Firearms Market

Firearms

Precision Tubing Engineered for Firearm Manufacturing

Plymouth®’s seamless cold drawn steel, seamless stainless steel, and welded stainless steel tubing and engineered shapes provide the precision and tight tolerances required for firearm manufacturing. Machine-ready profiles help eliminate unnecessary machining, reduce material waste, and streamline downstream processing.

Based on application-specific requirements, we offer custom cold drawn shapes engineered for exact mechanical properties and repeatable performance. Our proprietary processes deliver consistent, carefully engineered profiles that support efficient manufacturing while balancing performance and value.

Firearms Applications:

  • Magazine tubes
  • Bolt actions
  • Receivers
  • Barrels
  • Slides
  • Trigger mechanisms
Firearms

Precision Tubing Engineered for Firearm Manufacturing

Plymouth®’s seamless cold drawn steel, seamless stainless steel, and welded stainless steel tubing and engineered shapes provide the precision and tight tolerances required for firearm manufacturing. Machine-ready profiles help eliminate unnecessary machining, reduce material waste, and streamline downstream processing.

Based on application-specific requirements, we offer custom cold drawn shapes engineered for exact mechanical properties and repeatable performance. Our proprietary processes deliver consistent, carefully engineered profiles that support efficient manufacturing while balancing performance and value.

Firearms Applications:

  • Magazine tubes
  • Bolt actions
  • Receivers
  • Barrels
  • Slides
  • Trigger mechanisms

Plymouth® Firearms Products

Several Plymouth® products are used throughout the firearms market, including carbon DOM tubing, cold drawn shapes, stainless steel and carbon steel extrusions, and various types of seamless and welded tubing. Our century of metallurgical experience delivers the dimensional control and tight tolerances required for firearms applications and provides customers with machine-ready profiles for efficient manufacturing.

Carbon DOM Tubing

Firearms manufacturing relies on DOM tubing for high-precision components that require reliable tolerances and consistent machinability, from sporting rifles to mounting systems. Some of the firearms applications for DOM tubing include:

  • Receiver extensions
  • Suppressor sleeves
  • Tripod/bipod support components

ASTM A513-5: Carbon DOM Tubing Specifications

MeasurementInches/FeetMetric

OD Range 

0.250” – 1.8750” 

6.35mm – 47.63mm 

Wall Range

0.025” – 0.125” 

0.635mm – 3.175mm 

Maximum Length 

26’ 

7.9 m

Industry Specifications

  • Carbon Grades: 1010 – 1020

Cold Drawn Seamless Steel Tubing

Seamless cold drawn steel tubes provides the tight tolerance control and exacting engineering standards necessary for firearm construction, and the tubing’s machine-ready profile eliminates scrap material and reduces the time required for machining and other processing. Some of the firearm components constructed with cold drawn tubing include:

  • Receivers
  • Bolt actions
  • Magazine tubes
  • Gas block/tubes
  • Barrels

ASTM A519: Cold Drawn Seamless Carbon & Alloy Steel Tubing Specifications

MeasurementInches/FeetMetric

 OD Range

0.250” – 2”

6.35mm – 50.8mm

Wall Range

0.025” – 0.187” 

0.635mm – 4.75mm 

Maximum Length 

26’ 

7.9m

Industry Specifications

  • Carbon Grades: 1010 – 1018
  • Alloy Grades: 4130, 4140

ProMoly® Specifications

Measurement Inches/FeetMetric

OD Range 

0.250” – 2.000” 

6.35mm – 50.8mm 

Minimum OD Tolerance

+/- 0.005” (up to 1.500” OD)

+/- 0.127mm (up to 38.1mm) 

Maximum OD Tolerance

+/- 0.10” (above 1.500” OD)

+/- 2.54mm (above 38.1mm) 

Wall Range

0.025” – 0.187”

0.635mm – 4.75mm 

Minimum Wall

Tolerance +/- 10% (For IDs over 0.500”) 

+/- 10% (For IDs over 12.7mm) 

Maximum Wall Tolerance 

+/- 15% (for IDs under 0.500”) 

+/- 15% (for IDs under 12.7mm) 

Maximum Length

26’

7.9m

Minimum Yield StrengthMinimum Tensile StrengthMinimum Percent Elongation in 2”, Full Tube

95,000 psi 

105,000 psi

15%

Industry Specifications and Certifications

  • Grade: 4130
  • Industry Specifications: AMS-T-6736A | AMS-6371 | AMS-6360 | MIL-T-6736B
  • Certifications: ISO 9001

ProMoly® is a registered trademark of Plymouth Tube Company.

