Info Aci
accelerator tips fig 22 , Raise the rear of the bolt and continue to push the bolt forward until the bolt latch engages the notches In the top of the receiver. Not . The barrel extension, barrel buffer, and bolt groups may he assembled and returned to the receiver together fig 2S . d. Bolt Stud. Aline the stud hole in the bolt with the clearance hole and replace the bolt stud, insuring that the shoulder of the stud is inside the sideplate. e. Driving Spring Group. Press up on the bolt latch and...
Chapter Antiaircraft Gunnery
Section I. ENGAGEMENT AND EMPLOYMENT a. Individual caliber .50 machineguns can provide unit with a self-defense capability against hostile low-flying, low-performance aircraft. These guns are employed in the air defense AD role as part of the unit's local defense. The machine-guns are not components of an integrated and coordinated AD system. Normally, the following rules for engagement apply 1 Attack aircraft identified as hostile. lt 2 Attack aircraft committing amp hostile act. b. Unless...
Base Of Cartrioge Entering Tslot
Figure 92. Feeding cartridge entering tke T-slot in the bolt. the trigger pin, so that the trigger cam on the inside of the backplate engages, and raises, the rear end of the trigger lever, which, in turn, pivots on the trigger lever pin assembly, causing the front end of the trigger lever to press down on the top of the sear stud. The sear is forced down until the hooked notch of the firing pin extension is disengaged from the sear notch. The firing pin and firing pin extension are driven...
Chapter Operation And Functioning
Operation includes loading or unloading the gun, clearing the gun, or allowing the bolt to go forward. 14. Half-Loading and Loading the Gun a. To half-load the gun, the gunner insures the bolt is forward and the cover is closed. The assistant gunner inserts the double loop end of the ammunition belt in the feedway until the first round is engaged by the belt holding pawl. The gunner grasps the retracting slide handle with the right hand, palm up, and vigorously jerks the bolt to the rear and...
Application Of Fire
must be distributed over the entire target area. Improper distribution of fire results in gaps which allow the enemy to escape or use weapons against friendly positions without effective opposition. The method of applying fire to a target is generally the same for either a single gun or a pair of guns. . Engaging Ground Targets. There are five main factors that govern employment against ground targets. 1 Greater accuracy when fired single-shot. 4 Any number of guns may be operating together at...
Info Sui
1 During instruction in headspace and timing adjustment, use a caliber .50 machinegun and a headspace and timing gage for demonstration and practical work. 2 A large wooden operating model of a headspace and timing gage should be obtained for use in demonstration. S Fllmstrips and training films covering headspace and timing adjustment give clearer understanding of the subject. b. Organization. Organize the cIbbs as explained in paragraph 176 amp . 1 Stress the importance of correct head-space...
Belt Holding Pawl 1
Figure 90. Feeding belt feed elide moving utif the cover, with the belt feed pawl behind the flret round. too soon and catching in the breech lock recess in the bolt. After the bolt travels forward about 5 inches, the lower rear projection of the bolt strikes the tips of the accelerator, turning the accelerator forward. This unlocks the barrel extension from the barrel buffer body group and releases the barrel buffer spring. The barrel buffer spring expands, forcing the piston rod forward. b....
Legend 1
Figure lii. Military symbol applicable to th caliber 0 mavhinegun. is recorded on the sketch for security reasons ftff 146 . k. Obtain data to target areas. 1 When a final protective line is assigned, determine the maximum extent of grazing fire on this line, then draw a solid line in extension to the basic symbol for the machinegun. This line ends in an arrowhead. Sketch a shaded blade on the inside of the final protective line to represent the extent of grazing fire. If the final protective...
Info Rcg
93. Laying the Gun for Direction . Direction AUnement Method. An observer places himself on the gun-target line, and in a position from which he can see the gun and the target. He alines the gun, approximately, by having the gunner shift the mount. The gunner then loosens the traversing slide lock lever and, directed by the observer, moves the gun right or left until it is alined on the target then clamps it in that position. . Use of an Aiming Point. A prominent landmark, visible to the gunner...
Shoulders
ruptured cartridge case extractor j cal. 50 4933 -7 160041 ' - ' vt- - . w Figure 110. Caliber .50 ruptured cartridge case extractor. ruptured cartridge case extractor j cal. 50 4933 -7 160041 ' - ' vt- - . w Figure 110. Caliber .50 ruptured cartridge case extractor. Figure 111. Ruptured cartridge case extractor alined with the chamber. Figure 111. Ruptured cartridge case extractor alined with the chamber. remove the ruptured case and extractor fig 110 2 Always check headspace and timing after...
M2 Browning Cover Top Plate
Figure 61. Removing the cover extractor spring. Figure 6 . Replacing the cover latch spring. Figure 6 . Replacing the cover latch spring. 2. Slowly release pressure, and remove the belt feed pawl and arm fig 58 . 3. Disengage the belt feed pawl arm from the belt feed pawl fig 59 . U- Remove the belt feed pawl spring, e Cover latch spring. Pry the hooked end of the spring out of its groove in the cover, and shift it to the left until it rests on the cover extractor spring. Press down on the...
