Start with gunpartscorp.com then eBay and auctionarms.com
The front sight is mounted on a "dove tail", you just tap it out of the notch in the ramp with a hammer and a punch or drift pin. The ramp is welded on, you cant take it off.
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)
I would start looking at Numrich Gun Parts Corp.They may be found on the web.Also check Brownells Gunsmithing catalog.
Winchester buckhorns often came with hoods. Look at the sides of the front sight ramp.Are there slots cut into the sides of the ramp? If there are, the sight originally came with a hood.
No. sales@countrygunsmith.net
Only 1 screw is visible, there are 2. Remove front sight hood, drive dove tail blade out from left to right. The other screw is visible now. Remove both screws and the ramp comes off.
The "P" designates peep rear sight & ramp front sight, not sure of the "G" designation.
Try e-gunparts.com
Some were, they had a folding rear sight and a ramp front sight on a 21" or 24" cylinder barrel. Other 67s had longer choked barrels
1. Remove the screw to the rear of the front sight ramp.2. Remove the "blade" from the front sight ramp.3. Remove the screw from the front of the front sight ramp (which was formerly seated under the "blade").
There are two screws securing the ramp to the barrel. One screw is quite obvious at the rear of the ramp. The other screw is under the front sight blade. Remove the front sight blade and you will be able to remove the mounting screw.
Some 1894's are equipped with a "Tang" sight, a post mounted behind the hammer with an aperture in it that flips up. These are generally set for long range shots (300-400 yards). The "iron" sights work just like any other. Line the front bead up between the horns on the rear and set it on the target. The saw toothed ramp under the rear sight can be slid forward raising the rear sight slightly. Each 'step' in the ramp represents a 100 yards increase in range. For shots 100 yards and under, you'd use the lowest step. For 300 yard shots, you'd slide the ramp up 2 more clicks to the 3rd step in the ramp. Adjusting these sights isn't easy. For instance, if the gun shoots to the left of your point of aim, you'll need to tap the rear sight to the right. It sounds easy enough, but you can't just go whacking away at it with a hammer. You'll need to set a block of hardwood or soft metal (brass is best) against the dovetail of the rear sight and set the gun on a stack of padding so you don't dent up the stock. Give the sight a couple of taps and try it out. It may take several trys to get it just right and you may end up going too far and have to tap it back some so don't go nuts pounding on it.