Cold Drawn Shapes

Accelerate your firearms production with Plymouth®‘s cold drawn shapes. Our proprietary engineering yields near-net, machine-ready profiles that drastically cut secondary machining time and minimize scrap, delivering the mechanical consistency required for top-tier components:

  • Receiver components
  • Bolt and slides
  • Attachment systems
  • Magazine locks
  • Trigger mechanisms

Cold Drawn Shape Specifications

Material Specifications

Carbon & Alloys

US Grades in Series 1000, 4000, 6000, 8000, 9000

Stainless Steel in Complex Geometries 

Series 300 & 400 Stainless Steel 

PH Grades in Rounds, Hexes or Octagons 

17-4, 17-7, 15-5, 13-8 

Exotic Alloys 

Monel 400, Inconel, Hastelloy, etc.

Shape Specifications

Solid, Round 

0.2500” – 3.750” OD 

Hexagon and Octagons, across flats 

0.3125” – 3.625” 

Rectangles and Squares 

0.625” per side min, 5.000” max 

Unique Shapes

Greater than 0.625” 

Profile must fit within 6.500” Diameter Circle

Dimensional Specifications

Dimensional Tolerance, Standard* 

+/- 0.005” 

Fillet and Radii Tolerance, Standard* 

0.015” in Carbon, 0.360” in Stainless 

Ratio of Height vs. Width

1 : 1.16 (Max.) 

Cross-Sectional Area 

0.125 sq. in. (Min.)

*Tighter Tolerances may be available

Carbon Steel Extruded Engineered Shapes

Carbon & Alloy Steel Grades

1018
1029
1030
1035
1040 

1045
1050
1060
1215
4130 

4140
4150
4340
6150 

8620
8630
8640
9310 

A36
A588
A690
Grade 50
Grade 60

Industry Specifications

AMS S6758
AMS 6415
AMS S5000 

ASTM A 36
ASTM A 105
ASTM A 322 

ASTM A 576
ASTM A 588
ASTM A 690 

AMS-S-6758A
AMS 6382

Outside Dimensions 

Shape cross-section must fit within 6” (152.4mm) diameter.

Stainless Steel Extruded Engineered Shapes

Stainless Steel Grades 

303 304 series 310 316 series 

400 series 418 422 

13-8 MO 15-5 PH 17-4 PH 17-7 

Industry Specifications

AMS 5610
AMS 5613
AMS 5616
AMS 5621
AMS 5627 

AMS 5629
AMS 5639
AMS 5640
AMS 5643
AMS 5645 

AMS 5646
AMS 5648
AMS 5651
AMS 5659
AMS QQS 763 

ASTM A 276
ASTM A 511 

Outside Dimensions 

Shape cross-section must fit within 5.5” (139.7mm) diameter.

Seamless Stainless Steel Tubing

Plymouth® uses seamless stainless steel tubing to manufacture machine-ready profiles used to streamline the manufacture of various firearm components:

  • Magazine tubes
  • Receivers
  • Barrels
  • Bolt actions
  • Slides

Seamless Stainless Steel Tubing Mechanical Properties

Tensile Strength

515 MPa minimum / 75,000 psi minimum 

Yield Strength

205 MPa minimum / 30,000 psi minimum 

Total Elongation Under Load 

30.000% 

Hardness 

22 Maximum HRC

Alloys

  • Austenitic: 304/L/N, 316/L/N, 317/L, 321, 347
  • Duplex/Lean Duplex: 2101, 2205, 2507
  • Nickel Alloy: 600, 625, 800, 825

Welded Stainless Steel Tubing

Maximize your operational value without sacrificing quality. Plymouth®’s welded stainless steel tubing offers firearms manufacturers a highly cost-effective material solution that reduces material waste and streamlines downstream component assembly for:

  • Magazine tubes
  • Receivers
  • Barrels
  • Bolt actions
  • Slides

Welded Stainless Steel Tubing Mechanical Properties

Tensile Strength 

515 MPa minimum / 75,000 psi minimum 

Yield Strength 

205 MPa minimum / 30,000 psi minimum 

Total Elongation Under Load  

30.000%

Hardness

22 Maximum HRC

Alloys

  • Austenitic: 304/L/N, 316/L/N, 317/L, 321, 347
  • Ferritic/Super-Ferritic: 430, 439
  • Duplex/Lean Duplex: 2101, 2205, 2507
  • High Nickel: AL-6XN®, 600, 625, 800, 825, C-276, C-22
  • PH Grades: 17-4, 17-7
  • Specialty: E-Brite®, Nitronic 30/40, Alloy 20, Invar 36, 718, 21-6-9

Downloads & Resources

FileLanguageSizeDownload
Plymouth® Product CatalogEN4 MB Download
Stainless Steel Tubing: Austenitic, Ferritic & DuplexEN676 KB Download
Extruded Engineered Shapes and Cold Drawn ShapesEN406 KB Download
Precision Cold Drawn Net ShapesEN256 KB Download
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