Mike: Those little burs are the result of someone using undersized wedge screw drivers. If you do play with gun screws and do not already have "hollow ground" turn screw tips, they are well worth the investment. A good set will have the right tip to completely fill the length of the slot and completely fill the width. Unless that is done, one risks twisting the driver out of the screw under torque and there's your bur. Do it a couple more times and you have the really buggered screws we have all seen.
Also, since you only have annoying tiny burs, a brass punch or maybe even a hard nylon punch might fix it for you with minimal likelihood of causing damage anywhere else.
Tap gently !!
Cheers,
Jack
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