This concerns two MK III 22/45s. The first one I’ve had for about four years. It has a four inch barrel. Shortly after I purchased it I replaced the trigger, the sear and the hammer with VQ parts. Because of light strikes I eventually put the Ruger hammer back in. I also took out the mag safety and replaced it with a MK II bushing.
I decided I wanted a 5.5 inch barrel so I bought one. I took the frame from the old four inch with the VQ parts and mated it with the new 5.5 inch barrel and receiver. I put the old bolt and main spring housing assembly with the old barrel and receiver. I put the new bolt and main spring housing assembly with the 5.5 inch barrel, receiver and old frame and VQ parts.
Now on the new one when I release the slide release and the bolt goes home the gun fires. I’ve tried different combinations of bolts and main spring housings to no avail. Same thing happens. The old barrel/ receiver with the new frame on it works fine. I tried calling VQ but the young lady I spoke kept having to run back and ask someone questions and either I was conveying the problem accurately or she wasn’t. Any help or suggestions?
Bullseye, I hope you're looking
Moderators: Bullseye, Moderators
forgot to add
Before the old gun had a trigger pull of about 2 lbs. Now, the new combination has a trigger pull of a very few ounces. Barely takes any pressure to set it off. Found this out by putting a balnk shell in and with the safety on releasing the slide. Then it will go off until I release the safety and pull the trigger. Just a few ounces pressure is all it takes.
This sounds to me as if the old frame with the VQ parts has very little tension on the sear. Could be a negative engagement situation between the hammer and sear or the sear spring may be bent slightly out of alignment. The sear spring should be configured with the long leg parallel with the back side of the spring loop in a 22/45 spring. If it is leaning more forward there would not be very much tension on the sear to hold it against the hammer hook.
R,
Bullseye
R,
Bullseye
BudE is your firing pin protruding from the front of the bolt at all or is the hammer actually not engaging the sear or jumping off of the sear & striking the firing pin? A guy got shot at one of the local ranges here a few months back when a SKS went full auto & supposedly the inexperienced shooter freaked out & threw it on the ground & it spun around & shot the owner 2 or 3 times in the abdomen. It was an military surplus rifle & it wasn't cleaned before firing it when the state police inspected it they found the firing pin packed full of rock hard cosmoline. So if it's firing on its own be careful with it while your working on it & make sure it's never loaded up with a full mag until you get it figured out. When you get around to testing it out make sure you only load one at a time until its working properly. I'm not implying that you would be careless with it but we can't stress safety enough especially with a malfunctioning firearm. Be careful & good luck with it.
In youth we learn,
In age we understand.
In age we understand.
