MR762A1 LRP LONG RIFLE PACKAGE OPERATOR’S MANUAL Covering MR762A1 7.
SAFETY PRECAUTIONS CAUTION: Read these safety rules before handling the firearm! Read this operators manual before handling your firearm. The following safety rules are placed in this manual by HK as an important reminder that firearms safety is your responsibility. If handled improperly firearms can be dangerous and can potentially cause damage to property, serious injury, or death. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17.
TABLE OF CONTENTS Safety Precautions...................................................... Inside Cover Clearing.........................................................................................5 Section 1 Introduction...................................................................................6 Section 2 Nomenclature and Description ....................................................7 Section 3 Function and Operation .............................................................
SECTION 1 — INTRODUCTION SECTION 2 — MR762A1 nomenclature & Description The thirty caliber (7.62 x 51 mm) counterpart of the 5.56 mm MR556A1, the MR762A1 also traces its lineage to the select fire HK416/HK417 model line. The MR762A1 is a semi-automatic rifle developed by Heckler & Koch as a premium level commercial/civilian firearm with match rifle capability. Like the entire line of HK416/HK417/MR556A1 long guns, the MR762A1 is a major product improvement over conventional AR-type carbines and rifles.
7. Trigger – When activated by the operator, initiates the firing sequence. Located inside the lower receiver, the trigger when squeezed with the firearm loaded and off “safe” will fire the gun, “SEMI-AUTOMATIC” will fire one round each time the trigger is pulled. The MR762A1 uses a proprietary HK two-stage trigger for optimal accuracy. 8. Trigger Guard – The trigger guard protects the trigger.
Chamber – The chamber is the area where the cartridge is seated and the initial phase of firing occurs. Assembly groups Bolt and Carrier Assembly – Provides stripping, chambering, locking, firing, extraction, and ejection of the cartridges using the recoil spring and projectile propellant gases for power. These parts are made of the highest quality steel. Bolt – The bolt locking lugs rotate and lock the barrel and bolt together prior to cartridge ignition.
Section 3 — Function and Operation The function and operation of the MR762A1 is similar to that found in semi-automatic firearms and consists of eights steps: (1) Feeding, (2) Chambering, (3) Locking, (4) Firing, (5) Unlocking, (6) Extracting, (7) Ejecting, and (8) Cocking. These eight steps are explained below with a brief description of what occurs inside the rifle during each step.
Section 4 — Sights, sight adjustment, and aiming MR762A1 rifles can accommodate a wide variety of optical and mechanical (iron) sights. For models with HK Diopter rotary sight sets, the sights are installed on the MIL-STD1913 (Picatinny) rail with a Phillips #2 screwdriver or the HK sight tool (Fig. 5 & 6). Do not over tighten the screws. Fig. 8 – Clamping Screw (to tighten turn clockwise) Fig. 5 – Front Diopter Sight Fig.
Section 5 — Ammunition By using ammunition with match bullets or other match grade ammunition the MR762A1 will achieve the best level of accuracy. Use ammunition of the appropriate caliber and of recent manufacture. The MR762A1 is chambered for 7.62 x 51 mm ammunition and will functioned safely and reliably with most high quality 7.62 x 51 mm and Caliber .308 Winchester ammunition. NOTE: Use only high quality 7.62 x 51 mm NATO or Caliber .308 Winchester ammunition in the MR762A1 rifle.
SECTION 6 — Instructions for use LOADING A MAGAZINE NOTE: The magazine may be loaded into the weapon with the bolt assembly open or closed. The procedure listed below is for the bolt open. LOADING Magazines may be loaded by hand, one round at a time, or quickly loaded using a magazine loader. Loading a magazine by hand is depicted below (Fig. 15). Filling the magazine 1. Hold the magazine with one hand.
Confirm the weapon is clear and on SAFE before performing the following procedures. Failure to follow these warnings may cause injury or death to personnel. CAUTION: Never ride the charging handle forward. Allow it to move forward under its own power. NOTE: Close the ejection port cover if the weapon is not to be immediately fired. FIRING THE Rifle 1. Place the selector lever on SEMI-AUTOMATIC. 2.
