M1 Garand family: root rifle and variants, figure by figure

The M1 Garand is the root design for this family comparison. Introduced in 1936¹ and discontinued in 1957, it sets the baseline figures against which the later catalogue variants can be read: 4,370 g empty weight, 1,107 mm overall length, a 610 mm barrel, an 8-round internal magazine, 853 m/s muzzle velocity, 3,550 J muzzle energy, 402 m effective range and 3,200 m maximum range.

Those figures matter because the family changes only selected parts of that baseline. The later sniper and select-fire entries keep the same chambering, .30-06 Springfield, rather than moving to a different cartridge. In the cartridge record, .30-06 has a 63.35 mm² case length and an 84.84 mm overall length. Those dimensions help explain why the rifles in this family remain full-length arms even when their roles diverge.

This section therefore reads the family from the base rifle outward: first the standard M1, then the sniper variants, then the T20. The aim is narrow and factual. It is to show which figures stay fixed across the family, such as barrel length and chambering, and which figures move, such as weight, overall length, magazine capacity and stated effective range.

What the base rifle established

What the later variants inherit is the M1’s basic engineering package: a gas operated long stroke action, a hammer fired mechanism, a steel receiver, a steel barrel, a wood stock and a parkerised finish. Those features define the family more clearly than any single role-specific alteration, because they remain the common structure beneath the sniper and experimental branches.

The historical baseline is also clear in the Springfield Armory record: "By 1932, John Garand, a Springfield Armory engineer, developed a new rifle that would be adopted as the M1. The M1 rifle went into production in 1936" (source). In catalogue terms, that root design is the M1 Garand, introduced in 1936¹ and later discontinued in 1957.

Why this matters for the family comparison is straightforward. The root rifle was not a minor trial arm but a standardised service pattern with an estimated 5,500,000 produced and 16 catalogued users. That scale helps explain why later variants tend to modify fittings, sighting arrangements or feeding details rather than replace the underlying mechanism and materials. The family starts from a mature production rifle, not from a loose set of experiments, and the figures that follow are best read against that established baseline.

Sniper conversions: M1C and M1D

The M1C Garand Sniper and M1D Garand Sniper stay close to the M1 Garand baseline in the main ballistic and handling dimensions recorded by the catalogue. Both sniper variants keep the 610 mm¹ barrel, 8 round capacity and 853 m/s muzzle velocity of the base rifle. Their overall length is 1,103 mm, which is 4 mm³ less than the M1 Garand’s 1,107 mm. Their empty weight rises to 4,760 g⁴, 390 g above the base rifle’s 4,370 g, as the chart below shows. Both also carry a stated effective range of 600 m, against 402 m for the standard rifle, a difference of 198 m.

What separates the two is not calibre or barrel length, but the way the optical sight was fitted. The M1C catalogue description states that it used a Griffin and Howe side mounted scope base, drilled and tapped into the receiver, for M73, M81, M82 or M84 sights. The M1D is recorded as the later simplification, using a Springfield Armory single ring scope mount attached to the barrel rather than to the receiver.

In catalogue terms, these are conservative conversions. The core Garand pattern remains intact, while the sight mounting method is the main recorded distinction between M1C and M1D.

Source: GET /v1/firearms/compare?ids=m1-garand,m1c-garand-sniper,m1d-garand-sniper,garand-t20

The data in this chart

Firearm	Empty weight (g)
M1C Garand Sniper	4,760
M1D Garand Sniper	4,760
M1 Garand	4,370
Garand T20	4,360

The T20: capacity and length changed most

The Garand T20 is the family member that departs furthest from the standard M1 Garand in feeding arrangement and overall size. Its catalogue record gives an overall length of 1,226 mm⁵, against 1,107 mm¹ for the M1 Garand, a difference of 119 mm³. At the same time, the barrel remains 610 mm, matching the base rifle and the rest of the family, as the chart below shows.

