www.gunsamerica should be able to help
the model 42 is the same as the marlin model 80
type in marlin model 80 on google..its the same clip
The Marlin 780 dosent use a clip, it uses a magazine. You can get these from aimsurplus.com
The Marlin Model 795 rifle does not utilize clips, but has a 10-round detachable box magazine. The rifle itself has a magazine disconnect, and thus will not fire unless a magazine is inserted.
Try Numrich Gun Parts Corp.
Factory magazine for Marlin 80 DL $18 + $7 shipping at ammoclip.com
Magazines are available from Numrich gun parts for around $20 PLUS SHIPPING.
Numrich Gun Parts Corp.should be able to supply you with the magazine in question.
NUMRICH CORP. APROX. $15 EACH FOR A 10 SHOT CLIP NEW, If you need one get 2 just in case !!
Your rifle is a Marlin Model 70. Most gun shops can get a magazine for you- the same magazine is used for several Marlin 22s. You can also order one for $18.60 plus shipping from the website for gunpartscorp. It is Product No. 438340A.
best bet for older gun parts is gunbroker.com they sell most everything gun related