Section 7 — disassembly & Assembly Disassembly (Field Stripping) of the MR762A1 b. Insert the small tip of the disassembly tool into the spring loaded detent located in the center of the rear takedown pin. Push the disassembly tool from left to right until the takedown pin reaches its limit of lateral travel (Fig. 22, 23). Tools Needed: MR762A1 Disassembly Tool (located in the Buttstock), 5mm Allen Wrench 1. Clear the MR762A1 a.
Fig. 28 – Slide the Bolt Head out g. Further disassembly of the bolt head, including removal of the extractor is not recommended (Fig. 29). Fig. 25 – Drift out the Firing Pin Retaining Pin and lift up on the Drop Safety d. Lift up on the spring-loaded drop safety (firing pin safety) and remove the firing pin and firing pin spring (Fig. 25 and Fig. 26). Fig. 29 – Bolt Head Fig. 26 – Removing the Firing Pin and Firing Pin Spring from the Bolt Assembly e.
4. Upper Receiver a. Insert a 5mm hex (Allen) wrench into the retaining screw located on the lower right hand side of the Free Floating Rail System (handguard) and rotate counter clockwise (Fig. 31). Once loosened, drift out the retaining screw from left to right until the retaining screw reaches its limit of lateral travel. WARNING: The retaining screws for the Free Floating Rail System (FFRS) handguard are held captive by small shaped springs located on the lower right hand side of the handguard.
Reassembly (Assembly) of the MR762A1 Tools Needed: MR762A1 Disassembly Tool (located in the Buttstock), 5mm Allen Wrench, Small Straight Slot Screwdriver 1. Lower Receiver: a. Check to ensure that the buttstock tightening screw is loose before attempting to install the buttstock. If tight, insert the large tip (3mm hex) of the MR762A1 Disassembly Tool into the tightening screw and rotate (but do not completely remove) counter clockwise. d.
b. Insert the cam pin into the shaft of the bolt carrier, ensuring that the hole for the firing pin on the cam pin is aligned with the firing pin tunnels on both the bolt head and bolt carrier (Fig. 45). 3. Bolt Assembly: Fig. 42 – Bolt Assembly viewed from bolt face Fig. 45 – Bolt Carrier reassembly c. Ensure that the captive firing pin retaining pin is drifted completely out to the left hand side of the bolt carrier.
Fig. 49 – Installing the bolt assembly into the upper receiver h. Push the charging handle and bolt group completely into the upper receiver until the locking lugs on the bolt head engage the locking on the barrel extension and the latch on the charging handle engages the oval locking surfaces on either the left or right hand sides of the upper receiver (Fig. 50). Fig. 47 – Firing Pin Retaining Pin Installation f.
d. Insert the small tip of the disassembly tool into the spring loaded detent located in the center of the rear pivot pin. While pushing on the disassembly tool, drift the pivot pin from right to left until the pivot pin reaches its limit of lateral travel. The tip of the pivot pin should be visible on the left hand side of the lower receiver (Fig. 52). FUNCTION CHECK WARNING: Always ensure the MR762A1 is unloaded prior to attempting to perform a function check.
Magazine disassembly CAUTION: Parts are under considerable spring pressure. Wear safety goggles and point the base of the magazine housing in a safe direction when disassembling or assembling. Read the complete procedure before attempting to disassemble the magazine. To disassemble the magazine for cleaning or inspection, push in the locking plate button (located in a hole in the magazine floorplate) with a finger, cleaning rod, cartridge, or similarly shaped object.
Section 8 — CLEANING & Maintenance Cleaning of the MR762A1 There are no special requirements, cleaners, or lubricants required for cleaning the MR762A1. The standard HK cleaning kit that is used for all 7.62 mm HK rifles may be used for this firearm. Cleaning may be completed using dry cleaning solvent, bore cleaner, wiping with a cloth or an all-purpose nylon brush. Using these guidelines will determine which applies. Cleaning materials are pipe cleaners, swabs, all-purpose nylon brush and rags.