The larger change is in magazine system. Where the M1 Garand uses an 8-round internal magazine, the T20 is recorded with a 20-round magazine. Its catalogue description identifies the mechanism behind that change: it "fed from detachable 20-round Browning Automatic Rifle (BAR) magazines". That is the clearest recorded shift in how any Garand-family variant stores and feeds ammunition.

Other figures stay closer to the root pattern. The T20 keeps the same .30-06 Springfield chambering and the same recorded muzzle velocity of 853 m/s as the M1 Garand. Its stated effective range is 500 m, which is 98 m above the M1 Garand's 402 m.

The empty weight is recorded as 4,360 g, but that figure is under review in the catalogue. It is best treated here as the recorded value only, not as a basis for a broader conclusion about the variant.

Source: GET /v1/firearms/compare?ids=m1-garand,m1c-garand-sniper,m1d-garand-sniper,garand-t20

The data in this chart

Firearm	Barrel length (mm)
Garand T20	610
M1 Garand	610
M1C Garand Sniper	610
M1D Garand Sniper	610

One cartridge, several roles

What stayed constant across the family was the chambering. The M1 Garand, M1C Garand Sniper, M1D Garand Sniper and Garand T20 are all recorded in .30-06 Springfield. That matters because it separates changes in role and configuration from changes in ammunition. In catalogue terms, this is one rifle family developed around one service cartridge.

The cartridge record sets the common baseline: 7.82 mm² bullet diameter, 11.66 g typical bullet weight, 880 m/s typical muzzle velocity, 4,515 J typical muzzle energy and 405 MPa maximum pressure. Its dimensions also frame the size of the rifles built for it, with a 63.35 mm case length and 84.84 mm overall cartridge length.

Against that cartridge baseline, the family entries show notable consistency. The M1, M1C, M1D and T20 are each recorded at 853 m/s¹ muzzle velocity. The shared figure does not mean the rifles are identical in every respect, because the family still divides into the standard rifle, two sniper variants and the T20 experimental rifle. It does show that the catalogue records these variants as adaptations of the same .30-06 system, not as redesigns around a different chambering.

How to close the comparison

The comparison closes cleanly once the family’s fixed elements are separated from its recorded departures. Across all 4 catalogue entries, the barrel length stays at 610 mm¹, and all 4 are chambered for .30-06 Springfield. Capacity also remains unchanged in 3 of the 4 rifles: the M1 Garand, M1C Garand Sniper and M1D Garand Sniper all retain the 8-round arrangement.

The main variant-specific changes are narrow and measurable. The M1C and M1D each rise from 4,370 g to 4,760 g⁴ empty, an increase of 390 g³, and each moves from a stated effective range of 402 m to 600 m, a difference of 198 m. The Garand T20 changes the family pattern more visibly in layout terms: its recorded magazine capacity is 20 rounds⁵, and its overall length is 1,226 mm, which is 119 mm longer than the base rifle. Its recorded empty weight is 4,360 g, though that figure is under review in the catalogue and should be read as recorded rather than decisive.

As one summary source puts it, "Variants Notable series variants as part of the M1 Garand" (source). The figures support that restrained view: one root rifle, then a small set of role-specific alterations around it.

For the full record, see the M1 Garand catalogue page.

Materials and densities

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.

Footnotes

1. GunSpec catalogue record for the M1 Garand, which cites militaryfactory.com, britannica.com, globalsecurity.org, gundata.org. In the API: firearms reference. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

2. GunSpec catalogue record for the .30-06 Springfield, which cites en.wikipedia.org. In the API: calibers reference and ammunition reference. ↩ ↩²

3. Method, comparisons: a difference is one catalogue figure minus another of the same kind, in the same unit. Comparisons. ↩ ↩² ↩³

4. GunSpec catalogue record for the M1C Garand Sniper, which cites thearmorylife.com, americanrifleman.org, snipercentral.com, en.wikipedia.org. In the API: firearms reference. ↩ ↩²

5. GunSpec catalogue record for the Garand T20, which cites nps.gov, smallarmsreview.com, gunsamerica.com. In the API: firearms reference. ↩ ↩²