Hk33 Blank Firing Bolt Assembly

Fig. 14: Barrel with receiver, cocking lever mechanism and sights

Pressed into the right end left sides of the receiver are rails to guide the bolt. In front are the openings for the barrel extension and barrel as well as the cocking lever housing (14/5).

The rear of the receiver is closed by the back plate. The lower rear section of the receiver is box-shaped and has one hole in which is Inserted the locking pin which connects the back plate and the grip assembly to the receiver. In the front of the receiver are the magaime well with magazine release lever and the hole with bush for the grip assembly locking pin. The magazine well receives the magazine In conjunction with the magazine catch (13/15). On the right side of the receiver is the ejection port. The sight base is welded to the receiver.

The extension of the rear sight base serves to locate the telescopic sight mount. On the left and right sides of the receiver are 4 raised areas for engaging the clamping claws of the telescopic sight mount.

Ther cocking lever housing is inserted in the receiver and welded in place. Welded to the front of the cocking lever housing is a U-clamp (14/3) for holding the handguard locking pin.

On the left side of the cocking lever housing is a slot with a recess at the top rear for engaging the cocking lever (13/21). The cocking lever with elbow spring (12/22) and cocking lever support (13/20) slide in the cocking lever housing. The bolt is drawn back by means of the cocking lever, compressing the recoil spring. The support and the cocking lever are limited In front by the stop abutment. The stop abutment is connected to the cocking lever housing by means of a rivet (13/12). This rivet protrudes on the left side as a pin. The cocking lever engages this pin when the bolt snaps forward. The front end of the cocking lever housing is closed by a cap (13/5); a set bolt (13/6) with spring (13/7) holds the cap at place in the front sight holder (13/8).

Barrel

In the barrel, the cartridge is ignited and the bullet is given motion, direction end twist. The interior of the barrel consists of the chamber (15/1) and the rifled section (15/2). In the rifled section are 6 grooves, which have a constant right-hand twist.

The grooves can either be cot, drawn or hammered.

Pig. 15: Barrel

The chamber has 16 flutes, which facilitate the extraction of the cartridge case by means of the gas pressure. The muzzle is threaded (15/5) for screwing on the flash suppressor or blank attachment when these are screwed on. The longitudinal grooves (15/3) milled behind the centering shoulder serve to retain the spring on the flash suppressor or the blank attachment.

Rash Suppressor

Almost all of the powder gases still burning as they leave the muzzle are extinguished by the longitudinal slots (16/1) of the flash suppressor, thus almost entirely reducing the muzzle flash. The suppressor al6o serves as a guide for launching rifle grenades.

The retaining spring (16/2) at the rear engages In the longitudinal grooves at the barrel shoulder and prevents the flash suppressor or blank attachment from working loose. The flash suppressor must be threaded tightly to the barrel.

Fig. 16: Flash suppressor

Sights

The sights are comprised of the fixed front sight in the front sight holder (17/1) and the vertically and horizontally adjustable rotary rear sight (17/2). The rotary rear sight with V-notch and diopter holes can be set in positions 1 to 4. Position *1M is an open V-sight, while positions M2, 3 and 4" are aperture sights. Positions M2, 3 and 4" correspond to ranges of 200, 300 and 400 metres.

Hk33 Sight
Fig. 17: Sights

The front sight holder (18/1) with front sight holder bush (18/2) is inserted over the barrel and soldered in place. In addition, the front 6ight holder is secured to the barrel by means of the eyebolt (18/3). The spring hook on the sling is attached to this eyebolt. The snap ring (18/4) at the front of the front sight holder provides a secure seat for the grenade. The upper section of the front sight holder is designed as a front sight hood. The front sight (18/5) is inserted into a lateral slot and secured by means of a retaining pin (18/6).

Turret Sight

Fig. 18: Front sight holder

The rear scght base (19/1) is welded to the receiver, 8nd the sight cylinder (19/2) is screwed to the sight support (19/3). The two catch bolts (19/4) and catch bolt 6pringo (19/5) are located between the rotating threaded ring in the sight support and the sight cylinder. The ball (19/6) and compression spring (19/7) press against the threaded ring and lock the sight cylinder in the desired sight ad)ustment. The sight support is screwed to the rear sight base by means of fix plate (19/8), lock washer (19/9) and binding screw (19/10). The rear sight is adjusted laterally by means of the adjusting screw (19/11).

Fig. 18: Front sight holder

Fig. 19: Rotary rear sight

1.5.1.2. Bolt Assembly

1

Bolt head carrier

2

Cylindrical pin

3

Locking lever

4

Compression spring

5

Bolt head

6

Extractor spring

7

Extractor

8

Cylindrical pin

9

Holder for locking rollers

10

Locking rollers

11

Locking piece

12

Firing pin spring

13 Firing pin

14 Slide

15 Buffer bolt

16 Brake ring

17 Disc

18 Buffer springs

19 Recoil spring

20 Recoil spring guide rod

21 Recoil spring guide ring

22 Stop pin

23 Rivet

22 21

22 21

Round Firing Pin For Rifle
Fig. 20: Bolt assembly

The bolt assembly is located in the receiver and together with the cartridge case, seals the rear of the chamber when firing. It also feeds and fires the round, extracts and ejects the empty cartridge case and cocks the hammer.

