drift out with punch from left to right, muzzle pointed away from you.
Start with gunpartscorp.com then eBay and auctionarms.com
Most came with a tooth ramped iron sight.But there could be different styles depending on the age of your Winchester model 1894 rifle,such as a peep sight,a full buckhorn sight,etc.
The standard mod 70 had a Winchester bead front sight on a ramp base with a sight cover. The standard rear sight was a Winchester 22G open sight. The rifles chambered for .375 H&H Mag had the Lyman 6W folding rear sight. Model 70 National Match (chambered for .30-06 only) had a Lyman No. 77 front sight on a forged ramp sight base and a Lyman No. 48WH rear sight. All receivers were tapped and drilled for popular scope and iron sights. The Model 70 Super Grade had a Redfield full gold bead front sight on a ramp with sight cover and a Winchester 22G open rear sight. (with acknowledgement to The Gun Digest, seventh edition, 1953)
Use a punch and tap it across the barrel. Its a dove tail joint.
Yes, the Winchester Model 1894s were factory-installed with various brands of sights over the years. The most common factory sight was the Winchester "semi-buckhorn" rear sight, but other options included a flat-top rear sight and a front bead sight. Additionally, some models were equipped with specialized sights for hunting or target shooting, depending on the configuration and year of production.
Requires professional appraisal.
To remove the rear sight from a Marlin Model 75, first ensure the firearm is unloaded and safe to handle. Locate the screws securing the rear sight to the receiver; typically, there are two screws on either side. Use a suitable screwdriver to carefully remove these screws. Once the screws are out, gently lift the rear sight off the dovetail or mounting area.
adjust rear sight up for distance
Unless a different sight was special-ordered, it would have come with the Series 26 rear sight, which was made in-house by Winchester. sales@countrygunsmith.net
the Winchester 1890 is a fine 22 cal plinker. check with 'Gunbrokers.com' and look under winchester 1890 model for sale price
I would start my search at numrich gun parts corp.They can be found on the web.
You will need the help of a gunsmith.