Yes, this has been suggested multiple times, but this is in the context of the recent Farquhar-Hill reward that has gotten some peoples’ attention. Between the 19 round magazine and 16.8 upgraded damage, these can be standard stats for BR 4 semi auto rifles, thus bridging the gap between BR 3 and 5 more evenly. I think these weapons make the most sense, in the context of trying to pick weapons as close to service as possible while also making sense from a gameplay progression perspective:
USSR: SVT 40-20
For those who don’t know, the SVT-40 and AVT-40 are nearly identical weapons, with the only difference being the fire selector behind the trigger. Thus, an SVT 40-20 is totally plausible.
USA: Winchester G30M 20 (M1940), or T1920 Garand
This is the same rifle on the BR 2 premium engineer squad, but with a 20 round magazine. This is different from the later Winchester G30R.
The other option is the T1920 Garand. This weapon, while being more closely related to the M1 Garand and T20, makes less sense in the context of a World War II shooter, and might make more sense as a Battle Pass weapon. Regardless, I felt it was worth mentioning since it’s the closest thing to a middle ground between the two weapons mentioned that I know of from the same weapons lineage.
UK/Commonwealth: Electrolux Charlton or SLR

This is a conversion of the Lee-Enfield to a semi-automatic rifle by the Electrolux company in Australia, unlike the other Charlton we are familiar with. This weapon still accepts Lee-Enfield magazines (depicted in images 1 and 2), including the 20 round trench magazine in the third image. It’s also the magazine featured on the Charlton in-game for some reason (the 30 round magazine should be a converted Bren magazine).

The other option is the Canadian SLR, developed by Small Arms Limited in response by the British in 1943 to develop a semi-automatic rifle based around the 7.92x57mm cartridge. It competed against the British/Belgian SLEM-1 and performed favourably to it, but was never adopted.
Germany: Gewehr 43 20
This is the same magazine found on the Gerat 03 premium rifle. It supposedly was used in small numbers in field trials.
Italy: Breda PG Carcano
I’m the least married to this one, since it already exists as a Battle Pass weapon, but I couldn’t think of a better option that might actually fire automatically, or simply didn’t have the magazine capacity. Also, since it fires 6.5mm, the damage could be reduced to 14.5 (Scotti Model X), and possibly have better stats in other categories. If there’s a better potential option here, please let me know about it!
Japan: ZH-29 20

When Manchuria was taken over by the Japanese in 1931, they had captured a decent number of Northern Chinese ZH-29 rifles, which became the basis of the Tokyo Gas & Electric rifle (Type Otsu). Thailand (formerly Siam) was also an ally of Japan, and participated in the Burmese campaign, who had purchased ZH-29s in 1931.
I’m open to hearing your guys’ thoughts on these suggestions! Thanks for reading.