Rear site for Benjamin 342 serial number 234837 5.5mm

It's worth $335.

Try google

Reseal Repair Seal Kit for Benjamin 340 342 347 Air Rifles eBay

Benjamin 342 22 seal repairs Airguns Guns Forum

Benjamin pellet gun repair advice help needed

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Dear Aijaz Talpur,
I am Salman. Nice to see your question about bending barrels of Benjamin Franklin 342s airguns. I suggest you take the barrels to some Lathe Machine Expert (Kharadia). He will easily straighten them. I live in Nawabshah Sindh and have used a huge number of Diana, BSA, Crosman Benjamin and some pakistani airguns.

Please feel free to contact on 03018564852 for further help.

Regards
SALMAN

Springs tend to loose their performance after a few years is air rifles. Check also the seal/o rings on the piston rod and the blow hole. I found waxing it with Vaseline makes it last longer and seals more.

send it to your local gun store and see if they can fix it....

http://www.pyramydair.com/blog/2005/09/fix-your-benjamin-or-sheridan.html

I recently purchased a rebuild kit for my 342. I bought the kit from airgundepot. It was the kit for the
392 and I modified it a little. On the new plunger, you have to drill a hole in the center of it the same
size as the pin's smallest diameter. You can use all of the parts in this kit except for the small o-ring. I think it sold for about 39 dollars or so. My rifle was manufactured in 1972 and it fires like new.