RGC Posted March 20, 2015 Share Posted March 20, 2015 Anyone have the STI/SVI and Tanfoglio hole locational dimensions? Namely the programmable distance from center from hole to hole? I will contact the mfr's directly but thought I'd throw out the question here firstly. Rob Link to comment Share on other sites More sharing options...
pxm142 Posted March 21, 2015 Share Posted March 21, 2015 Well the standard C-more 3 hole is .750" center to center, so the 5 hole that we all commonly use on STI/SVI is .375" from center to center, if that is what you are asking? Matt Cheely posted a drawing with all the frame dimensions on here somewhere but I can't find it! Link to comment Share on other sites More sharing options...
kneelingatlas Posted March 21, 2015 Share Posted March 21, 2015 Current Tanfoglios have four 4mm holes 10mm on center. Link to comment Share on other sites More sharing options...
echotango Posted March 23, 2015 Share Posted March 23, 2015 I believe the holes for an sti are also on a 1 deg slant. Link to comment Share on other sites More sharing options...
pxm142 Posted March 25, 2015 Share Posted March 25, 2015 I always wondered about that, is it the frame or the mount that is slanted? Don't some of the mounts also have some downward angle machined into them? Link to comment Share on other sites More sharing options...
echotango Posted March 25, 2015 Share Posted March 25, 2015 (edited) The frame has the slant. Edited March 25, 2015 by echotango Link to comment Share on other sites More sharing options...
Toolguy Posted March 25, 2015 Share Posted March 25, 2015 Current Tanfoglios have four 4mm holes 10mm on center. How far is the 1st hole center from the center of the slide stop hole and how far down from the frame rail to center of holes? Link to comment Share on other sites More sharing options...
bigcalidave Posted March 28, 2015 Share Posted March 28, 2015 Need a print for this, I was wondering the same thing, don't have another 2011 frame with optic mount holes to measure. Link to comment Share on other sites More sharing options...
jpl Posted March 29, 2015 Share Posted March 29, 2015 (edited) When I drill and tap a STI frame for a C-More I either start .635 from the front of the standard length dust cover to the center of the front hole or .500 from the center of the the slide stop hole to the center of the rear mount hole. I put them .135 down from the edge of the dust cover, straight. No 1 deg. slope. Haven't done that since the old Aimpoint mounts. Edited March 30, 2015 by jpl Link to comment Share on other sites More sharing options...
bigcalidave Posted March 30, 2015 Share Posted March 30, 2015 Thanks! Link to comment Share on other sites More sharing options...
Toolguy Posted March 30, 2015 Share Posted March 30, 2015 Many thanks JPL! Link to comment Share on other sites More sharing options...
KSwift Posted April 21, 2015 Share Posted April 21, 2015 What was/is the reasoning for the 1 degree slope? Link to comment Share on other sites More sharing options...
Toolguy Posted April 21, 2015 Share Posted April 21, 2015 The barrel is only parallel to the slide when the action is open. In battery the barrel is tilted down 1 degree, higher at the chamber, lower at the muzzle. Sights need to be parallel to the barrel. Iron sights have a higher rear and a low front and the slide is lower at the front too. A scope mounted parallel to the slide rails will run out of down elevation before the gun is sighted in. Therefore, the scope needs to be mounted at 1 degree down to the front to be parallel to the barrel when the gun fires. One degree at 25 yards is 15.7 inches. Link to comment Share on other sites More sharing options...
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