Actually this is a great concept. Iron sighted rifles are extremely handy, light, and hard to put out of order. My example is a pre 64 M70 featherweight. I put a Lyman 48 WJS on a pre 64 feather weight and what a fast and delightful rifle it is.
Lightweight is not an issue in today’s world were people ride everywhere. I understand in a bordering state you are allowed to shoot while sitting on your fourwheeler. This is another reason we are so fat, we don’t walk anymore. However, the WWII generation and earlier, they walked. They walked in the Infantry, they walked in and out to their hunting spot, and weight was a premium when you were the pack mule. Older rifles, such as my featherweight, are light for that reason.
Today’s rifles are heavy and bulk, because a motorized vehicle carries them.
Rifles built prior to the 60’s often were drilled and tapped for rear iron sights. Your best bet is finding an older commercial rifle built for irons and a scope. As in all things, you can see the transition from irons to optical only rifles. Rifles from the 50’s onward have provisions for scopes and irons, finally irons become vestigial, then are dropped altogether. The best rear sights for those older rifles are the Lyman 48 and Redfields. Those sights are collector items, costing over $100.00, sometimes a lot more.
Williams still makes iron sights, might check with them. Look at the rifles they are designed for, the curves of the sight base must be the same as the rifle receiver. If you buy a late model rifle such as a M70, you can find sights because the design goes back to the 30’s, but you will need to pay a gunsmith to drill and tap the receiver. Winchester stopped drilling their M70’s sometimes in the 50’s. Remington made a M721 before a M700. Might be able to find a drilled and tapped M721, this auction M721 shows factory rear receiver sight holes on the left side.
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=171595324
SAKO Finnbears had a special SAKO rear iron sight that fit over the rear dovetail. Sako's are great rifles and require an extra big bank account to buy.