Since i'm that kind of guy who tends to give suggestions to this Nation in some addons for HOI4 ill put my suggestion for its tech icons and make it look accurate as possible according to my research.

Small Arms:

1918: Mauser Model 1912.
Description: Introduced in 1912 to the Chilean Armed Forces, produced by both the FAMAE and Austrian Small Arms Manufacturer Steyr, despite they were put out of service later, they weren't given to the Carabineros.
Image: https://i.gyazo.com/2e88c73e81d3e0f3f892895e731d4d0e.png

1936: Mauser Model 1935
Description: Replacing the old Mauser Model from 1912, The new 1935 Model was made for the Border Patrol of Chile and Carabineros, yet they were used by the armed forces aswell.
Image: https://i.gyazo.com/edbbd14195223ccba62467ce1a289744.png

1939: Solothurn-Steyr S1-100 (MP34)
Description: Introduced in 1930 to the Chilean Armed forces, it's the first SMG to be ever used by the Chilean Military, it was used along with the Mauser Rifle by its troops.
Imagine: https://modernfirearms.net/userfiles/images/smg/smg81/steyr_mp34_1.jpg

1943: M1 Carbine
Description: Introduced in 1942, This being the first Semi/Full Automatic Carbine being used by the Chilean Armed forces.



Air Force:
(Fighters)
1933: Nieuport 17

1936: Bristol M.1

1940: Wibault Wib.7

1944: Republic P-47 Thunderbolt


Tanks:
(Light)

1934: Carden-Loyd Tankette

1936: M3 Stuart

1941: M24 Chaffee

(Medium)

1941: M4 Sherman