1、 MIL-DTL-001298D (AR) w/ AMENDMENT 124 March 2008 MIL-DTL-001298D (AR) 25 October 2007 DETAIL SPECIFICATION GUN, MACHINE; CALIBER .50, BROWNING, M2, HEAVY BARREL This specification is approved for interim use by the U.S. Army Armaments Research, Development and Engineering Center (ARDEC). Other acti
2、vities in the Department of Defense may use this interim revision or may continue using MIL-G-1298A. 1. SCOPE 1.1 Scope. This detail specification prescribes the requirements and identifies the verification procedures for the gun, machine, caliber .50, browning, M2, heavy barrel, hereafter referred
3、to simply as the M2. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. Whil
4、e every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, a
5、nd handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. AMSC N/A FSC 1005 DISTRIBUTION STATEMENT A. Approved for public
6、 release, distribution is unlimited. INCH-POUND Comments, suggestions, or questions on this document should be addressed to Commander ARDEC, ATTN: AMSRD-AAR-QES-E, Picatinny, NJ 07806-5000) or emailed to (ardec-stdznpica.army.mil). Since contact information can change, you may want to verify the cur
7、rency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-001298D(AR) w/AMENDMENT 1 2DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-W-63150 Weapons and Support M
8、aterial, Standard Quality Assurance Provisions for DEPARTMENT OF DEFENSE STANDARDS MIL-STD-130 Identification Marking of US Military Property (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or http:/assist.daps.dla.mil or from the Standardization Document Or
9、der Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issu
10、es of these documents are those cited in the solicitation or contract. ARMY TECHNICAL MANUALS TM 9-1005-213-10 Operators Manual for Machine Guns, caliber .50; M2, Heavy Barrel (This TM may be viewed and printed at https:/www.logsa.army.mil/etms/online.htm.) U.S. ARMY ARDEC DRAWINGS 5009271 Pin; Stra
11、ight, Headed 5009275 Pin, Straight, Headless 5009300 Spring, Helical Comp 5009351 Spring, Helical Comp 5009352 Spring, Helical Comp 5009356 Spring, Helical Comp 5009369 Tube, Handle 5009394 Screw, Handle Tube 5009524 Spring, Helical Comp 5013424 Pin, Shoulder, Headless 5013515 Plunger, Belt Feed Lev
12、er 5013516 Spring, Helical Comp 5013523 Pin, Straight, Headless 5013524 Plunger, Bolt Latch 5013525 Spring, Helical Comp 5013526 Nut, Bolt Latch Rod 5013527 Spring, Helical Comp 5013539 Stop, Front Cartridge 5013540 Stop, Rear Cartridge 5013541 Stripper, Link Provided by IHSNot for ResaleNo reproduc
13、tion or networking permitted without license from IHS-,-,-MIL-DTL-001298D(AR) w/AMENDMENT 1 35013556 Nut, Slotted Hexagon 5013581 Pin, Straight Headed 5013583 Spacer, Back Plate 5013588 Cover, Trunnion Block 5013622 Screw, Machine Hex Hd 5013623 Nut, Plain Hex 5013681 Shoulder Bolt 5013686 Nut, Slot
14、ted, Hexagon 5013691 Spring, Helical Torsion 5013692 Spring, Helical Torsion 5013693 Spring, Helical Comp 5013697 Washer, Thrust 5140428 Spring, Locking, Elevating Mech. 5152750 Piece Filler 5152834 Screw, Adjusting 5152835 Disk, Buffer Fiber 5152839 Plunger, Adjusting Screw 5152854 Pin, Headed 5152
15、869 Plate, Buffer 5152896 Spring, Trigger Safety 5152897 Screw, Trigger Safety 5152939 Nut, Slotted Hexagon 5153191 Screw, Machine 5351211 Headspace Gage Caliber .50 5351213 Timing Gage, Caliber .50, (No Fire) 5351214 Timing Gage, Caliber .50, (Fire) 5351220 Slide, Sear 5504060 Latch, Bolt or Alt La
16、tch, Bolt 5504062 Switch, Bolt 5504067 Sear 5504071 Release, Bolt Latch 5504080 Carrier Assy, Barrel 5504081 Receiver Select Fit Assy second, with the sear slide reversed to the other side; and third, directly to the sear from the top. The load shall be applied five times at each of the three points
17、. 4.9 Firing pin indent. The firing pin indent, when taken in Government Standard copper compression cylinders Drawing 8440920 inserted into a holding fixture Drawing 5520627, shall be computed by measuring the distance from the original surface before indentation) of the cylinder to the bottom of t
18、he impression. 4.10 High pressure resistance. Each M2 shall be mounted in a firing fixture with safety cover conforming to Drawing 8440929 or approved equivalent and tested by firing one high pressure test cartridge. After proof firing, the high pressure cartridge case shall be visually examined for
19、 bulges, splits, rings, and other defects caused by defective barrels. 4.10.1 Magnetic particle inspection. The M2 shall be visually inspected for cracks, deformations, or other damage; and the bolt subassembly, barrel extension assembly, and barrel assembly shall be magnetic particle inspected in a
