I believe "No-Drill" is a relatively modern term applied to 'after-market' sights that did not require drilling & tapping of the Krag receiver (no gunsmith services needed to install).  It is good to recognize these sights, on altered or 'sporterized' Krags, in order to assess value and collectability.  (Extra non-arsenal holes lower the collector/salvage value).  The "no-drill" Krag sights commonly encountered are:  Model K1 Pacific, Model K2 Pacific (micrometer adjustments), Redfield No. 102K (Krag) and Redfield No. 70K (micrometer with either H=hunter or T=target knobs).  (Be advised that Redfield and other makers also made sights for the Krag that required drilling & tapping).  "No-Drill" sights routinely show up at gun shows, on ebay, and gunbroker.  If purchasing a Redfield model, make sure it has the longer than standard (replacement) side-plate screw or else you will have to make one!  Also, make sure it has the 'bracket' that hooks into the magazine cut-off opening (the magazine cut-off has to be removed for the Redfield and Pacific sights).  {My opinions and noted quirks of these "No-Drill" sights}:  Both of these brands of sights mount securely and work well.  The "micrometer" versions are a pain in the Axx;  there is no quick release for the elevation slide and the slide must be removed in order to take the bolt out of the rifle.  (It is probably faster to just take the whole sight off the Krag).  To have your Krag continue to feed smoothly with the Redfields, it is advisable to fill the empty magazine cut-off opening/slot with a properly oriented shaft, shaped like the shaft of the original cut-off.  The more basic Redfield #102K and K1 Pacific sights have elevation slides that are easily removed and set-screws that can retain the correct setting.  At least some, K1 Pacific sights, require a 'notching' of the stock in order to use lowest elevation settings;  this probably can be avoided by reshaping the bottom of the staff.

The Leroy Rice sight is often seen on Krag 'Deer Rifles'.  It apparently worked OK, but is a bit too crude for my liking.

[quote author=2F383921283F3E3F2C232A283F3E4D0 link=1377102600/0#0 date=1377102600]I believe "No-Drill" is a relatively modern term applied to 'after-market' sights that did not require drilling & tapping of the Krag receiver (no gunsmith services needed to install).  It is good to recognize these sights, on altered or 'sporterized' Krags, in order to assess value and collectability.  (Extra non-arsenal holes lower the collector/salvage value).  The "no-drill" Krag sights commonly encountered are:  Model K1 Pacific, Model K2 Pacific (micrometer adjustments), Redfield No. 102K (Krag) and Redfield No. 70K (micrometer with either H=hunter or T=target knobs).  (Be advised that Redfield and other makers also made sights for the Krag that required drilling & tapping).  "No-Drill" sights routinely show up at gun shows, on ebay, and gunbroker.  If purchasing a Redfield model, make sure it has the longer than standard (replacement) side-plate screw or else you will have to make one!  Also, make sure it has the 'bracket' that hooks into the magazine cut-off opening (the magazine cut-off has to be removed for the Redfield and Pacific sights).  {My opinions and noted quirks of these "No-Drill" sights}:  Both of these brands of sights mount securely and work well. 
The Redfield sights as shown do not have a pin as the Pacific appear to do to go into the cutoff area.  Are these sights complete or do they need the same kind of arrangement to mount?

Krag thread origins are a bit mystic (probably U.S. Military Arms threads were influenced by the French Arms of our early history that we copied).  5MadFarmers once gave an inventory of a 1902 Frankford Arsenal tap and die set.  The Krag side-plate screw and Krag rear barrel-band screw have 26 threads per inch.  I believe a .187 x 26 die was used.  You are not likely to find one at a hardware store.  The issue Krag side-plate screw is too short to reach the receiver threads with the added thickness of the Redfield sight.  I believe a Krag or 1903 Springfield rear barrel-band screw can be adapted, if the 'mushroomed' tip is filed to fit and the shank is reduced in diameter, so as not to prevent the threaded portion of the screw from entering deep enough.  (The Redfield screw I measured has an OAL = .561", length of shank = .470", max. thread & shank diam. = .180" and threaded portion of shank is approx. = .348")

So can I borrow a sling swivel screw from my other Krag and use it for the sight?  Then I would still need to turn a nail to fit the hole left by removing the cutoff?  Could you possibly shoot me a copy of the instructions for the sight?

butlersrangers wrote on Aug 24^th, 2013 at 4:05am:

Thank you for the information and your patients.