Yes the Magnum was just a Mattoc for big tyres. Same great performance and reliability, same upgrades apply. Check you've got the newer wiper seals (prior to 2018 they had two piece which had a lot more friction) and there's a second compression shim in the damper which you probably don't want if you're not on plus tyres.
For IRT. You might have fine threads on the top of the stanchion (same as 2019+ Mattoc and Mastodon). There are two different IRT models:
www.shockcraft.co.nz
www.shockcraft.co.nz
For IRT. You might have fine threads on the top of the stanchion (same as 2019+ Mattoc and Mastodon). There are two different IRT models:
Mattoc IRT Upgrade Kit Fine Thread 2020+ (Manitou) | Shockcraft
IRT: Infinite Rate Tune for 2020 Mattoc forks with fine thread (M31x0.8mm) <br /><br />Upgrade to add a second individually tunable air chamber to the positive air side of Mattoc forks <br />Direct fit to 2020+ Mattoc Pro, Mastodon Pro, 29+ Mattoc/Magnum
Mattoc/Magnum IRT Upgrade Kit (Manitou) | Shockcraft
<p>Fits all Mattoc Pro/Expert 26" and 27" forks as well as the Magnum 27+ and 29+ forks.<br /><br /><span>Adds a second individually tunable air chamber to the positive air side of Mattoc & Magnum forks. </span>Second positive chamber can be use