The bolt head carrier (20/1) carries the bolt head (20/5). It has studs on both sides, permitting It to slide in the guide rails of the receiver. Located in its longitudinal bore are the firing pin (20/13) with firing pin spring (20/12) and the locking piece (20/11). The bolt head Is located in the open front of the bolt head carrier. At the top left of the bolt head carrier is the locking lever (20/3) with cllindrical pin (20/2) and compression spring (20/4). The nose of the locking lever engages the bolt head at the moment of locking, preventing the separation of bolt head and bolt head carrier. The buffer assembly (20/15-18) In the bolt head carrier absorbs after firing the remaining energy of the recoiling bolt and brings rt in connection with the recoil spring in front position again.

The recoil spring tube of the bolt head carrier contains the recoil spring (20/19) with recoil spring guide rod (20/20). The bolt head and locking piece are seated in the bolt head carrier and are held at the shoulder of the bolt head by the locking lever. It Is bored and milled to guide the front section of the locking piece, the firing pin and the locking rollers (20/10) with the roller holder (20/9). The bottom of the bolt head is rib-shaped. In it are a longitudinal groove for the ejector 8nd recesses to provide free access to the lips of the magazine. The semi-cir-cular shoulder at the rear limits the longitudinal movement of the inserted bolt head.

The extractor (20/7) is located on the face the bolt heed. It is held elastically by the extractor spring (20/6). It grasps the extractor groove at the base of the cartridge case with its extracting claw.

The locking piece regulates the displacement of the locking rollers thus controlling the locking and unlocking of the bolt head In the barrel extension. Its flattened front section slides in the bolt head; its cylindrical rear section has a cam which holds it In the bolt head carrier. Its longitudinal axle has a bore for guilding the firing pin.

The firing pin ignites the cartridge. It is guided In the bolt head, locking piece and bolt head carrier. Its shoulder serves as an abutment for the firing pin Bpring.

1.5.1.3. Grip Assembly with Trigger and Safety Mechanism

1 Grip

2 Trigger assembly housing

3 Locking pin

4 Safety mechanism

Fig. 21: Grip assembly

Fig. 21: Grip assembly

300 Rifle Trigger Assembly

The grip (21/1) contains the trigger assembly housing (21/2) and io connected to the receiver by means of the locking pin (21/3). The safety pin (21/4) fixes the trigger assembly housing in the grip assembly. On the left side of the grip assembly, the selective fire lever can be set at:

S = safe (white) E = single fire (red) F = burst (red)

A white mark on the face of the safety pin also indicates the position of the selective fire lever from the right side of the grip assembly.

Fire Safe Markings

Fig. 22: Safety mechanism - left side of weapon

Fig. 23: Safety mechanism - right side of weapon

The trigger assembly housing (21/2) contains all components of the trigger mechanism.

Benelli Shotgun Trigger Plate Assembly

Fig. 24: Rigid butt stock

Fig. 24: Rigid butt stock

Butt stock

Back plate

Tubular rivet

Holder for carrying sling

Locking pin

The butt stock with back plate closes the rear of the receiver. It is connected to the receiver by means of one locking pin (24/6).

The butt stock (24/1) aids in handling the rifle and in positioning it against the shooter's shoulder. Recessed in the left side of the butt stock is the sling holder. The tubular rivets (24/3) are used for storing the locking pin while stripping the rifle.

1.5.1.4.2. Retractable Butt Stock

1 Back plate

7

Cover with plug

2 Buffer screw

8

Tension lever

3 Compression bolt

9

Tension spring

4 Compression spring

10

Locking ring

5 Clamping sleeve

11

Catch spring

6 Gripping lever

12

Lock

13

Compression spring

14

Clamping sleeve

1

15

Spring ring

16

Butt stock

17

Locking pin

Retractable Butt
Fig. 25: Retractable butt stock

The „retractable butt stock" is interchangeable with the »rigid butt stock". Seated on the buffer housing of the back plate are the gripping lever (25/6), the tension lever (25/8) and the locking ring (25/10) with which the retractable butt stock is locked in its fully extended and fully retracted positions. They are held by the spring ring (25/15). The cover (25/7) closes the rear of the back plate (25/1). The two guide rails slide on the buffer housing and fit into the guide grooves of the receiver when the butt stock Is mounted.

Located within the buffer closure is a compression bolt (25/3) with compression spring (25/4). It presses the butt stock (25/16) rearwards after unlocking by means of tension lever.

1.5.1.5. Handguard

The plastic handguard (26/1) encircles the barrel from below. It makes the rifle easier to handle when the barrel is hot. A sheet metal lining is riveted to the inside as a thermal shield. A holder (26/2) has been riveted to the handguard for the hook-in of the combat carrying sling. The handguard is attached to the rifle with the locking pin (26/3).

