . The centre periscope can be replaced by a passive periscope for driving at night . The gunner sits behind the driver and on the basic model has a cupola with a two - piece hatch cover opening left and right and a single day observation periscope . A standard . 50 ( 12 . 7 mm ) M2 Browning machine gun is mounted on the forward part of the cupola and most vehicles are fitted with a shield to give limited frontal protection to the gunner . This model is known under the company designation of the 4K 4FA - G1 with its Austrian Army designation being the usMGSPz ( Schützenpanzer / Überschweres MG ) . The personnel compartment is at the rear of the hull with the eight infantrymen seated on bench seats , four down each side of the hull . The crew in the rear face inwards . The section leader is the first on the right seat and is provided with a day periscope in the forward part of the personnel compartment roof , on the right side . Access to the personnel compartment is by two doors in the rear of the hull . Two hatches over the roof of the vehicle open to the outside . Mounting sockets for the pivot trunnion of an adaptor mount for the MG 42 machine gun are provided on the front , right , left and rear side of the hatch above the personnel compartment . The suspension is of the torsion bar type with either side consisting of five dual road wheels with the drive sprocket at the front , the idler at the rear and two track - return rollers . The first and last road wheel stations are provided with a hydraulic shock - absorber . The 4K 4FA has no NBC system , night vision equipment or amphibious capability . Variants . 4K 4FA - G2 ( Grenadier - Schützenpanzer ) This is similar to the basic 4K 4FA - G1 but is fitted with an Oerlikon Contraves GAD - AOA one - person turret which is armed with a 20 mm Oerlikon Contraves cannon Model 204 GK . This is belt - fed and can be used in both the ground and anti - aircraft roles . The weapon is provided with 100 rounds of ready use ammunition and the empty cartridge cases and links are ejected outside the turret . The 20 mm cannon has an elevation of + 70° and a depression of - 12° , turret traverse is 360° . Although its company designation is the 4K 4FA - G2 its Austrian Army designation is the MK66SPz Schützenpanzer / Maschinenkanone 66 . 4K 4FA - San ( Ambulance ) Full designation is 4K 4FA - San ( Sanitätspanzer ) . This model is unarmed and has a crew of two , the driver and the medical orderly , and it can carry four sitting and two stretcher patients . The stretchers are carried in the left side of the hull with the four sitting patients on the bench seat down the right side of the hull , strapped in with waist and shoulder straps . 4K 4F GrW1 81 mm Mortar Carrier ( Granatwerfer - SPz ) Mounted in the rear of the troop compartment , firing forwards , is an 81 mm mortar . A 120 mm self - propelled mortar was developed to the prototype stage ( GrW2 ) but never entered service . The vehicle is armed with an 8 . 1 cm mGrW 82 ( Mittelschwere Granatwerfer 82 ) . Minimum range of the mortar is 180 m with maximum range being 5 , 850 m , normal rate of fire is 6 rounds per minute with maximum rate of fire being 18 to 25 rounds per minute . 81 mm Multiple Rocket Launcher This is the basic APC with an Oerlikon Contraves 81 mm rocket launcher mounted on a turntable over the rear troop compartment . It is understood that these vehicles have now been phased out of service . Schützenpanzer A1 / LWT This is the section vehicle for the MBDA Mistral man - portable surface - to - air missile systems in the Pz1FAL batteries . ELBO Leonidas Version of the vehicle used by the Greek Army and the Cypriot National Guard with a few modifications . It is armed with an M2 Browning Machine Gun and powered by a 320 hp engine . It was produced from Greek vehicle manufacturer ELBO from 1981 . ELBO developed an upgrade called Leonidas 2 which entered production in 1986 . All vehicles in Greek service have been upgraded to that standard .