1、 METRIC 1 MIL-C-70726A (AR) Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document, should be addressed to: Commander U.S. Army ARDEC, ATTN: SMCAR-BAC-S, Picatinny Arsenal, New Jersey 07806-5000 by using the self-addressed St
2、andardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. O6 December 1993 SUPERSEDING MIL-2-70726 (AR) 2 February 1993 MILITARY SPECIFICATION CARTRIDGE, CALIBER .50, BLANK, XM928, PERFORMANCE SPECIFICATION FOR This specification is approved for u
3、se by the U.S. Army Armament, Munitions and Chemical Command, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers requirements, quality assurance provisions, and preparation for delivery for Cartridge, Caliber .50, XM92
4、8 Blank for use in Caliber .50 M2 Browning Machine Gun With M19 Blank Firing Attachment (BFA) and Caliber .50 M85 MG with M20 BFA. (See 6.1). 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form
5、a part of - this document to the extent specified herein. specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation. Unless otherwise ENT A, Approved for pu
6、blic release; distribution is unlimited. FSc 1305 AMSC NIA O Licensed by Information Handling ServicesMIL-C-7072bA W 999990b LbZb5 T0 W MIL-C-70726A (AR) SPECIFICATIONS FEDERAL A-A-203 0-1-503 P-D-680 VV-L-800 MILITARY MIL-C-372 MIL-L-2104 MIL-A-2550 MIL-L-14107 MIL-L-46000 MIL-L-46167 MIL-A-48078 M
7、IL-L-63460 STANDARDS MIL I TARY DOD-STD-100 MIL-STD-1 O9 MIL-STD-129 * MIL-STD-636 MIL-STD-644 MIL-STD-650 MIL-STD-810 MIL-STD-973 MIL-STD-1168 - Paper, Kraft, Untreated Insect Repellant Dry Cleaning Solvent Lubricating Oil, General Purpose Preservative, (Water-Displacing, Low Temper ature ) Cleanin
8、g Compound Solvent for Bore of Small Arms and Automatic Aircraft Weapons Lubricating Oil, Internal Combustion Engine, Tactical Service Ammunition, General Specification for Lubricating Oil, Weapons Low Temperature Lubricant, Semi-Fluid (Automatic Weapons) Lubricating Oil, Internal Combustion Engine,
9、 Arctic Ammunition, Standard Quality Assurance Provisions, General Specification for Lubricant, Cleaner and Preservative for weapons and Weapon Systems Engineering Drawing Practices Quality Assurance Terms and Definitions Marking for Shipment and Storage Visual Inspection Standards for Small Arms Am
10、munition through Caliber .50 visual inspection Standards and inspection Procedures for Inspection of Packaging, Packing and Marking for Small Arms Ammunition Explosives: Sampling, Inspection, and Testing Environmental Test Methods and Engineering Guidelines Configuration Management Ammunition Lot Nu
11、mbering 2 Licensed by Information Handling ServicesMIL-C-70726A (AR) (Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from: DODSSP - Customer Service, Standardization Documents Order Desk, 700 Robbins Avenue, Bldg 4D, Philadelphia, PA
12、 19111-5094.) 0 2.1.2 Other Government documents, drawings, and publications. drawinas, and publications form a part of this document to the The following other Government documents, extentdspecifid herein. are those cited in the solicitation. Unless otherwise specified, the issues DRAWINGS (see 6.6
13、) US ARMY ARMAMENT RESEARCH, DEVELOPMENT, AND ENGINEERING CENTER ( ARDEC ) PRODUCT AND PACKING DRAWINGS * * * * * * 7046650 - 7553296 - 7553347 - 7643674 - 8648301 - 8648303 - 8648306 - 8648903 - 8648904 - 10885124 - 12576456 - 12576457 - 12576458 - EL86 49 40 3 - EL8 6 4 9 4 04 EL8 64 94 05 - EL8 6
14、4 94 O 6 EL8 649 4 O 7 EL86 54 13 1 - EL8654133 - EL8 6 5 8 29 2 19-48-4116/14 - - - - - Mount Machine Gun Pintle and Ammo Tray Assembly used on M66 Ring Mount and M4 Pedestal Mount Box, Ammunition, M2A1 Assembly Box, Wirebound Boxes, Ammunition, M2A1 Classification of Cartridge Case Defects Small A
15、rms Ammunition Gage, Receiver, Profile and Alignment, Caliber .50 Cartridges Gage, Plug, Acceptance Check Shoulder Angle Gage, Plug, Wear Limit Check - Neck Gage, Fixture, indicating - Head Dia. Gage, Fixture, Indicating - Diameter of Extractor Groove Installation, Pedestal - Gun Mount, M4 Packing a
16、nd Marking for Box, Wirebound for Cartridge, Caliber .50 Packing and Marking for Box, Ammunition, M2A1 for Cartridge, Caliber .50 Cartridge, Caliber .50 Blank, XM928 Screen Perforation Muzzle Flash Fouling Function and Casualty Noise Level Residual Stress Waterproofness Primer Sensitivity Unitizatio
17、n Procedures for Boxed Ammunition and Components on Four Way Entry Pallets 3 Licensed by Information Handling ServicesMIL-C-7072bA m 99Ob Lb2b7 863 = MIL-C-70726A (AR) PUBLICATIONS US ARMY ARMAMENT RESEARCH, DEVELOPMENT, AND ENGINEERING CENTER TB-700-2 - Department of Defense Explosives Hazard Class
