Reliability issues with customized MK4 22/45 lite - RimfireCentral.com Forums

Go Back   RimfireCentral.com Forums > > >

Join Team RFC to remove these ads.
Reply
 
Thread Tools Display Modes
  #1  
Old 11-30-2021, 05:03 PM
Mountainhunter76
US Navy Veteran NRA Member - Click Here To Join!

Join Date: 
Jan 2015
Location: 
Spokane,Wa
Posts: 
16
TPC Rating: 
0% (0)
Reliability issues with customized MK4 22/45 lite



Log in to see fewer ads
I have a MK IV 22/45 lite that I have customized pretty thoroughly and I am beginning to have reliability issues with. My issues are mostly FTF with the nose of the round jammed into the top of the chamber. The case ends up bent. Sometimes I will also have a FTE and I fire on an empty case. I'll squeeze the trigger and hear the click. Cycle the bolt by hand and the empty case ejects.
Mods that I have done are Volquartsen firing pin and extractor, adjustable recoil spring kit, Volquartsen magazine release,TK flat trigger, TK magazine green springs, Volquartsen and TK magazine base plates.I have tuned the magazines as per TKs youtube video. I am getting near my breaking point with this gun. I really like the utility of it, but the reliability is terrible. I have 5 mags that I've polished the hell out of and a gun that I've thrown a bunch of money in aftermarket parts at to no avail.
I shoot suppressed 100% and only cci standard velocity.
Any advice or suggestions on a reliable alternative?
Reply With Quote
  #2  
Old 11-30-2021, 08:59 PM
lasnyder
US Air Force Veteran NRA Member - Click Here To Join!

Join Date: 
Oct 2019
Location: 
New Port Richey, Fl
Posts: 
148
TPC Rating: 
0% (0)
I don't shoot suppressed, but did suffer some of the same problems, which I attributed to the bolt not cycling fully to the rear... enough to partially strip a cartridge and produce a feed way jam, and occasionally not resetting the hammer...

I solved my problem with the lightened recoil spring you have installed

a good friend had a similar problem, and traced his to having the trigger over travel screw and take up screw too light, with not enough engagement...

my problem was easily diagnosed by using high velocity CCI Blazer to provide more recoil energy... we swapped bolts between my MKIV Lite and his, mine with the lightened recoil spring installed... did not matter what ammo, so looked elsewhere... the adjustment of trigger stops (takeup and over travel) at this time seemed to have cleared up the problem...

make sure to lubricate the well the hammer main spring is located in... I run a drop of so down the strut every month or so

regards Les
Reply With Quote
  #3  
Old 12-01-2021, 12:03 AM
Mountainhunter76
US Navy Veteran NRA Member - Click Here To Join!

Join Date: 
Jan 2015
Location: 
Spokane,Wa
Posts: 
16
TPC Rating: 
0% (0)
Thank you for the feedback.
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old 12-01-2021, 07:18 AM
Mike_AK
US Air Force Veteran NRA Member - Click Here To Join! GOA Member

Join Date: 
Feb 2007
Posts: 
4,096
TPC Rating: 
100% (3)
Sounds like the cartridge is not sliding up the bolt face under the extractor like it is supposed to causing the bullet to feed nose high. Try reinstalling the Ruger extractor and see how that works. I'd also try some fresh unmodified magazines.
Reply With Quote
  #5  
Old 12-01-2021, 12:47 PM
Test_Engineer

Join Date: 
Nov 2014
Location: 
On a Colorado glacier
Posts: 
3,112
TPC Rating: 
0% (0)
Mike has some good suggestions.

Unless TK has changed their extractor recently, the bottom of the hook is squared off. That can impede feeding up onto the bolt. You should round over that squared "harpoon tip". Don't get carried away - it should look something like this when you're done:



New mags benefit from cleaning and polishing, but the feed lip rounding reduces reliability in my experience. I traded away 9 mags that had the lip mod done for 3 that had not. It was a good trade IMO.

Don't forget to take your mags apart and clean them regularly. Pay special attention to the inside/front surface where the bullet noses slide up. CCI ammo has a pretty sticky lube that will coat that surface and slow the feeds. I run a little oil on that surface when starting a session with CCI ammo. That reduces the frequency I need to do a complete mag takedown/cleaning.
Reply With Quote
  #6  
Old 12-01-2021, 08:31 PM
RWT22

Join Date: 
Oct 2016
Posts: 
79
TPC Rating: 
0% (0)
I would try the stock magazine springs again. I changed the loading buttons on my magazines to the VQ buttons and that was the trick for me. I was shocked that would be the issue after I polished the heck out of the stock buttons but the VQ were smoother. I think the metal in the Ruger is softer and just causes more friction that the VQ. The TK and Volquartsen springs are quite a bit stronger. I usually pick the worst mag and work on it until I get it working then apply the fixes. I am a believer in those mag buttons.
Reply With Quote
  #7  
Old 12-02-2021, 06:45 PM
Mountainhunter76
US Navy Veteran NRA Member - Click Here To Join!

Join Date: 
Jan 2015
Location: 
Spokane,Wa
Posts: 
16
TPC Rating: 
0% (0)
I am going to purchase some new magazines and leave them be except using VQ follower buttons. I'll try the lubrication suggestions and the extractor suggestion and report back. I hope I can figure something out because I want to love this gun but I am beyond simple frustration now.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off




All times are GMT -5. The time now is 02:57 AM.

Privacy Policy

DMCA Notice

Powered by vBulletin
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
Search Engine Optimisation provided by DragonByte SEO (Lite) - vBulletin Mods & Addons Copyright © 2022 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2022 DragonByte Technologies Ltd.
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2022 DragonByte Technologies Ltd.
Copyright 2000-2018 RimfireCentral.com
x