Blast Pack for Ruger® Mark IV™ and 22/45™
Blast Pack for Ruger® Mark IV™ and 22/45™

Blast Pack for Ruger® Mark IV™ and 22/45™

Part Number:TK24N0444SSL1
Average Rating
Your Price: $79.99
Out of Stock

The “Blast Pack” for Ruger® Mark IV™ and 22/45™ is a match set ONLY - DO NOT use any other brand of sear and hammer with the TANDEMKROSS “Blast Pack” for Ruger® Mark IV™ and 22/45™

At a glance:
  • Radiused sear and hammer interface for clean, crisp, and repeatable trigger pull. 
  • Approximately 2–2.5lb trigger pull (results may vary)
  • Neutrally balanced, drop-safe sear
  • Highly impact and wear resistant, heat treated, S7 hardened tool steel for long-lasting, optimal performance
The TANDEMKROSS “Blast Pack” is a serious upgrade for all Ruger® Mark IV™ and 22/45™ owners! 

Our innovative redesign of the fire control system safely reduces trigger pull weight for a performance boost and increased reliability! The lubricant coating on the hammer and sear provide a consistently smooth hammer-sear interface right out of the box. Our lightweight hammer also moves at a higher velocity leading to reduced lock time.

The “Blast Shield” Magazine Disconnect promotes proper magazine alignment for consistent and reliable feeding. It also protects the hammer and sear from debris and build up for easy maintenance.

Perfect for competition shooters, small game hunters, or any rimfire enthusiasts, the [TK] “Blast Pack” for Ruger® Mark IV™ and 22/45™ will bring your .22LR plinking to the next level!

This Kit Contains:

“Thunder” Hammer and “Lightning” Sear
  • Safely and reliably reduces trigger pull weight
  • Provides consistently clean and crisp trigger pull
  • American-made and guaranteed for life
  • Allows for safe removal of the magazine disconnect
  • Facilitates proper magazine alignment
  • Shields sear and hammer from debris
BLAST past the competition with the BEST fire control system on the market; the TANDEMKROSS “Blast Pack” for Ruger® Mark IV™ and 22/45™!

Support Models:
  • Ruger® MKIV™ Standard
  • Ruger® MKIV™ Hunter
  • Ruger® MKIV™ Target
  • Ruger® MKIV™ Competition
  • Ruger® MKIV™ 22/45™
  • Ruger® MKIV™ 22/45™ LITE
  • Ruger® MKIV™ Tactical
  • Ruger® MKIV™22/45™ Tactical 
Looking for the "Ultimate" fire control upgrade? Include the TANDEMKROSS "Victory" for unmatched performance! Find the full package in the "Ultimate" Trigger Kit for Ruger® MKIV™ or MKIV™ 22/45™

Don't forget, all TANDEMKROSS products are Made in the USA and come with a LIFETIME guarantee!

WARNING: This product can expose you to chemicals including chromium, which is known to the State of California to cause cancer. For more information go to
5 Stars
Awesome upgrade!
This upgrade takes the Ruger Mark IV to an entirely new level! Note, I already had the victory trigger so adding this resulted in the ultimate trigger upgrade kit. Stock Ruger trigger assemblies are adequate for plinking, beginners, or basic home defense, but not much beyond that. Changing out the sear, hammer, magazine disconnect, and trigger seriously dropped my trigger pull to what feels like sub 2 lbs! Far better than expected, to be honest. And with the pre and post travel adjusted, hand and wrist movement between shots is minimized, further increasing accuracy. Just amazing. The blast shield magazine disconnect alone makes a huge difference; you can feel how much easier it is to insert, seat, and remove the mags. With the upper receiver removed, you can see how the internals seem to line-up better with the feed ramp, and I've heard this improves the occasional FTF situation. Sure, you lose the magazine disconnect safety feature - which some will feel is actually a benefit and not a liability - but for me the improved performance is worth the trade-off of a little extra caution between mags and during handling or cleaning. Installation: if you're new to disassembling the lower as I was, watch the various installation videos available out there, read the instructions a few times, and then have fun getting to know your firearm while installing this game-changing upgrade. Finishing this is a confidence builder! I had some questions and the team at TK knocked it out of the park in terms of customer service and response. Honestly, what more can you ask for?! Definitely worth the money because again, it took my Mark IV to an entirely new level! Thanks TK for another awesome product!
Did you find this helpful?  25 of 26 Found Helpful
Reviewed by: (Verified Buyer)  from Phoenix. on 6/4/2021
5 Stars
It works
I installed this kit and measured my trigger pull after installation using a Wheeler 309888 Trigger Pull Scale. When I measure at the absolute lowest point on the trigger I get a 2# pull. Half way up the trigger I get 2.5#. I’d say this kit does work as advertised and am very satisfied.
Did you find this helpful?  18 of 19 Found Helpful
Reviewed by:  from South Florida. on 5/24/2021
5 Stars
Blast Pack
Purchased Blast Pack for my Ruger MKIV 22/45 Lite. I had already installed the Victory Trigger but still wanted a better trigger. Watched the video, fairly easy and straight forward installation. Trigger pull improved, down to 2# as per my Lyman digital tigger pull gauge. Beside the improved trigger pull it removed the mag disconnect which I really disliked. Over all great purchase and very satisfied.
Did you find this helpful?  15 of 15 Found Helpful
Reviewed by:  from Spring Branch. on 6/27/2021
5 Stars
"Blast Pack" for Ruger MK IV
I purchased this kit for my Ruger MK IV 70th Anniversary model as I wanted to improve the trigger pull but did not want to change the look of the pistol with an aftermarket trigger. The installation instructions were great and the result even better. Excellent quality at a very good price.
Did you find this helpful?  15 of 17 Found Helpful
Reviewed by:  from Alaska. on 5/23/2021
5 Stars
Trigger System
I already had the Victory Trigger on my Mark IV and decided the use this kit to further upgrade the trigger. I have other Mark IV pistols but I used Apex parts in those. The Tandemkross kit was fairly easy to install. In conjunction with the Victory Trigger, the kit produced a dramatically lighter trigger pull. I still like the Apex kit but this kit definitely produces a lighter pull. I am very pleased with it.
Did you find this helpful?  13 of 13 Found Helpful
Reviewed by:  from TX. on 6/14/2021

Recently Viewed Items

Browse By Category