The Zastava M77 B1 is a

battle rifle A battle rifle is a service rifle chambered to fire a fully powered cartridge. The term "battle rifle" is a retronym created largely out of a need to better differentiate the intermediate cartridge, intermediate-powered assault rifles (e.g. the S ...

developed and manufactured by

Zastava Arms Zastava Arms ( sr-Cyrl-Latn, Застава oружје, Zastava oružje) is a Serbian manufacturer of firearms and artillery, based in Kragujevac, Serbia. It was founded in 1853 when it cast its first cannon. It is the leading producer of firear ...

Serbia Serbia (, ; Serbian language, Serbian: , , ), officially the Republic of Serbia (Serbian language, Serbian: , , ), is a landlocked country in Southeast Europe, Southeastern and Central Europe, situated at the crossroads of the Pannonian Bas ...

(formerly

Yugoslavia Yugoslavia (; sh-Latn-Cyrl, separator=" / ", Jugoslavija, Југославија ; sl, Jugoslavija ; mk, Југославија ;; rup, Iugoslavia; hu, Jugoszlávia; rue, label=Pannonian Rusyn, Югославия, translit=Juhoslavija ...

). It was introduced in 1977. It is a derivative of the

Zastava M70 The Zastava M70 ( sr-Cyrl, Застава М70) is a 7.62x39mm assault rifle. Developed in Yugoslavia by Zastava Arms during the 1960s, the M70 was an unlicensed derivative of the Soviet AK-47 (specifically the Type 3 variant). It became the st ...

and modified copy of the Soviet

AKM The AKM () is an assault rifle designed by Soviet small arms designer Mikhail Kalashnikov in 1959. It is the most ubiquitous rifle of the Kalashnikov rifles. It was developed as a replacement to the AK-47 introduced a decade prior. Introduced ...

chambered in 7.62×51mm with an enlarged receiver, and a Western-style flash suppressor. It is gas-operated, air-cooled, magazine-fed, selective fire battle rifle with a fixed wooden stock. The M77 AB1 has a folding stock. Early versions had a milled receiver and an adjustable gas block with flip up rifle grenade sights. The M77PS, a semiautomatic variant of this rifle was imported by

Century Arms Century International Arms is an importer and manufacturer of firearms that is based in the United States. The company was founded in 1961 in St. Albans, Vermont, with offices in Montreal. In 1995, the company headquarters and sales staff moved to ...

into the U.S. in 2014 and 2015, chambered in .308/7.62x51 NATO. It has a polymer thumbhole stock and a 10rd magazine. The receiver is a heavy 1.5mm RPK type with a bulged front trunnion and an optics rail. The barrel is of medium profile and not chrome lined. The bolt and bolt carrier are polished. It came with a muzzle nut and threaded in M14-1.0LH. It was sold by several distributors for about $550, and increased in price over time, due to its rarity. The rifle can be converted back to its original military configuration by changing the polymer furniture to wood and adding a pistol grip. The rear of the receiver has a proprietary slant cut making it necessary for the wood stock to be modified or the use of an adapter plate for proper fitting. One of the unique features of this rifle is that it has an adjustable gas system with 3 settings, aiding suppressor use.

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It is known in Serbian as ''Automatska puška M77 B1'' (М77 Б1). Formerly, it was designated M77B1 (М77Б1), or ''Automatska puška M.1977B1''. It is sometimes confused with the similar

Zastava M77 The Zastava M77 is a 7.62x51mm light machine gun developed and manufactured by Zastava Arms. It is a Kalashnikov pattern rifle Overview The Zastava M77 rifle chambers and fires the 7.62×51mm NATO round. It is gas-operated, air-cooled, magazin ...

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* * 7.62×51mm NATO battle rifles Zastava Arms Rifles of Serbia Kalashnikov derivatives {{Rifle-stub