SGW Gunsmith
Member
All of the Ruger Mark I,II,III,IV, Standard and 22/45 use the very same trigger plunger spring. That specific spring does two things; it returns the trigger forward again, and it lifts the rear end of the disconnector, or as some call it, the "trigger bar", up and off of the sear. The factory spring supplied has been matched to work with the factory trigger and the factory disconnector, in kind.
Sometimes issues will arise when aftermarket parts, like the disconnector, replaces the factory disconnector for whatever the reason the owner chose. I've weighed every Mark pistol disconnector I could get ahold of, so that I had an idea of what the weight of those disconnectors actually are. WHY? Consider where the spring is located and that spring needs to lift the full length, and weight, of whichever disconnector is in use, so I wanted to know which disconnector weighed the most and which one weighed the least. So that spring, in use, would be sorta like us lifting up a 6-foort long 2X4 from only one end with all the weight forward:
Volquartsen Custom is the most prolific provider of aftermarket parts for the Ruger Mark pistols, and they do provide the heaviest disconnector available. they also provide a lighter weight trigger plunger spring with that part and the premise that it will reduce trigger pull slightly. Most owners find that it works best to use the factory trigger plunger spring because it's a bit stronger and will lift that long, heavier disconnector much better than the lighter spring Volquartsen provides.
Most folks don't know about the short lived aluminum disconnector that Volquartsen once tried. It didn't fair well when up against a hardened steel bolt slamming into it during the cycling sequence and therefore was dropped from production:
I've experimented with using a trigger pull gage to determine if the lighter spring does indeed reduce trigger pull weight to any degree, as compared to the factory spring. If there is a difference, my Lyman digital pull gage isn't able to detect any. So, ignoring any effect on actual trigger pull weight, instead, I started to experiment with trigger plunger springs a bit heavier that would lift that heavier Volquartsen disconnector in a snappier manner. The various springs are pictured below:
Sometimes issues will arise when aftermarket parts, like the disconnector, replaces the factory disconnector for whatever the reason the owner chose. I've weighed every Mark pistol disconnector I could get ahold of, so that I had an idea of what the weight of those disconnectors actually are. WHY? Consider where the spring is located and that spring needs to lift the full length, and weight, of whichever disconnector is in use, so I wanted to know which disconnector weighed the most and which one weighed the least. So that spring, in use, would be sorta like us lifting up a 6-foort long 2X4 from only one end with all the weight forward:
Volquartsen Custom is the most prolific provider of aftermarket parts for the Ruger Mark pistols, and they do provide the heaviest disconnector available. they also provide a lighter weight trigger plunger spring with that part and the premise that it will reduce trigger pull slightly. Most owners find that it works best to use the factory trigger plunger spring because it's a bit stronger and will lift that long, heavier disconnector much better than the lighter spring Volquartsen provides.
Most folks don't know about the short lived aluminum disconnector that Volquartsen once tried. It didn't fair well when up against a hardened steel bolt slamming into it during the cycling sequence and therefore was dropped from production:
I've experimented with using a trigger pull gage to determine if the lighter spring does indeed reduce trigger pull weight to any degree, as compared to the factory spring. If there is a difference, my Lyman digital pull gage isn't able to detect any. So, ignoring any effect on actual trigger pull weight, instead, I started to experiment with trigger plunger springs a bit heavier that would lift that heavier Volquartsen disconnector in a snappier manner. The various springs are pictured below:
