The HK21E, or its box magazine-fed variants, is often used in conjunction with or in place of a sniper rifle for precision long-range engagements across the full target spectrum. Its capabilities allow it to be used to engage single personnel targets, to accurately mark targets for other weapons, to disable vehicles or equipment, or for any task where the capabilities of putting.
The HK21E can easily accomplish this task and, unlike the fully automatic fire from a conventional machine gun, without creating the liability of rounds that miss the intended target and could cause unwanted collateral damage to surrounding personnel or materials.
Even firing belted military ball ammunition using iron sights HK21Es regularly will shoot sub-MOA groups at almost any range. Three-shot groups measuring. This level of accuracy opens the door for the users of the HK21E to engage pinpoint targets with accurate, effective semi-automatic fire precluding the need to waste precious ammunition in the sustained fire mode.
This capability is available only in the HK21E and is one that is being used every day by military and law enforcement units around the world. The HK design takes the simplicity and ease of the barrel exchange to new heights of simplicity. To change the barrel of the HK21E the bolt is locked open, the barrel release lever depressed with the thumb and the barrel rotated 35 degrees and removed rearward from the weapon using only one hand.
This procedure can be easily accomplished even after firing 1, rounds, as the well-insulated barrel handle precludes the need for an asbestos glove, as with many other machine gun designs. A special insulated spare barrel carrier is offered for the HK machine guns that allows a scalding hot barrel slung across the shoulder to be safely carried by a member of the gun crew. The layout of the HK21E allows the gunner the means to easily change the barrel with one hand, in the prone without the need to break out of the firing position or expose himself unnecessarily to unwelcome enemy observation or fire.
There is no bipod, gas system, carrying handle or front sight attached to the barrel. This well thought out and executed arrangement simplifies and speeds barrel changes from all firing positions and all but eliminates any change in zero of the weapon from barrel to barrel.
Without a gas system and its required gas port, the structural integrity of the cold hammer forged HK21E barrel is not compromised.
Anyone who has attempted to change a hot barrel on an M60 from a prone position when firing off the bipod can attest to the complexity of this procedure. Lift and hold the gun off of the bipod to free the barrel, disengage the barrel latch, don your asbestos glove, remove the hot barrel remember not to lay the hot barrel on the spare barrel bag or it will melt through the bag , insert the new barrel and align the gas piston, fully seat the barrel in the receiver and hold it in place while you engage the barrel latch.
None of this is required with the HK21E. The HK21E provides the operator with a forward assist for silent loading or to help chamber a round due to improper loading procedure, such as riding the cocking lever forward. The receiver of the HK21E has a guaranteed 60, round minimum service life. Barrels regularly withstand the firing of 40, rounds or more with no sign of accuracy degradation, even after being abused by long bursts of uninterrupted automatic fire.
The HK21E provides a cook-off rate in excess of 1, rounds cyclic , a fact proven by extensive testing, despite some claims that this is impossible from a closed-bolt design like the HK21E. Removable belt boxes can be used to hold rounds of 7. Special belt starter tabs allow the weapon to be loaded with the bolt open or closed and with the belt feed unit locked in the normal firing position. A quick drag of the belt through the unique ratchet drive wheel arrangement of the HK21Es belt feed unit using the belt starter tab places the belt in the position for loading.
Retracting and releasing the cocking lever chambers the first round and prepares the weapon for firing. The weapon is of a closed-bolt design and is delayed blow-back operated using the classic HK roller-locked bolt to delay the opening of the breech.
With the fluted chamber common in many HK weapons, the cartridge case actually pushes itself from the chamber, insuring positive extraction and ejection even under the most inhospitable environmental conditions. In most gas-operated machine guns the empty cartridge case is pulled from the chamber by the bolt as it is driven rearward by the gas system. Should the extractor or extractor spring of the gas-operated machine gun fail, the spent case may well remain in the weapon causing a stoppage.
Unlike gas-operated machine guns such as the FN MAG58 in the HK21E there is no need for a gas regulator to adjust the gas flow into the system to account for sluggish operation due to fouling in the weapon. In fact there is no gas system in the HK21E at all to be maintained. The cyclic rate of fire of the HK21E decreases in cadence to rounds per minute when the weapon is converted to anyone of the box magazine-fed variants.
The HK21E is unique in its modular approach. Each of the assembly groups of the weapon can be removed in seconds by the operator without tools. Damaged or unserviceable assembly groups can simply be exchanged by the operator with a new one and fixed by an armorer when the opportunity allows, without having to pull the complete weapon out of service. Like all HK weapons, the HK21E is simple and quick to field strip and reassemble and requires no tools to accomplish this.
The removable assembly group construction and accessibility to the breech area in the HK21E receiver makes for quick and easy cleaning.
The rear sight offers external knobs for elevation and windage adjustment to ranges matching the 1, meter maximum effective range of the weapon. The rear sight provides a means to zero the weapon independent of the external adjustment knob settings using a simple Philips head screwdriver. The HK Export model machine guns have a well thought out quick-detachable sight mounting system that provides percent return-to-zero capability for all types of targeting devices including telescopic and reflex sights and visible or IR laser aimers.
This system is used on HK sniper rifles and provides sub-minute of angle accuracy, even from the HK21E. It allows various types of targeting devices to be interchanged on the weapon with the assurance that the zero will remain unaffected even after repeated mounting and dismounting.
Another important feature of the rifle was the inclusion of a three-round burst setting alongside semi and fully automatic. The G41 could mount a standard G3 bayonet, fit an M16 bipod and had a flash hider designed to enable it to fire NATO standard rifle grenades.
The 40mm HK79 under barrel grenade launcher could also be mounted to all variants of the G41, simply swapping it out for the polymer forend. The G41 came in a number of variants with designations A1 to A3. The base rifle had a fixed buttstock and its rifling had 1 turn in 7 inches with a right-hand twist, in a There was also a shortened G41K model which had a collapsing stock and a 15 inch barrel available with both rifling types. One of the main issues with the G41 was its weight.
Despite efforts to lighten the sheet metal receiver, it weighed more than its predecessor the HK According to measurement data compiled by researcher Nathaniel F, unloaded the G41 weighs in at 4. A contemporary M16A2 weighed 3.
The rifle eventually adopted by the Bundeswehr, the HK G36, weighed 3. Another potential issue may have been reliability with the move to the STANAG magazine rather than the optimised proprietary HK magazines may have introduced some issues. Sweden began to look for a 5. Italy sought to replace the BM59 with a more modern rifle and HK entered into an agreement with Luigi Franchi which saw them offer both the original HK configuration and the develop their own, slightly modified version, the Franchi mod.
The highest quality steel is used in this unique manufacturing process producing a barrel that provides superior accuracy with minimal degradation of accuracy and muzzle velocity. HK variants are available with In addition to the improvements in the baseline weapon, HK has produced corrosion resistant steel and polymer magazines as well as a proprietary buffer system to further enhance functional reliability.
An HK add-on 40 x 46 mm grenade launcher module can also be quickly attached to the rail system without tools. Replies: 21 Last Post: , PM. Replies: 1 Last Post: , PM. Replies: 2 Last Post: , AM. Cetme Armorers kits Replies: 0 Last Post: , PM. How many different Armorers kits? Replies: 5 Last Post: , AM. Bookmarks Bookmarks Digg del.
All times are GMT The time now is PM.
0コメント