Anyone do a spring replacement using the spring kit that Magnum Research officers? Any difficult moments? I bought it used, so not sure of its round count. Shoots ok right now. Thinking new springs would freshen it up a little.

If it ain't broke, don't fix it.

New springs would be stiffer, potentially making the pistol more ammunition sensitive for it to cycle properly.

The polymer extractor 'spring' upgrade fixes a lot of extraction issues my Mark VII had before I sold it off. The guide for springs are pretty easy to replace. Just some c-clips if I recall.

Pathetic when you end up quoting your own response. However:

New springs are generally stiffer and may make your DE more ammo sensitive, more prone to not fully recycle or go into battery, etc.

That's explains my original advice.

Magnum Research told me that my 1991 Mark 7 44 mag DE would probably need a spring tune up kit based on my malfunctions.
I had the firing pin retainer block pop off sending the firing pin and spring rocketing into me.
Surprisingly I found it all.
Also had the extractor fall out around the same time.
They said worn recoil springs will cause these issues.
For $50 it's worth it. I plan on doing in soon.

Magnum Research recommends changing the springs out every 1k rounds or every 2-3 years.

However, the hardest part would be the recoil guide spring. Be sure to wear safety glasses when doing this. Every other spring is easy to replace as they are not in any tension or under complex parts. You might have trouble putting on the cone shape polymer on the extractor. The magazine spring is probably not needed but I guess Magnum Research assumes you only have a single magazine.

I hate digging up old threads but for the op, I just upgraded the springs on my 1990 Mark VII.  First time in all these years.   Make sure that when you install the new springs, place the multi-coil end (it has 3 coils there) towards the gas piston end.   Other wise (like did) you introduce many fail to go into battery conditions because the spring won't seat correctly.

Mine now runs like it did in 1990 !

I should check again for the year of mfg on my DEMkVII.
New springs might be in order, not that it's ever been shot a LOT.
I did have Trijicons and HOGUE installed right away when I got it.

Dang.  Now I have the itch to get this gun out and shoot it again!  
Thanking my BEST FREIND for this gun...he totallly surprised me with it.  

Saw this picture on the internet.  Sent it to my friend.  We'd worked out a trade a couple of years earlier.  We meet at the gunshop.  Gunshop Guy pulls out this.  
I say, "HEY!  It looks just like the picture I sent you!"  
My freind says, "IT IS.  IT'S YOURS."  
I repeat myself...twice.  
Everybody looks at me and then the lightbulb went off!!!  
"OH!  OH, SHIT!  NO SHIT?!"  
I love telling that story!  Got him back with a RUGER SP-101 and a GunVault a couple of years later...'nother story!~



Here she is with her equally unique RUGER SuperRedhawk .44 Sister.  Special blackened stainless steel finish, etc.






Gun threads need gunporn!