Heckler & Koch SR9

Heckler & Koch SR9
HK SR9T rifle
Type	Sporting and Target Rifle
Place of origin	West Germany
Production history
Designer	Heckler & Koch, Inc.
Designed	1990
Manufacturer	Heckler & Koch, Inc.
Produced	1990 - Present
Variants	SR9 TC and SR9 T
Specifications
Weight	10.9 pounds (4.95 kg)(Empty magazine)
Length	42.5 inches (1,080 mm)
Barrel length	19.7 inches (500 mm)
Height	8.26 inches (210 mm)
Cartridge	7.62×51mm NATO
Action	roller-delayed blowback
Rate of fire	Semi-automatic
Feed system	5-round or 20-round double column, detachable box magazine
Sights	Protected post front, rotating diopter sight rear adj. for wind. and elev.

The Heckler and Koch SR9 is a series of hunting and target rifles derived from the Heckler & Koch HK91 incorporating parts from the PSG1 and MSG-90 marksman rifles.

The SR9s are modified HK91-series rifles intended to qualify for import as sporting rifles after the US ban on imported "assault weapons" in 1989. The visible differences include the removal of the flash suppressor, bayonet lugs, and pistol grip (on the base model) in order to improve the design's acceptance as a sporting rifle. The SR9s have a medium weight barrel that is slightly less than 20".

Internal differences include a new buffer system and a change to polygonal rifling.

All SR9s are marked "Made in W-Germany" on the right side of the receiver. SR9s imported after September 1994 were sold with a 5-round magazine because of the US Federal ban on magazines that could accept more than 10 rounds.

The SR9-series rifles have unreinforced receivers fitted with iron sights and a semiautomatic-only trigger group. The safety is thumb operated on the left side of the receiver with an indicator marked "0" (in white) for safe and "1" (in red) for fire on both sides. The cocking handle is forward on the left, as in the rest of the G3 family, and folds flat. The magazine release is push button only from the right side of the receiver.

The forearm is a sure-grip style new to this model which precludes the attachment of a bipod. It is, however, replaceable with standard HK91 furniture. The barrel has the same bore profile as the PSG1, including polygonal rifling, and lacks a muzzle device. The basic SR9 is fitted with a reinforced fiberglass thumbhole stock containing an MSG90 buffer.

The 1989 Import Ban, enacted by President George H. W. Bush, bans from importation all semi-automatic rifles with a folding or telescoping stock, separate pistol grip, bipod, ability to accept a bayonet, grenade launcher, night sights, or flash suppressor. The HK91, HK93 and HK94 models were all on the import ban list. At the time of the ban, about 130 or so HK91s had already been delivered to the U.S. but had not yet cleared customs. H&K complied with the ban by renaming those HK91s as HK911 (basically stamping another "1" after the name) and adding a Bell-Carlson thumbhole stock. H&K was also required to put a spot weld over the end cap detent because the ATF considered the hole to be a bayonet lug. This prevented addition of the bayonet. The HK911 did have the standard HK91 threaded barrel but this was covered by a pinned thread hider/cover.

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Wikipedia