4. Apply a light coat of lubricant to the exterior of the bolt carrier, outside of the firing pin retaining pin, cam pin, and bolt head. Pay special attention to cam pin area inner and outer surfaces of bolt carrier, anvil, and bolt head’s locking lug. 5. Apply a medium coat of lubricant to the interior and exterior surfaces of the charging handle (Fig. 58). Fig. 60 – MR762A1 Buttstock Assembly Fig. 58 – Lubrication of MR762A1 Charging Handle Lower Receiver assembly 1.
Cleaning may be completed using dry cleaning solvent, bore cleaner, wiping with a cloth or an all purpose nylon brush. Using these guidelines will determine which applies. Cleaning materials are pipe cleaners, swabs, all purpose nylon brush and rags. NOTE: If cleaning is completed using a solvent, then a coat of lubricant must be applied for protection against rust and the elements. Dry cleaning solvent may be used to completely remove lubricants.
Section 9 — Troubleshooting Problems and repair This section contains operator level troubleshooting information for locating and correcting most of the operating troubles which may develop in the MR762A1 Series. Each malfunction for the individual part or assembly is followed by a list of tests or inspections which will help you to determine the corrective actions in the order listed. This manual cannot list all malfunctions that may occur, or all tests or inspections and corrective actions.
SECTION 10 — MR762A1 Long Rifle package The MR762A1-LRP is a standard Heckler & Koch MR762A1 equipped with an essential accessory package to function as an enhanced “long rifle” precision shooting platform. The “Long Rifle” accessory package is shown in the illustration below and include the following: 1. Pelican Model 1720 Long Gun Case with custom foam insert 2. Otis Universal Cleaning kit (FG-85211) 3. HK G28 adjustable buttstock , buffer extension tube, with G28 castle nut 4. A.I.M.
A unique mounting system that secures the cheek piece to a spring loaded locking plate allows the cheek piece to remain stationary in relation to the receiver extension as the entire buttstock is adjusted for length. This feature frees the operator to constantly having to re-adjusting the cheek every time the buttstock is extended or retracted. 5.
a corner off the Picatinny rail and remove the cover. They can be snapped into place over any Picatinny rail surface as per the instructions. The rail covers can be cut to specific lengths as desired. Some of the rail cover products contain wire routing and push pad insert capability for lights and laser devices. For more information, visit www.mantarails.com.
Sling and Adaptor – The MR762A1-LRP is equipped with a simple and state of the art VCAS sling system made by Blue Force Gear. The sling is one of the most under-used aspects of marksmanship to provide proper support and steady the rifle. Fig. 78 a,b,c – Sling hardware installation For target shooter who will be using the sling as a primary means of support then recommend attaching the sling adaptor to the bottom of the rail at the midway point. Fig.
Section 11 — Exploded diagram and parts list (base MR762A1 only) MR762A1 Standard Model depicted, for more information on MR762A1 Long Rifle Package unique parts, contact HK-USA Customer Service.
Parts List (for exploded diagram, pages 42-43) Item Description Part Number MR762 A1 (Item 1 - 101) — Upper receiver, compl. (Item 1 - 19) — Barrel MR762 16.5’’, compl. (Item 1 - 5) 1 Flash hider, compl. 2 Gas block 3 Clamping sleeve for gas block (2x) 4 Barrel nut 5 Barrel MR762 16.5’’, assembled 6 Gas piston, compl. 7 Rod, compl. 8 Upper receiver, assembled 9 Axle for cover 10 Ejection port cover, compl.
Firearm Type ________________ Serial Number ________________ Firearm Type ________________ Serial Number ________________ Number of Cumulative Total Maintenance Date Rounds Fired of Rounds Fired Users Name & Remarks ________________________________________________________________________________ Number of Cumulative Total Maintenance Date Rounds Fired of Rounds Fired Users Name & Remarks ________________________________________________________________________________ ________________________
HK USA-12132013 HECKLER & KOCH Commercial and Law Enforcement 5675 Transport Boulevard Columbus, Georgia 31907 United States of America Tel: (706) 568-1906 Fax: (706) 568-9151 USA Web: www.hk-usa.com HECKLER & KOCH Military and U.S. Government 19980 Highland Vista Drive, S-190 Ashburn, Virginia 20147 United States of America Tel: (703) 450-1900 Fax: (703) 450-8160 USA Web: www.hk-usa.
