Other new features include a red-dot sight, a travel safety catch to allow the M4 to be carried while loaded, an adjustable shoulder rest and forward grip for improved ergonomics, a shot counter to keep track of how many rounds have been fired to manage the weapon's 1, 000-round barrel life, picatinny rails for grips and sight mounts, and a remote round management function so intelligent sights can " talk " to programmable rounds.
22.
Among those variants are the "'SG 551-1P "'police carbine ( designed to engage point targets out to 300 m; equipped with a Hensoldt 6x42 BL telescopic sight and detachable cheek riser ), the "'SG 551 SWAT "'carbine ( coated with a corrosion-resistant finish and equipped with an optical sight mount used with a wide array of sights, and can also accept mission-critical accessories such as a bipod, laser pointer or tactical light ) and the "'SG 551 LB "'carbine with an extended barrel that enables the use of rifle grenades and a bayonet.
23.
Compared to the older HK21A1 and HK11A1, the modernized " Export " weapons feature a longer barrel shroud, extended by towards the front, which also resulted in a longer sight radius; the barrel trunnion was modified ( the HK21E also received a longer barrel ); a burst fire mode was incorporated into the trigger group as the fourth selector setting ( 3-round burst ); a polymer barrel handle was added; the rear sight was modified with an adjustable drum; a bipod with a 3-position height adjustment mechanism replaced the simple folding bipod; the feed mechanism was modified to provide continuous feeding ( by moving the belt in two stages, during both forward and rear movement of the bolt ), a forward assist for silent loading was provided and the machine guns were adapted to use NATO-standard optical sight mounts.
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