Good scope mount - Springfield Armory M1A 4th Generation Weaver-Style Scope Mount

You can still use the iron sights, but with a cheek rest installed it is hard to get a sight picture. Instructions don't mention using a mallet to install, and it is quite expensive (4 stars.) Very similar to the Sadlak mounts. Still, after about 100 rounds it will hold steady (after using a mallet to hit the cam washer in place.) It shot itself loose 3 times before I hammered it down. Now, it runs correctly.
Thanks,
-K