The Stevens/Savage rifles came in several variations. Depending on the variant, these rifles were chambered in the following calibres:
.22 Hornet
.222 Rem.
.223 Rem.
.225 Win. cal.
.30-30 Win. cal
Barrel lengths were in 22 and 24 inches and all rifles were equipped from factory with open sights and a 4 or 5 shot mag. Rifles weighed in at approximately 7 1/2 lbs. and, for the most part, were equipped with a plain pistol grip stock.
Savage 340 family included the following variants:
The Model 340
The Model 340A
The Model 340B
The Model 340C
The EL 340C
The Model 340D
The Model 340 Series E
The Model 340V
The Model 340S Deluxe
The Model 342 (.22 Hornet only)
The Model 342A (.22 Hornet only)
The Model 342B (.22 Hornet only)
The Model 342S (.22 Hornet only)
Springfield
Model 840
Related Stevens models include:
The Model 322 (322A, 322B, 322C, 322S)
The Model 325 (325, 325A, 325B)
Other related models include"
The CIL Model 830
The following table lists serial numbers by date blocks from 1969. Pre-69 Savage rifles were serialized however they did not use a letter prefix. The following list includes the rifles made for retailers by Savage such as Sears and Westernfield however it is unknown if this includes the CIL 830 branded rifles.
The following information was copied from https://www.24hourcampfire.com
"Time for the annual lecture on 325/340 safety.
To prevent an accidental discharge, remove the action from the stock, throughly strip the grease from the trigger mechanism with GunScrubber or brake cleaner, oil lightly, and replace action.
The trigger mechanism is completely enclosed in a stamped steel housing which is integral to the workings of the trigger. The housing was packed with grease at the factory. 60 years later, in most cases that grease now has the consistency of taffy.
The bolt can also be packed with grease, so clean and oil that, too.
A friend and I go to the woods to target practice with my grandfather's 325A 30/30. Gramps bought it new from a hardware store, and shot at most a box of shells. I load it, hand it to my friend, who shoulders the rifle, aims, and pulls the trigger. Rifle does not fire. Oops, he did not take the safety off.
He brought the rifle to port arms, (bbl still pointed down range), rotated the safety rocker/lever to "Fire", and the rifle discharged. After unloading, I was able to reproduce the AD every time. After investigating, I could see that pulling the trigger with safety on "Safe" prevented the striker from dropping, but the taffy/grease held the sear back. When safety was set to "Fire", the complex trigger (sear) was back enough to release striker.
After cleaning trigger mechanism and bolt, and proper light oiling, the safety works as expected; no fire on "Safe", and rotating safety to "Fire" does not drop striker. My 340D had the taffy/grease, but did not reproduce the AD conditions. Maybe it was due to difference in design, or quantity of grease."