I'm looking to buy a chassis and I'm new to bolt actions. I just bought a Tikka t3x 6.5 creedmoor 24" . I'll attach a picture from Grabagun where I purchased it. I called them and asked already as to where they responded "we dont know" what!? So now I'm here seeking help. I'm possibly going with a MDT chassis and I need to know if it's a long action or Short action. How would I know what I have ? Side note....I'm still waiting on the rifle delivery.