This guide is built to reduce wrong-part orders by helping buyers verify gun series, wire size, liner cross-reference, torch parts, and related consumables before ordering.

Key Takeaways

• Arc Weld Store lists this product as SKU M16291-2 – 1 EACH.
• It is listed as a replacement .023-.035 liner for Lincoln-style MIG guns.
• Arc Weld Store lists fitment for Magnum 100L, Magnum PRO 100L, and Magnum PRO 175L.
• Arc Weld Store lists Tweco xref 35-40-15 and Lincoln xref KP35-40-15.
• Lincoln’s KP35-40-15 reference is associated with .023-.035 in. cable liners for Magnum PRO 100L and 175L series guns.
• Before ordering, verify your gun series, wire diameter, liner cross-reference, gun lead length, and whether your gun is an older Magnum 100L or a Magnum PRO 100L/175L style.

Product Overview

The M16291-2 is a small-wire replacement liner for Lincoln-style MIG guns. A liner is one of the most common causes of feeding problems when it is worn, kinked, contaminated, too tight for the wire, or mismatched to the wire diameter. Replacing the liner can help restore consistent wire feeding, reduce birdnesting, and reduce erratic starts when the rest of the MIG gun and drive system are in good condition.

Because MIG gun liners are fitment-sensitive parts, do not order by wire size alone. The correct liner depends on gun series, lead length, wire diameter, connector style, and cross-reference number. For this product, the key ordering identifiers are M16291-2, 35-40-15, and KP35-40-15.

Upper-middle CTA:

Best For

• Replacing a worn or contaminated liner in a compatible Lincoln-style MIG gun.
• Feeding .023, .030, or .035 in. wire where the gun and liner fitment are verified.
• Repairing wire feed issues on Magnum 100L, Magnum PRO 100L, or Magnum PRO 175L applications listed by Arc Weld Store.
• Maintenance departments keeping common MIG gun wear parts on hand.
• Shops cross-referencing Lincoln KP35-40-15 or Tweco 35-40-15 style liners.

Key Specs

Compatibility / Fitment Notes

Arc Weld Store lists this liner for Magnum 100L, Magnum PRO 100L, and Magnum PRO 175L Lincoln-style MIG guns. Weld Support Parts breakdown pages also list KP35-40-15 in Magnum 100L and Magnum PRO 100L liner sections, which supports using the gun parts breakdown to confirm the liner family before ordering.

• Wire size: Match the liner to the wire being run. This product is listed for .023-.035 in. wire.
• Gun series: Confirm whether your gun is Magnum 100L, Magnum PRO 100L, Magnum PRO 175L, or another Lincoln-style gun.
• Cross-reference: Verify M16291-2 against Tweco 35-40-15 or Lincoln KP35-40-15 before ordering.
• Lead length: Confirm the liner can be trimmed or matched correctly to the gun lead length. Exact M16291-2 liner length: Unknown (Verify).
• Consumables: Contact tips, nozzles, and diffusers may differ between Magnum 100L and Magnum PRO 100L gun families. Do not assume parts interchange across all 100L-style guns.
• Aluminum wire: This liner is not verified as a Teflon or aluminum-specific liner. Aluminum compatibility: Unknown (Verify).

Before You Order

• Confirm the part number needed: M16291-2.
• Confirm your current liner cross-reference: KP35-40-15 or 35-40-15.
• Confirm your MIG gun series: Magnum 100L, Magnum PRO 100L, Magnum PRO 175L, or other.
• Confirm your wire diameter: .023, .030, or .035 in.
• Confirm your wire type: solid steel, stainless, flux-cored, aluminum, or other. Compatibility: Unknown (Verify).
• Confirm the gun lead length and whether the liner must be trimmed during installation.
• Inspect the contact tip, diffuser, nozzle, drive rolls, and inlet guide for wear before blaming the liner alone.
• Confirm the drive roll groove matches the wire size and wire type.
• Confirm the spool brake is not too tight and the wire is not rusty, dirty, kinked, or oversized.
• Use the MIG gun parts breakdown to verify the correct liner family before ordering replacement parts.

Accessories / Compatible Products

These related Arc Weld Store products are technically relevant to the same Lincoln-style MIG gun repair workflow, but compatibility must be verified by exact gun model and application before ordering.

• 

  M16291-1 Lincoln Style Replacement Liner .035-.045 - Arc Weld by Masterweld

  $24.14

  In Stock

  View Product
  ">M16291-1 Lincoln Style Replacement Liner .035-.045 – Arc Weld by Masterweld — compare if your wire size is .035-.045 instead of .023-.035.
• 

  Lincoln Electric K4528-1, Magnum PRO 100L, Mig Gun, 10'

  $342.57

  In Stock

  View Product
  ">Lincoln Electric K4528-1 Magnum PRO 100L MIG Gun, 10 ft — replacement gun option where the machine and 4-pin connector fitment are confirmed.
• 

  Lincoln Electric Trigger Switch S19725 MIG Gun Switch

  $11.88

  In Stock

  View Product
  ">Lincoln Electric Trigger Switch S19725 MIG Gun Switch — trigger replacement option for listed older Magnum 100L applications.
• 

  Lincoln Electric Co Tip Contact 350A Tapered .035 (0.9Mm) 10/Pk

  $23.59

  In Stock

  View Product
  ">Lincoln Electric KP2744-035T Tapered .035 Contact Tips, 10 pack — relevant when using .035 wire on compatible Magnum PRO gun setups. Compatibility: Unknown (Verify).

