Defiance Action Pre-fit / Tenon Compatibility

[Chappies]

Hi Guys, I would like to know, if my 6.5 SAUM chambered barrel, that was spun up and fitted to my Defiance Deviant Long Action originally, will fit on my Defiance Ruckus XM (old medium) Action?

In other words, are the tenons the same between those two, and if screwed on, would the headspace be the same or similar with the bolt close between the medium and the long action?

Is my understanding of the two actions correct that the length difference only really needs to be applicable when the bolt is cycled all the way back, to cycle longer cartridges, but as the chambers are in the barrels, technically when the bolt it closed they should / could be the same length from the shoulder of the chamber?

I am wasting a lot of space with the 6.5 SAUM on the Long Action, and it would be perfect for the Medium Action, which will then free up my Long Action to build a more suitable true long action cartridge rifle with it. This would help me not to have to maybe get 2 whole new barrels, or lose 1-2 inches of length on the 6.5 SAUM barrel to have it re-chambered with a new tenon cut in.

P.S. Yes I know Defiance does not send out tenon print or publish them, and I know they historically had a strong stance against it, but that we before their new guaranteed headspace actions, and with all the pre-fits on the market nowadays, I hoped this can be discussed again without backlash.

According to this page of the Kelbly Atlas, their tenon is the same between the long and the short action: Atlas

 

[Kiba]

Unfortunately, the deviant is not off the shelf prefit capable as the receiver face to bolt face dimension was not controlled to +/- 0.001 on the deviant actions. Only their newer actions are prefit capable... See below.

While you can have a prefit made for your deviant, the gunsmith would have to have already measured your action, and the barrel would be correct on only that particular deviant.

While it's only a small sample size I've measured 3 deviants over the years while swapping barrels, and none of them would be interchangeable.

There may be a slim chance you could move your barrels around between actions, but you would have to pull the barrels on both actions and take measurements with a depth mic... But with the spread I measured between those 3 deviants I'm going to say the chance of things headspacing correctly is slim.