18、ification Procedures TECP 700-700 - Manual of Test Methods for Small Arms VOL. III Ammunition JSSPM - Joint Services Safety and Performance Manual for Qualification of Explosives for Military Use TEST OPERATIONS PROCEDURES (TOPS) U.S. ARMY TEST AND EVALUATION COMMAND (TECOM) TOP 1-2-601 - Laboratory
19、 Vibration Schedule TOP 3-2-045 - Automatic Weapons, Machine Guns, Hand and Shoulder Weapons TOP 4-2-601 - Drop Tower Tests for Munitions TOP 4-2-602 - Rough Handling CODE OF FEDERAL REGULATIONS TITLE 49 - Transportation, Parts 100-199 (The Code of Federal Regulations is available from the Superinte
20、ndent of Documents, U.S. Government Printing Office, Washington, D.C. 20402-0001. Orders should specify, “49 CFR 100-199 (LATEST REVISION“).“ (Copies of other Government documents, drawings and publications required by the suppliers in connection with specific procurement functions should be obtaine
21、d from the procuring activity or as directed by the contracting officer.) 2.2 Nonqovernment publications. The following document(s) forms a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DOD adopted are those listed in the issu
22、e of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation. American National Standards Institute (ANSI) ANSI Y14.5M-1982 - Dimensioning and Tolerancing (Application for copies shou
23、ld be addressed to American National Standards Institute, 1430 Broadway, New York, NY 10018.) 4 Licensed by Information Handling ServicesMIL-C-7072bA m 999990b 39b92b8 7TT m MIL-C-70726A (AR) 2.3 Order of precedence. In the event of conflict between the text of this document and the references cited
24、 herein, the text of this document takes precedence. document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. (See contract provisions for additional precedence criteria). Nothing in this 3. REQUIREMENTS 3.1 General. The cartridges shall comply wit
25、h the requirements shown on drawing 12576458, reference specifications and the requirements stated in this section. All of the cartridge components shall be compatible with each other. The primer mix shall be noncorrosive and the propellant shall be smokeless. The cartridge shall be compatible with
26、Caliber .50 M9 and M15A2 links, the M2 Browning Machine Gun (M2BMG) with M19 BFA, and M85 Machine Gun with M20 BFA weapon systems. ammunition is to be procured for use with M2 Browning Machine Guns the cartridges shall be linked with M9 links. When ammunition is to be procured for use with M85 Machi
27、ne Guns the cartridges shall be linked with M15A2 links. When 3.2 Qualification. A sample shall be submitted for qualification in accordance with (IAW) the technical provisions specified herein (see section 4). The purpose of qualification is to verify that a particular contractors design shall be c
28、onsidered qualified indefinitely. The contractor shall submit level 3 detailed item drawings IAW DOD-STD-100, MIL-A-2550 and ANSI Y14.5-82 to the Government for configuration control. All changes shall be submitted IAW MIL-STD-973 for review and approval by the Government. The Government reserves th
29、e right to subject the revised design to any or all the qualification evaluations specified in 4.3 at the expense of the contractor. 3.3 First article inspection. When specified in the contract or purchase order, a sample shall be subjected to first article inspection IAW the technical provisions sp
30、ecified herein (see 4.4). 3.4 Performance characteristics. 3.4.1 Primer sensitivity. The value of the average height (h) minus 2 standard deviations (s) shall be equal to or more than 63mm (2.5“). For cartridges with metal cases the value of h + 5s shall be equal to or less than 381mm (15“). For car
31、tridge cases made of other materials, the value of h + 5s shall be established by the contractor prior to completion of Qualification testing. 3.4.2 Residual stress. The cartridge shall not split when subjected to-the accelerated stress test for the applicable materials. 5 Licensed by Information Ha
32、ndling ServicesIL-C-7072bA m 9997906 1969269 636 MIL-C-70726A (AR) 3.4.3 Waterproof. The cartridge shall release not more than one bubble of air when tested at a pressure of 14 kPa (2 psi) below atmospheric pressure for 15 seconds. 3.4.4 Function and casualty. The cartridges shall function without c
33、asualty throughout a temperature range of -2OC (-4F) to +50C (122F). The cartridges shall safely function throughout a temperature range of -5OC (-58F) through +70C (158F). 3.4.4.1 Cyclic rate. 3.4.4.1.1 M2 BMG. The blank cartridges when temperature conditioned shall operate the M2 BMG with M19 BFA
34、at an average cyclic rate between 450 and 600 shots per minute (spm) throughout the temperature range of -2OC (-4F) to +SOC (122F). conditioned shall operate the M85 MG with M20 BFA at an average cyclic rate between 450 and 600 shots per minute (spm) throughout the temperature range of -2OC (-4F) to