Weld Support Parts Breakdown Reference

For parts-diagram confirmation, review the Lincoln Magnum 100L MIG gun parts breakdown. The breakdown lists the Magnum 100L K530-6 gun and includes KP35-40-15 in the liner section. Weld Support Parts also lists a Magnum PRO 100L breakdown with KP35-40-15 in the liner section. Use these pages for technical support and parts identification only; use Arc Weld Store for the product order link.

Common Applications

• Repairing poor wire feed on compatible Lincoln-style MIG guns.
• Replacing a liner after rusted or dirty wire has contaminated the conduit.
• Changing back to small wire after a gun has been set up with a larger liner.
• Preventing downtime on shop MIG guns used for light fabrication and repair.
• Supporting .023-.035 in. MIG wire applications where gun and liner fitment are verified.

Shipping / Returns Notes

Arc Weld Store lists this item as typically shipping within 1–2 business days, shipping from Corydon, Indiana, with free ground shipping to the lower 48 on qualifying orders. Returns are listed as accepted on unused items in original packaging. Arc Weld Store also advises contacting sales@arcweldinc.com with the part number, equipment model, and application before opening an incorrect item.

FAQ

What is M16291-2 used for?

M16291-2 is a replacement .023-.035 in. MIG gun liner for Lincoln-style MIG guns listed by Arc Weld Store, including Magnum 100L, Magnum PRO 100L, and Magnum PRO 175L.

What is the Lincoln cross-reference for M16291-2?

Arc Weld Store lists Lincoln xref KP35-40-15 for M16291-2.

What is the Tweco cross-reference for M16291-2?

Arc Weld Store lists Tweco xref 35-40-15 for M16291-2.

Will this liner fit a Magnum 100L gun?

Arc Weld Store lists Magnum 100L fitment. Confirm your exact gun model, lead length, and liner cross-reference before ordering.

Will this liner fit a Magnum PRO 100L or Magnum PRO 175L?

Arc Weld Store lists Magnum PRO 100L and Magnum PRO 175L fitment. Verify the gun model and the KP35-40-15 cross-reference before ordering.

Can I use this liner for aluminum wire?

Aluminum wire compatibility is Unknown (Verify). The product page does not identify this as a Teflon or aluminum-specific liner.

Should I replace the contact tip when replacing the liner?

Inspect the contact tip during liner replacement. A worn, oversized, clogged, or incorrect contact tip can cause feed issues even after a new liner is installed. Confirm tip series and wire size before ordering tips.

Safety Notes

• Turn off and disconnect welding power before servicing the MIG gun.
• Allow the gun, nozzle, diffuser, and contact tip to cool before handling.
• Trim and deburr the liner carefully to avoid wire shaving and feeding problems.
• Wear eye protection when cutting liner material or clearing wire from the gun.
• Follow the welder manufacturer’s manual, MIG gun documentation, OSHA requirements, AWS safety guidance, ANSI Z49.1, and employer lockout/tagout procedures.

Sources Checked

• Arc Weld Store product page for M16291-2 Lincoln Style Replacement Liner .023-.035 – Arc Weld by Masterweld.
• Arc Weld Store related product pages for M16291-1, Lincoln Electric K4528-1 Magnum PRO 100L MIG Gun, Lincoln S19725 Trigger Switch, and Lincoln KP2744-035T contact tips.
• Lincoln Electric KP35-40-15 cable liner manufacturer listing.
• Weld Support Parts Lincoln Magnum 100L K530-6 breakdown.
• Weld Support Parts Lincoln Magnum PRO 100L K3080-1 breakdown.
• OSHA welding, cutting, and brazing safety references.
• AWS welding safety resources and ANSI Z49.1 safety references.

End CTA: Ready to verify the cross-reference and order the liner?

The fast check is to remove the contact tip, straighten the gun cable, and jog wire through the gun. If feed improves with the tip removed, replace the contact tip first. If feed still drags, pulses, shaves, or stops with the tip removed, inspect or replace the liner. If the issue only appears when the gun lead is bent, the liner or cable path is the likely restriction.

For related feed-path troubleshooting, compare this guide with MIG wire feed stuttering fixes, MIG wire feed slipping troubleshooting, MIG contact tip burnback troubleshooting, and the Lincoln MIG gun selection chart.