Fig. 26: Handguard

1.5.1.6. 20-Round Magazine

1 Magazine housing

2 Follower

3 Follower spring with safety plate

4 Floor plate

The magazine holds and feeds the cartridge. It is a 20-round magazine.

Hk33 Magazines

Fig. 27: 20-round magazine

Available In edition to the magazine (27) is a 40-round magazine (28).

Fig. 28: 40-round magazine

1.5.1.7.1. Telescopic Sight with Mount

The- telescopic sight is used for employing the Rifle HK33 as a sniper rifle. It enables the shooter to locate the target and aim by day or at dusk. The maximum distance which can be ranged Is 600 metres. It can also be used for observing the enemy at greater distances.

The telescopic sight (29/1) is attached to the mount (29/2) by two screws (29/3). The HK33 receiver is so designed that the telescopic sight with mount can be placed on any rifle without modifications. The telescopic sight mount is marked the corresponding serial number of the rifle.

Hk33 Scoped

Fig. 29: Telescopic sight with mount

Fig. 29: Telescopic sight with mount

1.5.1.7.2. Infrared Scope with Mount

The infrared scope is designed for use with the Rifle HK33 for aiming and observing at night with the infrared spotlight.

In night operations, it enables the shooter to observe and aim by means of infrared illumination and the infrared spotlight.

The infrared scope (30/1) is attached tc the telescopic sight mount (30/2) by means of two screws (30/3).

The HK33 receiver is so designed that the infrared scope with mount can be placed on any rifle without modifications. The telescopic sight mount is marked with the corresponding serial number of the rifle.

""a

Infrared Spotlight Gun Mounted
Fig. 30: Infrared scope with mount

1.518 Training Equipment 1.51.81. Blank Attachment

1 Blank attachment 4 Nozzle boit

2 Retaining spring 5 Cup springs

3 Cylindrical pin

Typical Wound From Blank Ammunition

Fig. 31: Blank attachment

Fig. 31: Blank attachment

The blank attachment (31/1) is a training device for firing 5.56 mm x 45 blank ammunition. It is screwed onto the barrel in place of the flash suppressor. The retaining spring (31/2) in the rear engages in the longitudinal grooves of the barrel shoulder and secures the blank attachment against working loose. Located in the front of the blank attachment are the nozzle bolt (31/4) and cup ßprings (31/5), held in place by the cylindrical pin (31/3). The gas pressure can be regulated by rotating the nozzle bolt.

The blank attachment must be threaded tightly to the barrel. To distinguish it from the flash suppressor, the blank attachment has a dull chrome finish.

1.5.1.8.2. Subcalibre Conversion Kit for .22 LR (5.6 mm x 16) Ammunition

4 Container

Hk33 Imahes

Fig. 32: Subcalibre conversion kit for .22 LR (5.6 mm x 16) ammunition

Fig. 32: Subcalibre conversion kit for .22 LR (5.6 mm x 16) ammunition

The subcalibre conversion kit is a training device for firing .22 LR (5.6 mm x 16) ammunition.

1 Subcalibre tube .22 Cal.

2 Locking ring A Milled planes 5 Lateral slit

1 Subcalibre tube .22 Cal.

2 Locking ring A Milled planes 5 Lateral slit

Subcalibre M16

Fig. 33; Subcalibre conversion tube. .22 Cal. (5.6 mm)

Fig. 33; Subcalibre conversion tube. .22 Cal. (5.6 mm)

The .22 Cal. (5.6 mm) subcalibre tube (33/1) is placed into the chamber of the Rifle HK33. The locking ring (33/2) prevents loosening from the barrel extension when the bolt is open and the magazine removed. The parallel milled planes (33/3) on the enlarged rear end of the tube fix it in the proper position within the barrel extension. The extractor fits in the lateral slit (33/4). The tube interior is divided into a chamber and a rifled section.

The bolt head fits in the bolt head carrier and together with the cartridge case, seal6 the rear of the chamber when firing. It also feeds and fires the round, extracts and ejects the empty cartridge case and cocks the hammer.

1 Guide rod

2 Bolt head carrier

3 Bolt head with extractor

4 Recoil spring

5 Guide sleeve

6 Washer

7 Buffer spring

8 Safety plate

9 Recoil spring with recoil spring tube

Hk33 Bolt Carrier

YiWMVYmYrrrrrrii Fig. 34: Bolt assembly, .22 Cal. (.56 mm)

Located In the bolt head carrier (34/2) is the bolt with extractor (34/3). which l6 connected to the guide sleeve (34/5). Located on the guide rod (34/1) are the recoil spring (34/4) with washer (34/6), buffer spring (34/7) and safety plate (34/8). The bolt head carrier and the bolt head move only when the rifle is being cocked; when firing, however, only the bolt head recoils.

1 Bolt head

2 Extractor

3 Shock absorber

4 Firing pin

5 Firing pin spring

6 Spring

7 Limit stop

8 U-clip

9 Guide plate

Trigger Assembly Drawing

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    How to field strip hk33 bolt?
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