Zastava M77 B1

The Zastava M77 B1 is a battle rifle developed and manufactured by Zastava Arms in Serbia (formerly Yugoslavia).[3] It was introduced in 1977.[4] It is a derivative of the Zastava M70[4] and modified copy of the Soviet AKM[1] chambered in 7.62×51mm with an enlarged receiver,[4] 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.

Zastava M77 B1
Zastava M77 B1
Type	Battle rifle
Place of origin	Yugoslavia/Serbia
Service history
In service	1977–present
Wars	Yugoslav Wars
Production history
Designed	1977
Manufacturer	Zastava Arms
Specifications
Mass	4.35 kg
Length	1035 mm
Barrel length	500 mm
Cartridge	7.62×51mm NATO
Action	Gas-actuated (rotating bolt)
Rate of fire	620 rnd/s[1]
Muzzle velocity	840 m/s[2]
Effective firing range	800 m
Feed system	10-, or 20-round detachable box magazine
Sights	Adjustable iron sights, optional mount required for optical sights

The M77PS, a semiautomatic variant of this rifle was imported by Century Arms into the U.S. in 2014 and 2015, chambered in .308/762.51 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.