L Wbb
Figure SI. Inserting the headspace gage. Figure SI. Inserting the headspace gage. insert the NO GO end of the gage if it does not enter correct headspace is set. Remember, to unscrew the barrel, or to screw the barrel into the barrel extension, the lug on the barrel locking spring must be alined with the -inch hole in the right side plate para lb. . 6 If the NO GO end of the gage enters the T-slot, headspace is too loose. The barrel must be screwed into the barrel extension one click at a time...
Cartridge Stop Assembly 1
Figure 7U- Cartridge stop assembly, front cartridge stop, and belt holding pawl pin. Figure 75. Removing the trigger lever pin assembly old type . Figure 75. Removing the trigger lever pin assembly old type . Figure 76. Removing the trigger lever pin assembly new type . Figure 76. Removing the trigger lever pin assembly new type . Figure 77. Trigger lever present design , and trigger lever pin assemblies. Ffeur 7S. Trigger lever replaced rear view . Ffeur 7S. Trigger lever replaced rear view ....
Info Dwx
b. Tripod Mount, MS. Leave the pintle on the tripod by removing the pintle bolt from the gun. Use the barrel as a sledge. Strike the sides of the pintle and deform it. Fold the trail legs and turn the mount over. Stand on the folded trail legs and knock off the pintle latch pintle lock release cam . Smash the elevating mechanism with the barrel. If possible, smash the rear legs to prevent unfolding. c. Antiaircraft Mount, MBS. Remove the side-plate trigger control mechanism from its container,...
Appendix H Aerial Target Engagement
In engaging aerial targets, there are two requirements that must be considered Line and Lead. Lead is the compensation made for the speed of the aircraft and the projectile that will allow the two to intersect at a given point The required lead for a given aircraft is always calculated as a certain number of lengths of that aircraft. A high performance aircraft will require a greater lead factor because of its high speed than a low performance, slower, aircraft. Line is the requirement that the...
Chapter Mounts
a. The two principal ground mounts used with the caliber .60 machinegun are the tripod mount, MS, and the antiaircraft mount, M68. The tripod mount, MS, is a ground mount designed for use against ground targets. The antiaircraft mount, M6S, is a ground mount principally designed for use against aerial targets. Its use against ground targets is limited because the mount tends to be unstable when the gun is flred at low angles. b. The three principal vehicular mounts used with the caliber .50...
Chapter Crew Training
a. The purpose of crew drill is to develop precision, speed, skill, and teamwork in the techniques of examination of equipment, placing the gun into and taking it out of action. In crew drill, precision must be stressed. Once that is attained, speed, skill, and teamwork will be developed. b. Duties are rotated during crew drill to allow each member of the gun crew to become familiar with the duties of the other members. lt . Precision is attained only through adherence to prescribed procedure....
Appendix F Telescopic Sights
At the present time, there is no definite telescopic sight designed for exclusive use with the Browning machinegun, caliber .60 HB, M2. However, the telescopic sight M86C can be adopted for use with this caliber .60 machinegun by adjusting the sight reticle. Any direct fire sight that can be adapted to fit in the dovetailed slot on top of the receiver, and can be adjusted for range, is suitable for use with this caliber ,60 machinegun, A telescopic sight is primarily used when the machinegun 1b...
A Qo A
Figure lit. Applying tk 1 OO-mlUr writ of m a ur method for nsnget gnaUr than 600 v t rt. 1 Training should be conducted to familiarize the soldier with the appearance of other familiar objects, such as weapons and vehicles, at various range . 2 Factors which affect the appearance of objects must be considered, and an understanding of these factors will help to make estimates more accurate. Tabl 1. Factor Affecting Rangt jBiKtmUfcm by Eye Tabl 1. Factor Affecting Rangt jBiKtmUfcm by Eye Atom...
Breech Lock 1
Figure 48. Barrel extension group with old type breech look. Fi'iwre 50. 5re cA iocfc old type to be used with the sear stop and pin. Figure 51. Breech lock new type to be used with the accelerator stop and lock. Figure 51. Breech lock new type to be used with the accelerator stop and lock.
Antiaircraft Gunnery
Engagement end Requirements for a Tracer
Info Jsd
Fiff n 146. Ranp art vit th final proUeUw fine. Fiff n 146. Ranp art vit th final proUeUw fine. where it occurs. Record the ranges to the near and far edges of the dead space and to the maximum extent of graze along the final protective line. Deadspace roust be accurately recorded and sent to higher headquarters so that it may be covered by the fires of other weapons. Record the elevation reading and other pertinent data under appropriate columns in the data section fig 146 . 2 Select the...
Barrel Buffer Body Spring Lock Ecv
Figure i gt 6. Removing the barrel buffer tube lock assembly. REAR WINGED PART BARREL BUFFER TUBE LOCK LATCH Figure i7. Replacing the barrel buffer tube lock assembly. may have a large slot fig 51 . Guns currently manufactured have the breech lock with the slot on top, for use with the accelerator stop and lock. When the accelerator stop and lock replaces the sear stop and pin, the breech lock with slot will be used. b Barrel locki ig spring. The barrel locking spring should already be staked...
Breech Lock Pin 1
Figure 97. Unlocking breech lock being forced out of its The spring is locked in the compressed position by the claws of the accelerator, which engage the shoulders of the barrel extension shank fig 101 . . After its initial travel of three-fourths of an inch, the bolt travels an additional 6 inches to the rear, after it is unlocked from the barrel and barrel extension, for a total of 7i s inches. During this movement, the driving springs are compressed. The rearward movement of the bolt is...