35、 +50C (122F). 3.4.4.1.2 M85 MG. The blank cartridges when temperature 3.4.4.2 Noise level. The noise levels of cartridges shall be no ureater than 164 decibels nor more than 10 decibels below the noise level of M33 ball cartridges fired under identical conditions. 3.4.4.3 Screen perforation. The car
36、tridges conditioned throughout the temperature range of -2OC (-4F) to +50C (122F) when fired in a M2 BMG with M19 BFA or M85 MG with M20 BFA, shall not cause perforations greater than or equal to 2.5mm (.i inch) diameter in a paper screen placed perpendicular to the line of fire at a distance of 5 m
37、eters (15 feet) from the muzzle of the weapon. 3.4.4.4 Muzzle flash. The flash produced at the muzzle of both the M2 BMG with M19 BFA and M85 MG with M20 BFA shall be visible at i00 meters (i10 yards) from the muzzle of the weapon in the dark. 3.4.4.5 Breech flash. Breech flash when firing cartridge
38、s shall not be unsafe for the gunner. 3.4.4.6 Foulinq. The fouling produced by firing 500 cartridges shall not cause more than one weapon stoppage, any safety problems, and shall be readily removable using standard cleaning methods, The fouling produced by firing 500 cartridges shall not cause a cha
39、nge in cyclic rate from the first 100 rounds to the final 100 rounds greater than 15% when fired in M2 BMG with M19 BFA and M85 MG with M20 BFA . * 3.4.4.7 Attitude. The cartridge shall operate the M2 BMG with M19 BFA when fired at an attitude of 2 85 degrees. 6 Licensed by Information Handling Serv
40、icesMIL-C-7072bA m 990b Lb270 358 m MIL-C-70726A (AR) 3.4.4.8 Belt pull. The cartridge shall operate the M2 BMG with M19 BFA and M85 MG with M20 BFA when a 100 round belt of cartridges is loaded in the weapon and the belt of cartridges is allowed to hang freely. 3.4.4.9 Hot chamber effect. A cartrid
41、ge inserted in the chamber immediately following the continuous firing of 100 cartridges shall not fire (cook off). In addition the cartridge shall not deform to the extent that clearing of the weapon is made difficult following the proper waiting period. 3.4.4.10 Chemical compatibility. The reliabi
42、lity of the cartridge shall not be less than .900 at 90% confidence level after having been immersed in the following lubricants solvents, or chemicals: Specification Material MIL-L-46000 MIL-L-14107 MIL-L-2104 MIL-L-46167 MIL-L-63460 VV-L-800 MIL-C-372 0-1-503 P-D-680 Lubricant, Semi-Fluid (LSA) Lu
43、bricating Oil, (LAW) Lubricating Oil, (ICE, T) Lubricating Oil, (ICE, A) Lubricant, (CLP) Lubricating Oil, (PL-S) Bore Cleaner, (RBC) Insect Repellant Dry Cleaning Solvent (SD-1) 3.5 Environmental. 3.5.1 Sand and dust. The reliability of the cartridge shall not be less than .900 at 90% confidence le
44、vel of the reliability of the Caliber .50 M33 Ball cartridges when both are subjected to the sand and dust test. 3.5.2 Corrosion. The cartridge shall fire safely in the weapon after being subjected to a 5% salt spray solution for 48 hours. 3.5.3 Temperature/humidity cycling. After being subjected to
45、 a 10 day temperature/humidity cycle, the cartridge when fired shall not change the cyclic rate of the weapon by more than 15% and the reliability shall not be less than .900 at 90% confidence level. 7 Licensed by Information Handling ServicesMIL-C-7072bA = 9999906 L96927L 294 = MIL-C-70726A (AR) 3.
46、5.4 Long term storaqe. 3.5.4.1 Lonq term hiqh temperature. After being subjected to 30 days of continuous heating at 65C (150F) and 10 to 20% relative humidity, the cartridge when fired shall not change the cyclic rate of the weapon by more than 20%. The reliability shall not be less than .900 at 90
47、% confidence level. If the cartridge fails to meet either of these requirements, the cartridge shall be retested after conditioning at SOC (122F) and i0 to 20% relative humidity for 120 days. 3.5.4.2 Long term low temperature. After being subjected to 30 days of continuous coolinq at -4OC (-40F), th
48、e cartridqe when fired shall not change the-cyclic rate ofthe weapon by-more than 20%. The reliability shall not be less than .900 at 90% confidence level. 3.5.5 Rouqh handlinq. 3.5.5.1 Sequential. Cartridges when packaged in wirebound boxes, shall be subjected to the transportation-vibration, loose
49、 cargo, 1.5 meter drop test, and the 2.1 meter drop tests. The cartridges shall be safe to handle, store, and fire. The reliability shall not be less than .900 at 90% confidence level. 3.5.5.2 12 meter drop. After being subjected to the 12 meter (40 ft) drop test the wirebound packaged cartridges shall not detonate, deflagrate, loose propellant, and must be safe to handle and to dispose. 3.5.6 Toxic fumes. The toxic fumes produced by the cartridge shall be acceptable to the Surqeon General for the applicable training scenarios. 3.6 Safetv. 3.6.1 Safety hazard classifi
