IDPA bars full length dust covers whether cut for a searchlight rail or not.
Rails on short dust covers are OK if IF IF the gun makes the weight limit. And there are a lot of .45s out there with enough stuff added on to exceed the 41 oz weight limit for CDP.
USPSA has a limit on the length of a rail in Single Stack Division.
Other Divisions do not mention it.
NRA and CMP would not allow a rail in Service Pistol, but it would be ok in Centerfire or Big Bore.
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