20、ccordance with ASTM E 1444 and drawings 6147463, 5504082, and 7266131. 4.11 Functioning. Each M2 shall fire 50 rounds right side feed and 50 rounds left side feed using a test fixture Drawing 8440929 or approved equivalent. Each 50 round segment shall be fired 25 rounds spasmodic and 25 rounds conti
21、nuous burst. Parts within the receiver group, cover group, and bolt group shall be disassembled from right side feed and reassembled for left side feed. If a M2 fails to fire 50 rounds on either side, it can be retested and accepted by completing two consecutive successful test. 4.11.1 Functioning a
22、lternate sample size. If 500 consecutive M2s meet the requirement, the number of M2s to be tested each month of production shall be reduced to two M2s or 5% of the total monthly production rounded up to the next higher whole number, whichever is greater (see 6.11). 4.12 Belt pull. Each M2 shall be t
23、ested for belt pull using the applicable pieces of the belt pull test fixture Drawing 8440929. Fire a 10 round burst right side feed and a ten round burst left side feed. The ten round metallic linked belts shall be loaded with ten rounds of live and two rounds of dummy ammunition. The live ammuniti
24、on shall feed into the machine gun first. The turn-buckle part 15 of the fixture shall be adjusted to feed the rounds horizontally or with not over a 5 degree rise from the pulley to the feedway of the weapon. M2s that fail to fire the initial ten round burst right or left hand feed may be retested
25、and accepted if the above procedure is successfully repeated. M2s may be mechanically gymnasticated for a period not longer than ten minutes prior to retesting. 4.12.1 Belt pull alternate sample size. If 500 consecutive M2s meet the requirement the number of M2s to be tested each month of production
26、 shall be reduced to two M2s or 5% of the total monthly production rounded up to the next higher whole number, whichever is greater (see 6.11). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-001298D(AR) w/AMENDMENT 1 134.13 Cyclic rate of fi
27、re. Each M2 shall be tested for cyclic rate of fire using test fixture Drawing 8440929 or approved equivalent. This test may be performed concurrently with the 25 round continuous fire burst described in paragraph 4.11. Record the cyclic rate of fire of each M2. 4.14 Targeting and accuracy. 4.14.1 T
28、argeting and accuracy test M2 Caliber .50 Heavy Machine Gun, Flexible. The M2 Caliber .50 Heavy Machine Gun, Flexible shall be mounted in a firing fixture conforming to Drawing 8440929 or an approved equivalent. With the leaf of the rear sight in the folded-down position and the windage scale adjust
29、ed to zero, the sights shall be aligned at 6 oclock on the sighting image of the targeting and accuracy diagram 7266955 made with target paper, at a range of 100 feet, fire a 10 round continuous burst. 4.14.2 Accuracy test M2 Caliber .50 Heavy Machine Gun, Turret Type (M48 Series). With the weapon b
30、ore sighted on the point of aim on the sighting image of a target meeting the requirements of Drawing 7266955 made with target paper, at a range of 100 feet, fire a 10 round continuous burst. 4.15 Endurance. One M2 from each lot shall be tested, after having been found to be satisfactory in all test
31、s 4.4 - 4.14. The M2 shall be mounted in a firing fixture conforming to Drawing 8440929 or an approved equivalent. The test shall be started with left hand feed and the direction of feed shall be changed every 1000 rounds. The firing schedule shall be 50 rounds in interrupted bursts followed by a 50
32、 round continuous burst. The barrel shall be air cooled to ambient temperature after each 100 rounds fired. The ammunition may be linked in 50 round belts or in 100 round belts with a dummy inert round separating each 50 rounds. During the interrupted burst firing, the bolt latch release (if applica
33、ble) shall be released at least twice to stop the firing and the trigger shall be released at least three times to stop firing. The average cyclic rate of fire for 25 rounds shall be measured and recorded during the first 50 round continuous burst of each 1000 rounds. The average muzzle velocity of
34、10 consecutive rounds shall be determined during the first 50 rounds fired, during, 4900-5100 rounds fired and during 9900-10,000 rounds fired. Ten rounds may be fired for warm-up before the velocity is measured. For maintenance schedule (see 6.5). 4.15.1 Endurance retest. If the M2 representing any
