Marlin model 80 DL

Hello all. Have a question. My stepson has a hand me down 22 cal. Marlin 80dl. The rifle has seen better days but were trying to fix her up. After a good cleaning its not that bad. When he shot it it would not extract the fired case. I asked him where the clip was and he told me that his dad had lost it years ago and just loaded it from the breach...AHHHH Iam thing that the extractor was crushed due to having to jump over the case rim. I was right a little bending and viola extraction ... OK were ordered a new one and also ordered a new ejector since that looked a little buggered up. Now the real question. From what I have found the 80 dl came with a peep site that mounts to the Reciver via two screw holes on the left side of the Reciver. This sight has been long gone. But the front site is not hooded which I've read that its supposed to have. It just had a raised blade in a ramp. We bought a buckhorn iron site but I notice that its a reverse dovetail on the barrel which will not let us mount the new site. Does the reverse dovetail on the barrel come out? Just so you know this is just a plinker for him and a first shooter so the iron sites should suit him well.I believe that all new shooters should start with irons. Red dots,Scopes should be used after the basics of marksmanship have been mastered. That's for any help......