At a glance:

Product specs match factory spring for ideal fit

Replaces factory rebound spring
Easy, drop-in installation

As an owner of a Ruger® MK series pistol, it’s not uncommon to experience a broken or lost firing pin rebound spring. Stock up on replacement rebound springs and avoid the hassle of a missing or broken part when at the range or working on your gun.

These Ruger® MKII™, MKIII™, MKIV™ and 22/45™ rebound springs match the factory rebound spring specifications for an ideal fit in your Ruger® MK series pistol. These are a drop-in part that require no tools to install. The springs come five in a pack, to ensure you always have extras on hand.

Supported Models:

(Select) Ruger® MKI
(Select) Ruger® MKII™
(Select) Ruger® MKII™ 22/45™
Ruger® MKIII™
Ruger® MKIII™ 22/45™
Ruger® MKIII™ 22/45™ LITE
Ruger® MKIV™ Target
Ruger® MKIV™ Hunter
Ruger® MKIV™ Competition
Ruger® MKIV™ Tactical
Ruger® MKIV™ 22/45 Tactical
Ruger® MKIV™ 22/45 LITE

46 Reviews

5
Replacement for lost parts

Posted by Jimmie Wood on 5th Apr 2021

At some point I lost the spring and the spring support and didn't even know. These springs are like factory original. Wish you supplied the support part as well.
5
Works Great!

Posted by Pat on 30th Jan 2021

Springs work great. They were in stock and reasonably priced. Shipping was efficient.
3
Rebound Springs Didn't Fit

Posted by Todd on 20th Jan 2021

I needed a new rebound spring after 20 years of shooting my Mark 2 22/45 and saw a TandemKross Youtube video. I figured I'd give their springs a try. They showed up and didn't fit. I contacted TandemKross and was told that Ruger has changed the dimensions of the Rebound Spring Support. The springs now have a smaller inner diameter than previously as the support is thinner. I contacted Ruger and they sent me both a spring and the support. I'll hang on to the TandemKross springs as they now fit the support Ruger sent. Not really TandemKross's fault, but it would have been nice for their page to mention the springs don't fit older pistols.
5
Springs

Posted by Jim Corcoran on 11th Jan 2021

Awesome quality, price and delivery.
5
Springs

Posted by Scott Jones on 18th Dec 2020

Nice to have a 5 pack so I don't have to scramble next time I have issues. Price was good, shipping was quick, and I am happy with the product.
5
Good stuff

Posted by Don on 16th Nov 2020

The product shipped quickly and was just what I needed. I highly recommend Tandem Kross and this product.
4
Rebound Springs

Posted by Greg on 27th Aug 2020

These springs are close to original. However they don’t have the tapered end like the factory springs do. They work fine and are the only springs I could find online. I shared some with a friend. Good part to have a few spares on hand!
5
Sofa King Great!

Posted by Rona on 26th Jun 2020

Only used one and it worked perfect! I'll review the others when I get to them.
5
Rebound Springs

Posted by steve shep on 31st Mar 2020

Shipped Fast, just as discribed !