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The G3 is a 7.62×51mm NATO battle rifle developed in 1956 by the German armament manufacturer Heckler & Koch GmbH (H&K) in collaboration with the Spanish state-owned design and development agency CETME
The G3A3 (A4) is a selective-fire automatic weapon that employs a roller-delayed blowback operating system. The two-piece bolt assembly consists of a breech (bolt head) and bolt carrier. The bolt is held in battery by two sliding cylindrical rollers that engage locking recesses in the barrel extension. The breech is opened when both rollers are compressed inward against camming surfaces driven by the rearward pressure of the expanding gases upon the bolt head. As the rollers move inward, recoil energy is transferred to the locking piece and bolt carrier which begin to withdraw while the bolt head slowly moves rearward in relation to the bolt carrier. As the bolt carrier clears the rollers, pressure in the bore drops to a safe level, the bolt head is caught by the bolt carrier and moves to the rear as one unit, continuing the operating cycle. The bolt also features an anti-bounce mechanism that prevents the bolt from bouncing off the barrel’s breech surface. The spring-powered claw extractor is also contained inside the bolt while the lever ejector is located inside the trigger housing (actuated by the recoiling bolt)
View Fullscreen| Specifications | |
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| Weight | 4.1 kg (9.04 lb) (G3A3) 4.7 kg (10 lb) (G3A4) 5.54 kg (12.2 lb) with optic (G3SG/1) 4.1 kg (9.0 lb) (G3K) |
| Length | 1,025 mm (40.4 in) (G3A3) 1,025 mm (40.4 in) stock extended / 840 mm (33.1 in) stock collapsed (G3A4) 1,025 mm (40.4 in) (G3SG/1) 895 mm (35.2 in) stock extended / 711 mm (28.0 in) stock collapsed (G3K) |
| Barrel length | 450 mm (17.7 in) 315 mm (12.4 in) (G3K) |
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| Cartridge | 7.62×51mm NATO |
| Action | Roller-delayed blowback |
| Rate of fire | 500–600 rounds/min |
| Muzzle velocity | 800 m/s (2,625 ft/s) |
| Effective firing range | 500 metres (550 yd), 100–400 m sight adjustments |
| Feed system | 20-round detachable box 30-round detachable box and 50-round drum magazine |
| Sights | Rear: rotary diopter; front: hooded post |
