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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.
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").
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
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)
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.
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.
Start with gunpartscorp.com then eBay and auctionarms.com
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.
Blue Book of Gun Values will assist you.
Depending on condition- $100-$125. 22 lr,l,s, 7 shot detachable magazine. 24" barrel. weight 6.5 lbs. Monte Carlo stock, checkered pistol grip and forearm, sling swivels. No. S320 ramp front sight, No. 4505 rear sight. 1972-1995.