Common Symptoms

Compatibility Notes

Lincoln Magnum PRO liners are not universal across every gun. Magnum PRO 100L, PRO 175L, 250L, PRO 250L, Curve, Barrel, HDE, AL, and fume guns use different liner paths and expendable systems. The Lincoln parts guide lists Magnum PRO 100L and 175L liners such as KP35-40-15 for 0.023–0.035 in steel wire, KP45-40-15 for 0.035–0.045 in steel wire, and KP1959-1 for 0.035 in aluminum wire on 15 ft guns. It also notes aluminum wire has a recommended maximum cable length of 10 ft for that setup.

For WSP breakdown verification, compare the installed gun to the Lincoln Magnum PRO 100L K3080-1 breakdown, Lincoln Magnum 100L K530-6 breakdown, and Lincoln Magnum 250L breakdown. The Magnum 250L page lists liner assemblies by wire range, including 0.025–0.030, 0.030–0.035, 0.035–0.045, and 0.035–3/64 in Teflon aluminum options. Verify before ordering.

What To Verify Before Ordering

• Actual gun model, not just welder model.
• Gun length: 10 ft, 15 ft, 25 ft, or other.
• Wire diameter: 0.023, 0.030, 0.035, 0.040, 0.045, 3/64, 1/16, or larger.
• Wire type: solid steel, stainless, flux-cored, aluminum, or hardfacing wire.
• Liner type: steel liner, Teflon/PTFE, or application-specific conduit.
• Front-end system: contact tip, diffuser, nozzle, and gun tube style.
• Backend connector and feeder adapter if the gun has been changed.

Inspection Steps Before Replacement

1. Disconnect input power. Do not service the feeder or gun with the machine energized.
2. Remove the wire spool tension from the gun path. Clip the wire and pull contaminated wire out carefully.
3. Remove the nozzle, diffuser if required, and contact tip. A packed tip can mimic a bad liner.
4. Jog wire with the tip removed. If feed is still rough, the restriction is upstream of the tip.
5. Straighten the gun cable. Tight loops make liner drag worse and can hide a kinked liner.
6. Inspect drive-roll pressure. Excess pressure can flatten wire and fill the liner with shavings.
7. Blow out the liner only if it is serviceable. Use clean dry air from the feeder end toward the front end. Replace if rust, copper dust, aluminum shavings, or heavy debris remains.
8. Replace the liner if kinked, worn, contaminated, or wrong size. Replacement is usually faster than trying to save a damaged liner.

Basic Replacement Procedure

1. Confirm the replacement liner part number against the gun model, cable length, and wire diameter.
2. Lay the gun cable as straight as possible on the bench or floor.
3. Remove the contact tip and front-end parts required by that gun design.
4. Remove the backend liner retaining nut, set screw, or connector hardware according to the gun manual.
5. Pull the old liner out from the rear of the gun. If it binds hard, stop and inspect for cable damage.
6. Feed the new liner through the rear of the gun with the cable straight. Do not force it through a kink.
7. Seat the liner fully at the backend and reinstall retaining hardware.
8. Trim the liner only according to the gun instructions. A liner cut too short can create feed gaps; a liner left too long can buckle or bind.
9. Reinstall diffuser, contact tip, nozzle, and wire.
10. Set drive-roll pressure to the minimum tension that feeds consistently without slipping or flattening wire.
11. Test-feed with the gun straight, then with a normal working bend.

Field Fix vs Proper Fix

Common Wrong-Part Mistakes

• Ordering a liner by wire diameter but not gun length.
• Ordering by POWER MIG or welder model instead of the installed Magnum gun model.
• Using a steel liner for aluminum wire when the setup needs Teflon/PTFE or spool-gun style support.
• Installing a 0.035–0.045 liner for 0.030 wire and creating feed instability.
• Cutting the liner too short at the front end.
• Replacing the liner but leaving a worn contact tip, wrong drive roll, or over-tight spool brake in service.

Related Failure Paths

• Contact tip burnback from slowed wire delivery.
• Birdnesting from liner drag or excessive drive-roll pressure.
• Arc sputter from inconsistent wire speed at the puddle.
• Porosity from loose gun seating or gas-flow disruption during service.
• Aluminum wire shaving from wrong liner or roll pressure.
• Drive motor strain from a blocked liner or spool brake drag.

Safety Notes

• Disconnect input power before servicing the gun, feeder, or drive rolls.
• Wear eye protection when clipping wire or blowing debris from a liner.
• Do not point the gun at yourself or another person while jogging wire.
• Replace damaged gun cable assemblies instead of forcing a liner through a crushed cable.
• If feed remains erratic after liner, tip, drive-roll, and spool checks, have the welder inspected by a qualified service technician.

Sources Checked

• Lincoln Electric 2024 Expendable Parts Guide.
• Weld Support Parts Lincoln Magnum PRO 100L, Magnum 100L, and Magnum 250L breakdown pages.
• Weld Support Parts Lincoln gun selection chart.
• Weld Support Parts MIG liner, wire feed stutter, wire feed slipping, and burnback support pages.