S.Pz.B.41 (28/20 mm)

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The 28/20 mm S.Pz.B.41 on the Sd.Kfz.221 (s.Pz.B.41).


The 2.8/2 cm S.Pz.B.41 (Full designation: schwere Panzerbüchse; English: heavy tank hunting rifle) is a German anti-tank gun that utilizes a squeeze-bore principle for the projectile's kinetic energy. The squeeze-bore principle has a varying barrel diameter from the chamber to the muzzle, which "squeezes" the projectile as it propels through the "bore" in order to obtain a higher muzzle velocity. This results in the strange calibre naming for the weapon, which starts at 28 mm diameter at the chamber that steadily decreases to 20 mm by the muzzle end.

Vehicles equipped with this weapon

General info

The 2.8/2 cm S.Pz.B.41 is hindered by the fact that it only has one type of ammunition available in-game, the Pzgr.41 APCR ammunition. However, the squeeze-bore principle does indeed propels the ammunition at an extremely high velocity of 1,400 m/s

Available shells

Penetration statistics
Ammunition Type of
Penetration in mm @ 0° Angle of Attack
10m 100m 500m 1000m 1500m 2000m
2.8/2cm Pzgr.41 APCR 95 94 66 38 15 8
Shell details
Ammunition Type of
in m/s
Mass in kg
Fuse delay

in m:

Fuse sensitivity

in mm:

Explosive Mass in g
(TNT equivalent):
Normalization At 30°
from horizontal:
0% 50% 100%
2.8/2cm Pzgr.41 APCR 1,400 0.14 N/A N/A N/A +1.5° 66° 70° 72°

Comparison with analogues

As of Update 1.87, the S.Pz.B.41 is a one-of-a-kind squeeze-bore weapon in the game that presents high velocity and penetration for the calibre.

A captured S.Pz.B.41 in the hands of an Englishmen during the North African campaign.

A similar weapon that retains a "lightweight" construction and small-calibre shell is the Italian Fucile Controcarri S Mod.39 anti-tank rifle inside the L3/33 CC.

However, in terms of a weapon that have similar penetration power as the S.Pz.B.41 is the British 40 mm OQF 2-pounder, with the Shot Mk.1 APCBC/T that can penetrate 96 mm at point-blank range at perpendicular armour. The firepower parity at such a difference of calibre is testament on just how much faster the S.Pz.B.41 shell is going due to the squeeze-bore princple.

Usage in battles

Describe the cannon/machine gun in the game - its distinctive features, tactics of usage against the main opponents. Please don't write a "guide" - do not impose a single point of view, but give the reader food for thought.

Pros and cons

Summarize and briefly evaluate the weaponry in terms of its characteristics and combat effectiveness. Mark pros and cons as a list.




Examine the history of the creation and combat usage of this weapon. If the historical reference turns out to be too big, take it to a separate article, taking a link to an article about the vehicle and adding a block "/ History" (example: https://wiki.warthunder.com/(weapon-name)/History) and add a link to it here using the main template. Be sure to reference text and sources by using <ref>, as well as adding them at the end of the article.


An excellent addition to the article would be a video guide, as well as screenshots from the game and photos.

See also

Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:

  • reference to the article about the variant of the cannon/machine gun;
  • references to approximate analogues by other nations and research trees.

External links

Germany tank cannons
20 mm  KwK 30 L/55 · KwK 38 L/55 · Rh202
28/20 mm  s.Pz.B.41
37 mm  KwK 34(t) L/40 · KwK 36 L/45 · KwK 38(t) L/47
47 mm  Pak(t)(Sf.)
50 mm  KwK 38 L/42 · KwK 39 L/60 · PaK 38 L/60
57 mm  Bofors L/70 Mk.I
75 mm  K51 L/24 · PaK 39 L/48 · PaK 40/3 L/46 · PaK 42 L/70 · StuK 37 L/24 · StuK 40 (L/43 & L/48)
  KwK 37 L/24 · KwK 40 (L/43 & L/48) · KwK 42 L/70 · KwK 44 L/70 · KwK 44 L/36
76 mm  Pak 36(r) L/48
88 mm  Flak 41 · KwK 36 L/56 · KwK 43 L/71 · PaK 43 L/71
90 mm  BK 90
105 mm  FMK.4 Modelo 1L · K.18 L/52 · KwK L/68 · L7A3 · StuH 42 L/28
120 mm  Rheinmetall L44
128 mm  KwK 44 L/55 · K.40 · PaK 44 L/55
150 mm  sIG 33 · StuH 43 L/12