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Rifles, Reloading, Optics, Equipment
Gunsmithing
HELP: Out of Windage - Scope Base Screw Hole Alignment Check?
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<blockquote data-quote="SidecarFlip" data-source="post: 698632" data-attributes="member: 39764"><p>In a nutshell.....Yes. </p><p> </p><p>I have the same scenario with a target pistol I own, the rail mounting threaded holes aren't parallel to the centerline of the chamber bore, creating an offset windage situation that causes offsetting of whatever sight I install, in this case a railway sight. </p><p> </p><p>I don't run out of windage because it's a target pistol and the range is 50 feet but it is a definite quality issue that the maker is going to address with a new receiver</p><p> </p><p>My misalignment is severe enough that I can visibly see the offset of the sight in relationship to the rail. At 50 feet, my issue is workable. Yours isn't.</p><p> </p><p>Just because both bases mounted to the receiver without an issue don't mean the mounting holes are on the same (exact) centerline in respect to the centerline of the chamber. Manufacturing tolerances in respect to the mounting holes and aftermarket rails will allow for substantial offset before binding or difficult insertion of the mounting screws would occur and it would be difficult at best for you ro ascertain if, indeed they are (or are not) simply because the barrel/receiver would have to be separated and the receiver fixtured and then the drilled and tapped holes gaged for parallelism and alignment in relationship to the chamber centerline, a job best left to the manufacturer in their QC lab.</p><p> </p><p>In my case, the chamber/receiver/barrel are one machined part, unlike your separate barrel/receiver.</p><p> </p><p>It's impossible to 'eyeball' alignment unless the alignment is so skewed that it's very obvious..... We all take for granted that the quality control of these firearms precludes just this, but it does happen.</p><p> </p><p>Keep in mind that the receiver is the BATF registered part (serialized) so replacement is going to entail a re-registering on the part of the manufacturer.</p><p> </p><p>Unless you have access to a machine shop or tool makers facility, gaging the parallelism of the mounting holes in relationship to the receiver/chamber centerline is beyond your (or most gunsmith's) capabilities. better left to the manufacturer.</p></blockquote><p></p>
[QUOTE="SidecarFlip, post: 698632, member: 39764"] In a nutshell.....Yes. I have the same scenario with a target pistol I own, the rail mounting threaded holes aren't parallel to the centerline of the chamber bore, creating an offset windage situation that causes offsetting of whatever sight I install, in this case a railway sight. I don't run out of windage because it's a target pistol and the range is 50 feet but it is a definite quality issue that the maker is going to address with a new receiver My misalignment is severe enough that I can visibly see the offset of the sight in relationship to the rail. At 50 feet, my issue is workable. Yours isn't. Just because both bases mounted to the receiver without an issue don't mean the mounting holes are on the same (exact) centerline in respect to the centerline of the chamber. Manufacturing tolerances in respect to the mounting holes and aftermarket rails will allow for substantial offset before binding or difficult insertion of the mounting screws would occur and it would be difficult at best for you ro ascertain if, indeed they are (or are not) simply because the barrel/receiver would have to be separated and the receiver fixtured and then the drilled and tapped holes gaged for parallelism and alignment in relationship to the chamber centerline, a job best left to the manufacturer in their QC lab. In my case, the chamber/receiver/barrel are one machined part, unlike your separate barrel/receiver. It's impossible to 'eyeball' alignment unless the alignment is so skewed that it's very obvious..... We all take for granted that the quality control of these firearms precludes just this, but it does happen. Keep in mind that the receiver is the BATF registered part (serialized) so replacement is going to entail a re-registering on the part of the manufacturer. Unless you have access to a machine shop or tool makers facility, gaging the parallelism of the mounting holes in relationship to the receiver/chamber centerline is beyond your (or most gunsmith's) capabilities. better left to the manufacturer. [/QUOTE]
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HELP: Out of Windage - Scope Base Screw Hole Alignment Check?
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