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Gunsmithing what size end mill

anyone know the perfect size endemill for the anschutz rail ? ordered the rail n wanted to make sure i had the right endmill

Sure you're asking about an end mill, or some other cutting tool? If you meant an end mill for cutting a simple slot; you don't want the "perfect size", you want something undersized. Rough out the slot, then use a small finish pass on each side to clean it up to the dimensions you need.
 
i just used a 3/8 4 flute endmill to mill out the pocket for my accessory rail.....dont need anything fancy
 
Sure you're asking about an end mill, or some other cutting tool? If you meant an end mill for cutting a simple slot; you don't want the "perfect size", you want something undersized. Rough out the slot, then use a small finish pass on each side to clean it up to the dimensions you need.

The ends are radiused.
 
That makes sense. On this, or any other part, if you don't know the radius the best way to figure it out is with a set of radius gauges. Assuming you don't have those, print out a picture with a bunch of concentric circles, and lay the part on the picture to use as a radius gauge. A quick Google Image search for "concentric circles" gives a bunch of options to choose from.
 
got the rail and have a couple more questions what would be a good compound to till the old tnuts with? once they r filled would it be about to drill near them for a new nut or would i have to stay a certain distance away?