The root of the family is the M1 Carbine, introduced in 19411. In catalogue form it is a gas operated short stroke carbine, chambered for .30 Carbine, with a 15-round detachable box magazine. Its recorded dimensions and weights set the baseline for the variants that follow: 2,480 g empty, 2,770 g loaded, 905 mm overall length and a 460 mm barrel.
The ballistic figures also establish the family’s common scale. The M1 Carbine is recorded at 607 m/s muzzle velocity and 1,311 J muzzle energy, with an effective range of 275 m and a maximum range of 1,829 m. Those numbers matter because most catalogued branches stay close to this pattern, so the main differences within the family are usually in configuration, controls or production history rather than calibre or ballistic class.
Historically, the M1 Carbine is also the reference point because of its production and service span. The catalogue records an estimated 6,500,000 produced, and U.S. service through 1973. As Pugsley later put it, “The carbine was invented by no single man,” (source) which fits the record here: a Winchester-led design that became a large family of closely related carbines rather than a single fixed pattern.
What stayed constant across most variants
Across the fixed-stock wartime contractor carbines, the catalogue records far more continuity than change. Standard Products, Rock-Ola, Saginaw, Quality Hardware and Irwin-Pedersen all match the root M1 Carbine in the main service figures that define the family’s ballistic class and handling envelope.
Each of those contractor variants is listed at 905 mm1 overall, with a 15-round detachable box magazine, 607 m/s muzzle velocity and 275 m effective range. All remain chambered for .30 Carbine and all retain the same gas operated short stroke action. In catalogue terms, that makes them manufacturing variants first, not separate mechanical branches.
The main dimensional difference is small. The Winchester-root M1 Carbine is recorded with a 460 mm barrel, while the contractor carbines are recorded at 458 mm. The chart below shows that this is a 2 mm2 difference across the compared set, not a broader redesign.
Weight also stays aligned in the records. The Winchester M1 Carbine is listed at 2,480 g empty, and the same figure appears for these contractor guns, although the catalogue marks several of those contractor weight entries as under review. Even with that caution, the overall pattern is clear: the wartime fixed-stock variants are distinguished chiefly by maker and procurement history, not by changed chambering, action or recorded ballistic output.
Barrel length, compared
The data in this chart
| Firearm | Barrel length (mm) |
|---|---|
| M1 Carbine | 460 |
| Irwin-Pedersen M1 Carbine | 458 |
| Inland M1A1 Carbine (Paratrooper) | 458 |
| M2 Carbine | 458 |
| Quality Hardware M1 Carbine | 458 |
| Rock-Ola M1 Carbine | 458 |
| Saginaw M1 Carbine | 458 |
| Standard Products M1 Carbine | 458 |
The lightest catalogued branch, the Inland M1A1
The Inland M1A1 Carbine (Paratrooper) is the lightest catalogued branch in this group. It was introduced in 19421 and adopted by the United States Army (Airborne) in 1942 as Carbine, Caliber .30, M1A1. In the catalogue family tree it appears as the paratrooper variant of the M1 line, rather than as a separate cartridge or action type.
Its recorded empty weight is 2,360 g3. That is 120 g2 below the 2,480 g figure for the root M1 Carbine. The chart below shows that difference clearly, and also shows that the M1A1 sits below the other fixed-stock wartime entries clustered at 2,480 g, while the M2 Carbine stands above them at 2,600 g4.
What did not change matters as much as what did. The M1A1 remains 905 mm overall, with a 458 mm barrel, a 15-round detachable box magazine, 607 m/s muzzle velocity and a 275 m effective range. In other words, the catalogue records the main distinction here as configuration and weight, not a change in chambering, action or ballistic class. That keeps the M1A1 close to the standard carbine in recorded performance while marking it out as the lightest branch in this comparison.
Empty weight, compared
The data in this chart
| Firearm | Empty weight (g) |
|---|---|
| M2 Carbine | 2,600 |
| Irwin-Pedersen M1 Carbine | 2,480 |
| M1 Carbine | 2,480 |
| Quality Hardware M1 Carbine | 2,480 |
| Rock-Ola M1 Carbine | 2,480 |
| Saginaw M1 Carbine | 2,480 |
| Standard Products M1 Carbine | 2,480 |
| Inland M1A1 Carbine (Paratrooper) | 2,360 |
The M2 Carbine, what changed in the select-fire model
The M2 Carbine, introduced in 19441, is the branch of the family where the catalogue records the clearest functional change while leaving most external dimensions close to the M1 Carbine. It keeps the same 905 mm overall length as the M1 record, with a 458 mm barrel rather than 460 mm. Its chambering remains .30 Carbine, and the recorded muzzle velocity and effective range stay at 607 m/s and 275 m.