35、 lot fails to meet the specified requirements in the test, a retest shall be performed. For the retest, another M2 shall be selected from the retest lot under consideration. However, if the failure indicates defects in the M2, a retest shall be performed only if authorized by the procuring agency. I
36、f a retest is not performed or the M2 selected fails in the retest, the lot shall be rejected subject to conditioning and further testing. 4.16 Barrel Erosion. M2 Barrels failing to remain within the requirements for barrel erosion shall be cause for rejection of the lot of M2s. Each barrel used in
37、the endurance test shall be evaluated concurrently for barrel erosion. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-001298D(AR) w/AMENDMENT 1 144.17 Interchangeability. Ten M2s shall be selected from each lot, be inspected for and shall co
38、mply with the requirements for firing pin protrusion, headspace, timing and firing pin release before and after interchange of parts using the inspection methods specified in 4.5, 4.6, 4.7, and 4.8. M2s shall be tested for interchangeability by disassembling and then reassembling parts using the par
39、ts and the prearranged system. Interchange of parts shall be accomplished by dividing the parts of each machine gun into 10 groups of non-mating parts as shown Tables III and IV (as applicable), and distributing the groups into 10 different trays until each tray contains parts for a complete M2. Gro
40、ups of parts from the first M2 shall be taken in order and placed in trays 1 through 10 in that sequential order; groups of parts from the second M2 shall be taken in order and placed starting at tray 2 through tray 10 and finishing in tray 1; groups of parts from the third M2 shall be taken in orde
41、r and placed starting in tray 3 through tray 10 and finishing in tray 2; and so on. Commercial parts such as screws, spring pins, etc., shall be placed in the same tray as their mating or associated part. Any commercial part rendered unserviceable by disassembly shall be replaced without penalty to
42、the interchangeability test. The M2s shall be reassembled using only those parts which are in the same tray. In addition, the M2s shall be tested for functioning requirements 3.10, and targeting and accuracy (flexible) or accuracy (turret type), 3.13 as applicable after interchange of parts using th
43、e test methods specified in 4.11 and 4.14. Test frequency may be reduced; by approval of the procuring agency, to not less than one test of ten M2s from each lot when a record of consistently satisfactory results has been established. Failure of the interchangeability test shall cause retest or reje
44、ction of the lot. An interchangeability retest may be allowed without reconditioning the lot. Failure in the retest shall cause rejection of the lot subject to reconditioning and further test as a reconditioned lot. A sample of 20 M2s from each retest or reconditioned lot shall be tested using the s
45、ame procedure described above. 4.17.1 Repair parts. At least two parts from each M2 inspection lot of repair parts shall be subjected to interchangeability by disassembling two M2s, previously tested in 4.17, as necessary, and then reassembling them using the repair parts. Any modification of parts
46、to fit is not allowed. The M2s shall operate and function properly. This test shall be performed independently of the M2 interchangeability test specified in 4.17 and at more frequent intervals using accepted M2s taken from current production. Failure of any part to meet the requirements shall be ca
47、use for rejection of the represented lot of parts subject to reconditioning and further test as a reconditioned lot. A sample of double the number parts used in the original test shall be tested from each reconditioned lot. Provided by IHSNot for ResaleNo reproduction or networking permitted without
48、 license from IHS-,-,-MIL-DTL-001298D(AR) w/AMENDMENT 1 15TABLE III. M2 caliber .50 heavy machine gun, flexible Groups of non-mating parts flexible Group I Group II Bar, Trigger 6257592 Bolt Subassembly 6147463 Barrel Assy 7266131 Rod Assy, Oil Buffer Piston 6008763 Extension Assy, Firing Pin 600897
49、6 Pin, Locking 7312970 Extractor Assy 6008959 Spring, Cover Extractor 6009741 Pin, Cocking Lever 7312078 Pawl, Cover Detent 7313069 Spring, Cover Latch 6008931 Pin Assy, Breech Lock 6008784 Cam, Lock Breech 6147583 Pin Assy, Trigger Bar 7313106 Shoulder Bolt 5013681 Spring, Helical Corn 5013693 Slide, Retracting 6147893 Carrier Assy, Barrel 5504080 Spring, Switch 6008943 Nut, Slotted
