A Ruger SP is likely in my future. I learned of a series of books called IBOK’s ( Iowegan’s Books of Knowledge). They used to be available for. Introduction. The Ruger SP is a great revolver, but the factory double action trigger pull can be heavy and a bit rough. It can be improved with a “trigger job”. In the library they have DIY tutorials for Ruger revolvers called the “Iowegian book of Knowledge” (IBOK). They’re pretty informational and have.

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Place your left index finger in the trigger guard behind the trigger. It must be smooth or DA trigger pull will feel raspy. If it is rough, you will feel a gag in the DA stroke. Pull the center pin rod part 2 and center pin spring part 3 out from the front and the ejector part 58 out from the rear.

Trigger begins to move to the rear.

Ruger SP101 IBOK

Apply a drop of oil to the plunger. Many thanks for your time and info. Likely you will find scratches, machine marks and other cosmetic issues that have no affect on function.

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If initial timing is slow, the cylinder will try to rotate before it is released. Normal out-of-the-box SA trigger pull is 6 lbs. This will make the chamber mouth have somewhat of a cone shape and will allow ihok or semi-wadcutters to chamber without stubbing on the chamber mouths. Set the rest of the gun aside for now. Apply a few ibk of oil along the hammer spring.

Dress as necessary to remove sharp edges, rough spots, or residue. If the endshake test at the beginning was out of spec more than.

I will have to check which weights I used. If you choose a mainspring iblk than 12 lbs, you may experience light primer hits misfires and will have a much longer lock time. My truck driver brother was on this forum the other day and asks me daily if I have asked for this copy.

I got rid of the existing stock at local gun shows. On adjustable sight models, ibpk a proper fitting flat blade screwdriver in the windage screw part It will go on about half way before it contacts the plunger.

It should spin freely with no binds. There are only a few materials of real value and yours is number one!


Sorry for the Q, but what is an IBOK? – Ruger Forum

Getting the rugwr in place while assembling the revolver can be a challenge. Rugers are fantastic revolvers and will last forever. Make sure the retaining pin is flush on both sides. If not, force solvent into the firing pin hole and push the firing pin in multiple times to help clean out the firing pin and hole. If the plunger does not move freely, dress the hole some more. GPs with fixed sights are equipped with compact rubber grips with inserts.

Use a trigger pull test scale to measure SA and DA trigger pull weight.


Dec 27, Its robust design evolved from the older Security-Six series. Flame me if you will but it seems a matter of honoring another’s wishes to me. Trouble is, ibo, doesn’t seem to be available anywhere anymore.

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This guide will walk you through the process of completing a trigger job.