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"The TDP"

When most people mention “TDP”, they are talking about the Colt M16 Technical Data Package. This is the O.G. that still defines most of the requirements for today’s AR-style military hardware. The subsequent M4 TDP is equally as important.

We assume that you have read the preceding articles, so you are familiar with the principles, conventions, and symbology. If not, please go back to Spec to Inspect.

The table below defines the material and finish requirements for the primary solid components — excluding springs, roll pins, non-metallic components, and parts that only apply to a certain configuration — of the M16/M4.

TDP Specifications – Materials and Finishes
Component TDP Material MIL-STD-171 Finish Nominal TDP Finish Solid Film Lube
ComponentUpper Receiver TDP Material7075-T6 MIL-STD-171 Finish7.5.2 Nominal TDP FinishType III Class 2 Hard Anodic Solid Film LubeYes
ComponentHandguard TDP Material6061-T6 MIL-STD-171 Finish7.2.2 Nominal TDP FinishType II Class 2 Anodic Solid Film Lube—
ComponentBarrel TDP MaterialCroMoV MIL-STD-171 FinishExterior: 5.3.1.2
Bore: 1.2.2.2		 Nominal TDP FinishExterior: Class 2 Manganese Phosphate
Bore: Class 2b Chromium		 Solid Film Lube—
ComponentBarrel Extension TDP Material8620 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentBarrel Indexing Pin TDP Material1137, 1141, or 1144 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentBarrel Nut TDP Material4130 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentMuzzle Device TDP Material4130 or 4140 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentGas Block/Front Sight Base TDP Material1137 or 1141 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentGas Tube TDP Material304 or 321 MIL-STD-171 Finish5.4.1 Nominal TDP FinishClean and Passivate Solid Film Lube—
ComponentGas Tube Plug TDP Material302, 304, or 321 MIL-STD-171 Finish5.4.1 Nominal TDP FinishClean and Passivate Solid Film Lube—
ComponentBolt TDP MaterialC158 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentExtractor TDP Material4140 or 4340 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentExtractor Pin TDP MaterialS1 to S7 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentEjector TDP MaterialS1 to S7 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentCarrier TDP Material8620 MIL-STD-171 FinishExterior: 5.3.1.2
Bore: 1.2.2.2		 Nominal TDP FinishExterior: Class 2 Manganese Phosphate
Bore: Class 2b Chromium		 Solid Film Lube—
ComponentGas Key TDP Material4130 MIL-STD-171 FinishExterior: 5.3.1.2
Bore: 1.2.2.2		 Nominal TDP FinishExterior: Class 2 Manganese Phosphate
Bore: Class 2b Chromium		 Solid Film Lube—
ComponentGas Key Screws TDP Material4037 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentCam Pin TDP Material4340 MIL-STD-171 Finish5.3.1.3 Nominal TDP FinishClass 3 Manganese Phosphate Solid Film LubeYes
ComponentFiring Pin TDP Material8640 or 8740 MIL-STD-171 Finish1.2.2.4 Nominal TDP FinishClass 2d Chromium Solid Film Lube—
ComponentFiring Pin Retaining Pin TDP Material1038 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentEjection Port Cover TDP Material1045 to 1055 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentEjection Port Cover Latch Housing TDP Material1018 to 1022 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentEjection Port Cover Latch TDP Material1117 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentEjection Port Cover Hinge Pin TDP Material1018, 1112, or 1215 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentForward Assist Pawl TDP Material1137, 1141, or 1144 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentForward Assist Pawl Detent TDP Material1018, 1020, 1022, or 1117 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentForward Assist Plunger TDP Material1137, 1141, or 1144 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentForward Assist Plunger Cap TDP Material1137, 1141, or 1144 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentCharging Handle Body TDP Material7075-T6 MIL-STD-171 Finish7.5.2 Nominal TDP FinishType III Class 2 Hard Anodic Solid Film Lube—
ComponentCharging Handle Latch TDP Material7075-T6 MIL-STD-171 Finish7.5.2 Nominal TDP FinishType III Class 2 Hard Anodic Solid Film Lube—
ComponentLower Receiver TDP Material7075-T6 MIL-STD-171 Finish7.5.2 Nominal TDP FinishType III Class 2 Hard Anodic Solid Film Lube—
ComponentBolt Catch TDP Material8620 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentBolt Catch Buffer TDP Material1117 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentBuffer Body TDP Material7075-T6 MIL-STD-171 Finish7.5.1 Nominal TDP FinishType III Class 1 Hard Anodic Solid Film Lube—
ComponentBuffer Weight, Steel TDP Material1013, 1015, 1213, or 1215 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentBuffer Weight, Tungsten TDP MaterialClass 3 Tungsten MIL-STD-171 FinishN/A Nominal TDP FinishN/A Solid Film Lube—
ComponentBuffer Retainer TDP Material4130, 4140, or 4340 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentMagazine Catch Plate TDP Material1018 or 8620 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentMagazine Catch Shaft TDP Material1018, 1118, or 1215 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentMagazine Release Button TDP Material7075-T6 MIL-STD-171 Finish7.5.2 Nominal TDP FinishType III Class 2 Hard Anodic Solid Film Lube—
ComponentPivot/Takedown Pin TDP Material8620 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentPTP Detent TDP Material1015 to 1018 MIL-STD-171 Finish1.1.2.1 Nominal TDP FinishType II Class 1 Cadmium Chromate Solid Film Lube—
ComponentReceiver Extension TDP Material7075-T6 MIL-STD-171 Finish7.5.2 Nominal TDP FinishType III Class 2 Hard Anodic Solid Film LubeYes
ComponentRE End Plate TDP Material1018 or 1020 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentRE Castle Nut TDP Material1137 or 1141 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentSafety Selector TDP Material8620 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentSafety Detent TDP Material1117 MIL-STD-171 Finish1.1.2.1 Nominal TDP FinishType II Class 1 Cadmium Chromate Solid Film Lube—
ComponentTrigger TDP Material8620 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentHammer TDP Material8620 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentDisconnector TDP Material1065 or 1070 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentHammer/Trigger Pins TDP Material4130 or 4140 MIL-STD-171 Finish5.3.1.2 Nominal TDP FinishClass 2 Manganese Phosphate Solid Film Lube—
ComponentTrigger Guard TDP Material7075-T6 MIL-STD-171 Finish7.5.2 Nominal TDP FinishType III Class 2 Hard Anodic Solid Film Lube—
ComponentTrigger Guard Plunger TDP Material303 MIL-STD-171 Finish5.4.1 Nominal TDP FinishClean and Passivate Solid Film Lube—
PB-Arms Logo

We have a very large collection of both M16 and M4 TDP drawings.

Unfortunately, we have made the decision to remove these from the site due to concerns over potential ITAR violations. We didn’t get in trouble — but the more we read into it, the less we wanted to find out how hard we would be spanked for sharing 50 year old drawings of weapon systems that our government has abandoned or sold to every country in the world.

It can be tough to find these diagrams in a web search and we know this was a great resource. We apologize.

Below, you will find the drawing numbers (at least the ones that we have) for the M16 and M4.

If you are interested in a particular dimension, use the request form, below.

Weapon System
If you know the drawing number, please provide it
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