What changes in the catalogue is weight and feed capacity. The M2 is listed at 2,600 g4 empty, which is 120 g2 above the M1 Carbine’s 2,480 g. It is also recorded with a 30-round magazine, compared with the M1’s 15-round magazine. That magazine-capacity figure matters because it marks the M2 out from the fixed-stock wartime contractor M1s, but the catalogue places the M2 capacity entry under review, so it is best read as the current record rather than as a basis for ranking.
In figure terms, then, the M2 is not a different ballistic class within the family. The recorded barrel length, muzzle velocity and effective range remain aligned with the M1 pattern. The catalogue distinction is that the M2 alters the operating role of the carbine while changing little in size.
Contractors, dates and what the records actually distinguish
The dates in the catalogue separate two different kinds of variation. The root M1 Carbine appears in 19411. The Inland M1A1 Carbine (Paratrooper) and Irwin-Pedersen M1 Carbine follow in 1942. Then come the wartime contractor M1 records in 1943: Standard Products, Rock-Ola, Saginaw and Quality Hardware. The M2 Carbine arrives in 1944.
That sequence matters because most of these entries are not separate ballistic classes. In catalogue terms, the 1943 contractor guns are chiefly production variants of the same M1 pattern, while the M1A1 and M2 mark clearer configuration changes within the family.
The contractor notes show why some names remain historically distinct even when the recorded dimensions and performance stay close. Rock-Ola is recorded at approximately 228,5005 carbines between 1943 and 1944. Quality Hardware is recorded at approximately 359,0006 between 1943 and 1944. Irwin-Pedersen is different again: roughly 3,5427 carbines were assembled, but none were accepted by the U.S. The distinction there is procurement outcome, not a recorded change in chambering, action or muzzle velocity.
The cartridge that ties the family together
The shared .30 Carbine cartridge is what makes the family comparison coherent. Introduced in 19401, it is a rimless, tapered-case round with a 32.77 mm8 case length, a 42.67 mm overall length and a 7.82 mm bullet diameter. The catalogue’s typical loading is a 7.13 g bullet at 607 m/s for 1,311 J.
Those figures match the recorded ballistic baseline of the root M1 Carbine, and they are carried across the catalogued family members discussed here. That matters because it separates changes in configuration from changes in cartridge class. In catalogue terms, the family does not divide into different calibres or different ballistic tiers. Instead, the visible differences are elsewhere: fixed stock against folding stock, 15-round magazine against the M2’s recorded 30-round4 magazine figure, and empty weight from 2,360 g3 to 2,600 g across the variants covered here.
The result is a family in which the main technical constants are chambering and external ballistics, while the main variables are layout and role-specific fittings. For the full record, start with the M1 Carbine catalogue page.
Materials and densities
| Part | Material | Density (g/cm³) |
|---|---|---|
| Frame | Carbon and alloy steel | 7.85 |
| Barrel | Carbon and alloy steel | 7.85 |
| Stock | Walnut | 0.61 |
Sources and methods
Figures under review. The catalogue's own data checks still question one figure in this post, given here as the record states it. How the data is checked.
| Task | Figure | Open question |
|---|---|---|
| View task | M2 Carbine magazine capacity | Outside the usual range for its kind |
Footnotes
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GunSpec catalogue record for the M1 Carbine, which cites en.wikipedia.org, militaryfactory.com, globalsecurity.org, modernfirearms.net. In the API: firearms reference. ↩ ↩2 ↩3 ↩4 ↩5 ↩6
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Method, comparisons: a difference is one catalogue figure minus another of the same kind, in the same unit. Comparisons. ↩ ↩2 ↩3
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GunSpec catalogue record for the Inland M1A1 Carbine (Paratrooper), which cites uscarbinecal30.com, americanrifleman.org, rjmilitaria.com, americanrifleman.org. In the API: firearms reference. ↩ ↩2
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GunSpec catalogue record for the M2 Carbine, which cites militaryfactory.com, globalsecurity.org, modernfirearms.net, americanrifleman.org. In the API: firearms reference. ↩ ↩2 ↩3
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GunSpec catalogue record for the Rock-Ola M1 Carbine, which cites crateclub.com, militaria-deal.com, blog.cheaperthandirt.com. In the API: firearms reference. ↩
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GunSpec catalogue record for the Quality Hardware M1 Carbine, which cites crateclub.com, militaria-deal.com, blog.cheaperthandirt.com. In the API: firearms reference. ↩
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GunSpec catalogue record for the Irwin-Pedersen M1 Carbine, which cites m1family.com, forums.thecmp.org, militaria-deal.com. In the API: firearms reference. ↩
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GunSpec catalogue record for the .30 Carbine, which cites en.wikipedia.org. In the API: calibers reference and ammunition reference. ↩
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