Sweedish Mauser / Rock-Island 1903 INFO?

[coastalnative]

I have these pieces and I was wondering if anyone could provide info. A Carl Gustafs Stats 1916 Upper with barrel, a 1903 Rock Island Arsenal Upper and a 1903 barrel (not sure if it matches the RI upper) I am looking to sell them ideally but I really don't know what I have here. Any info would help.. Thank you in advance
IMG_4356 Small.jpg IMG_4362 Small.jpg IMG_4358 Small.jpg IMG_4361 Small.jpg IMG_4359 Small.jpg

[GunDog]

Just be aware that any Rock Island 1903 with a serial number below 285,507 is considered a "low number" and was made of "single heat-treated" carbon steel. Some of those actions have been known to burst for no accountable reason when fired. Later 1903s dubbed "high number" were "double heat-treated" which resulted in actions (still made of carbon steel) being much stronger and safer than before.

[2761377]

the problem of M1903 receiver failures is highly overblown. in the first place, they only happened as a result of a cartridge case failure. full stop.
secondly, there were specific lots of WRA manufactured ammunition in 1917 that are suspected of being responsible for most of the M1903 problems.

[coastalnative]

Serial number as you can see in photos starts with 34*****