front sight

My 84 year old dad fell and broke off his front sight blade on his early 80's 7mm mag. I can't find what height is from the factory to order one shows 3 different ones. Does anyone know what I need to order?

A buddy of mine lives in Mexico and he doesn't have access to a good gunsmith. He has an old Stevens/Savage 87D and the front sight broke when it was accidentally dropped. We purchased a few replacement sights online but he is unsure how to remove the old broken one. The only replacement sights...

I tried searching for this but didn't find what I was looking for in the posts. I have a cheap 4-9x scope on my M4 and recently purchased a much nicer Mueller Speed Shot scope which is a 1-4x. I have not purchased mounting rings for it yet because Im not sure how high/low/forward I can place it...