Quoted:
knock the cross pins out of your FSB and take it off or move it back a bit so you can thread corretly
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Easier said than done apparently. I've tried on two SAR-1s now and neither pin would budge. I beat the hell out of one, but havent tried too hard on the other one because its NIB. I must be the most unlucky bastard with these things, I'm going to have to take it somewhere to be drilled out.
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Most of mine have come right out. On one, the rear one would come out, but the front one would not. On one, they actually tack welded the pin. A couple of ways to get them out.
A hefty 5/16" center punch to break the pin loose and then a smaller punch to drive it out. The 5/16" punch will appear to be to large but it is just used to break the cross pin loose and get it moving. It won't break/bend like a regular punch. I ruined several punches before trying this. If this doesn't work, use a mapp gas torch to heat the area and then use the center punch.
If there is a tack weld, grind it down, use the center punch to start it moving.
Still can't get it out? Center punch the pin, get a good set of drill bits, I used a 10 inch Ryobi drill press with the barrel in a vise on the press table and someone holding the rifle steady and drill the pin out with adequate lubricant. Make a new cross pin.
If you don't remove or move back the front site base a bit, your threads won't be right, most likely. With the pins out, I was able to take the front site base right off. On another rifle, I didn't bother to remove it, just tapped it back a bit to get that last turn with the threading die. Used a plastic mallet.