MK II and MKIII Accurizing Kit Installation
Installation of the Volquartsen Accurizing Kit for the Ruger® MKII or MKIII. The Accurizing Kit combines all of the internal components needed for that crisp, clean 2.25lb trigger pull the discriminating shooter is looking for. No stoning or fitting required. Final trigger pull may vary slightly due to factory frame variances.
Before We Begin
- Always make sure the firearm is unloaded before performing any work it!
- Remove all ammunition from the work area before working on any firearms.
- Always wear safety glasses when performing any work on a firearm.
Please note that by installing the Volquartsen MK II Accurizing kit in a MKIII pistol, the factory magazine disconnect (parts 38 and 39 in the Ruger® schematic) will be removed. This will allow the pistol to fire without having a magazine inserted. It is the customer's responsibility to inform anyone using this pistol of this modification.
- Hammer or rubber mallet
- Needle nose pliers
- 3/32" Allen wrench
- 1/16" Allen wrench (included in kit)
- 1/8" pin punch
- Your Ruger® factory pistol manual, for reference
- A clean, non-slip surface, such as our Cleaning Mat
- All descriptions of the left or right side of the frame assumes that the frame is pointed down range, away from you.
- When referencing part diagrams, we generally list the part number for the target model pistol. In some cases, 22/45 pistols have parts with a different number.
- Verify, again, that the pistol is unloaded!
Remove the magazine from the frame and make sure there is no ammunition present in or near the pistol.
Remove the upper from the frame. Refer to the Ruger® manual if you need assistance.
If your pistol has removable grip panels, use a 3/32" Allen wrench to remove the grips from both sides of the frame. There are two screws in each side.
Take a moment to take a look at some of the details of your frame now, so that things look a little more familiar when it's time to reassemble.
- The orientation of the hammer (MKII part A01800, MKIII part 36) and hammer strut (MKII part A01000, MKIII part 36), in particular how the hammer strut rests on the mainspring (see circled area on picture).
- The orientation of the sear (MKII part A01901, MKIII part 42) and sear spring (MKII part A03100, MKIII part 41).
- The orientation and function of the safety (MKII part AN-53-100, MKIII part 35)
Remove the hammer pivot pin (MKII part A02605, MKIII part 49) by drifting it from right to left with a 1/8" pin punch. This will also allow you to remove the Bolt Stop Thumbpiece from the frame.
The hammer and disconnector (MKII part KA011, MKIII part 39) can now be slowly rotated up and forward on the frame. This will all you to remove the hammer, hammer bushing (MKII part A02505, MKIII part 40) from the pistol.
MKIII pistols will also have a magazine disconnector spring (part 39), and magazine disconnector (part 38) that can now be removed from the pistol.
With those parts removed, you'll also be able to remove the trigger spring plunger (MKII part A02508, MKIII part 29) and trigger spring (MKII part A20400 MKIII part 28)
Remove the safety from the frame.
Note: be careful not to lose the small plunger and spring that are inserted from the rear of the safety.
Remove the sear pivot pin (MKII part A02601, MKIII part 49) using the 1/8" pin punch. The sear and sear spring should now drop out of the frame.
Remove the trigger pivot pin (MKII part A03400, 34) by using the 1/8" pin punch to drift it from left to right. This pin is held in place by the trigger pivot retainer (MKII part KA04200, MKIII part 30) which may need to be pressed down slightly to allow this pin to be removed.
Remove the bolt stop (MKII part AN-37, MKIII part 31), bolt stop plunger (MKII part A04300, MKIII part 32), and bolt stop plunger spring (MKII part KA04600, MKIII part 33) by pulling it rearward.
Remove the trigger and disconnector.
Installation and Assembly
- Insert the pin on the disconnector into the right side of the new trigger.
- Install the trigger pivot pin from the right side of the frame and through the trigger.
- Install the bolt stop plunger and bolt stop plunger spring into the frame. The flat side of the bolt stop plunger should face the left side of the frame.
- Install the bolt stop into the left side of the frame. First, place the stop such that the stud on the side of the stop protrudes through the slot in the side of the frame. Then pivot it forward next to the flat side of the bolt stop plunger, until the holes line up with the trigger pivot pin. Once aligned, press the pin the rest of the way in.
- Ensure that the trigger pivot pin goes through both the trigger and the bolt stop.
- Insert sear pivot pin into frame from the left side approx. 1/8" and using a needle nose pliers set the sear spring onto the pin.
- The loop in the spring should face towards the front of the pistol.
- The long leg of the spring points into the large recess behind the magazine well.
- Using the needle nose pliers, position the Volquartsen sear and push the sear pivot pin through the sear and the other side of the frame.
- The sear needs to be positioned behind the short leg of the sear spring.
- Once properly installed, there should be spring pressure when pushing the sear forward.
Pre-assemble the hammer a hammer bushing by inserting the hammer bushing into the smaller hole on the right side of the hammer. These parts will be used again in Step 7, below.
- Make sure that the detent and spring are still installed in the safety.
- Insert the safety into the left side of the frame.
- Push the sear and safety forward slightly and pivot the safety down over the sear.
- The cutout in the safety should hook over the sear and hold it forward during this step.
- Continue to hold the safety in place for the next step.
- Install the Volquartsen extended bolt release by sliding the notch in the bolt release around the button on the bolt stop that protrudes through the side of the frame.
- Insert the hammer pivot pin far enough to hold the extended bolt release and safety in place. At this point, you should no longer need to hold the safety.
- Rotate the disconnector up and forward to expose the hole in the top of the trigger.
- Install the trigger spring and trigger spring plunger into the hole in the top of the trigger.
- Take the hammer assembly from Step 4 and insert it into the square hole in the disconnector from the left side.
- While holding the hammer assembly in the disconnector, rotate the assembly down into the frame until the hole through the hammer bushing aligns with the hammer pivot pin you installed in Step 6.
- Push the hammer pivot spring in the rest of the way.
- Make sure that the hammer strut moves freely behind the hammer.
Perform a function check on the frame. Pull the hammer rearward and it should latch in the cocked position. Pull the trigger and you should be able to pull the hammer forward.
Reinstall the grips on both sides of the pistol, if applicable.
- The top screw on the trigger is the pre travel adjustment screw.
- Put a drop of the included blue Loctite on the screw threads and turn in until there is about 1/16" of pre-travel.
- This is the practical minimum amount of pre-travel for the trigger. Some prefer to have more pre-travel, it's personal preference. If you attempt remove too much pre-travel, the trigger will not reset.
- The bottom screw in the trigger is the over travel adjustment screw.
- Put a drop of the included blue Loctite on the screw threads and set to personal preference.
- If you go too far, the hammer will not be able to release. The ideal setting, on most frames, is to have the screw just behind flush with the front face of the trigger.
- Cock the hammer and leave the safety off. Pull the trigger and the hammer should go forward.
- Cock the hammer engage the safety. Pull the trigger and the hammer should not move.
- If you are at all unsure about this procedure, have your frame checked by a qualified gunsmith.