The HK33 was developed by Heckler & Koch, Germany in the late 1960s as a scaled-down version of their G3 battle rifle, and entered production in 1968. It was developed for the then-new 5.56x45 mm cartridge, and while the HK33 was not adopted by the German military, it saw significant use by German police and security units, and was also widely exported and used by the Malaysian, Chilean and Thai armed forces. The HK33 is a selective fire rifle with the usual H&K delayed blowback action. It is available with either a polymer fixed buttstock (HK33A2) or a retractable metal buttstock (HK33A3, HO -4, SS 11, Acc 7, Rcl -2 when folded). Carbine versions of the HK33 that feature shorter barrels (322 mm instead of 390 mm for the HK33) and similar fixed or retractable stocks are also available (HK33KA2 and HK33KA3, respectively). All HK33 variants are available with different trigger units, either with or without the 3-round burst limiter. The proprietary claw-type mount allow telescopic sights to be mounted, full-length HK33s can be equipped with a bayonet or H&K's 40 mm underbarrel grenade launchers HK79A1. Alternatively, rifle grenades can be fired from a combined muzzle compensator/flash suppressor. H&K also produced a 7.62x39 mm variant, the HK32 which did not sell and is no longer in production. The HK53 is a short-barreled, sliding stock version of the HK33 (211 mm) that is marketed as an SMG by H&K (HO -3, SS 10, Acc. 5, Rcl -3 when stock is folded). It is internally similar to the HK33 but cannot fire rifle grenades nor mount underbarrel accessories or bayonets. All HK33 and HK53 variants are equipped with drum-type rear sights and accept the same 25, 30 or 40 round box magazines.




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