Valuation Guides Machine Guns M3A1 'Grease Gun'
Published: May 26, 2025 | Updated: February 17, 2026
The M3A1 was an improved version of the original M3 'Grease Gun,' with simplified parts and better reliability in field conditions.
Curious about how much your M3A1 'Grease Gun' sub machine gun is worth? Whether you’re looking to sell or simply understand current pricing, we’ll help you assess the market value of your firearm.
The M3A1 was a streamlined redesign of the M3, introduced in 1944. It replaced the crank-style charging handle with a finger slot and widened the ejection port. Despite its minimalistic design, it remained in service for decades due to its ease of manufacture and performance in harsh conditions.
Origin
United States
Manufacturer
Guide Lamp (GM), Ithaca Gun Company, Medea Corp
Caliber
.45 ACP
Rate of Fire
450 rounds/min
Notable Uses
WWII (late), Korea, Vietnam, U.S. tank crews through the 1990s
Transferable M3A1 'Grease Gun' sub machine guns are highly sought after by NFA collectors and enthusiasts. Value is influenced by originality, condition, variant type and any unique historical markings. Most examples on the market range from $25,000 to $35,000, depending on configuration and provenance.
M3A1 (Guide Lamp, Ithaca)
Estimated Value: $25,000 – $35,000
M3A1 (Medea Corp)
Estimated Value: $25,000 – $35,000
Market values reviewed by Chris Wing, Lead Firearms Valuation Specialist
Originality:
Transferable M3A1 'Grease Gun's with original receivers, parts, and factory markings typically command higher prices due to their authenticity and appeal to collectors.
Condition:
Clean, well-maintained M3A1 'Grease Gun' machine guns in excellent mechanical and cosmetic condition will sell for significantly more than worn or modified examples.
Historical Markings / Provenance:
If there are markings or provenance that link your M3A1 'Grease Gun' to a specific military unit, wartime service, or historical event - collector interest and market value can greatly increase.
Restoration:
Whether your M3A1 'Grease Gun' has been refinished, restored or modified will significantly affect pricing. Original finishes are typically more desirable.
Transfer Status:
Transferrable M3A1 'Grease Gun's will hold a considerably higher value than their pre-86 or post-86 counterparts.
Receiver Type & Build Origin:
M3A1 'Grease Gun's built on original military receivers and parts are worth more than their post-war commercial counterparts, rewelds or REWATS.
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