New build..help me spend some tax money?

So the Proof Research barrel I purchased has a 5/8x24 threads on the business end and was wondering if any of you have experimented a little with comps? I did some digging and found some research done on the APA fat bastard, did really well but there’s a new version 2 so I don’t know if it’s just as good or if that’s the one the test was done with.

Check out the Insite arms Heathen Brake as well. There's a couple reviews on here for it. I will have one on my 6.5CM in the next couple weeks as well.
 
Why in the world are you specing this with a long action? You're just asking for feeding issues, stick to short actions for short action rounds.

My advice, buy an AI AX... I know you want to build id yourself, but in the future you can order barrels and change them yourself with a 4mm allen wrench.
 
Check out the Insite arms Heathen Brake as well. There's a couple reviews on here for it. I will have one on my 6.5CM in the next couple weeks as well.
I purchased a brake already I’ll post up a picture here in a few minutes. There was so much positive feedback from others that I searched on that I went with AREA 419’s
 
Why in the world are you specing this with a long action? You're just asking for feeding issues, stick to short actions for short action rounds.

My advice, buy an AI AX... I know you want to build id yourself, but in the future you can order barrels and change them yourself with a 4mm allen wrench.
I’m not if you would have read mine and others replies, you’d see I’ve stuck to a short action.

Thank you for the advice I appreciate it but I’m going to stick to building something you can’t buy off a shelf and I’ll be able to switch barrels AND calibers with the set up I’m going after.
 
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AREA 419 Hellfire Brake aaaaand a Evolution carbon fiber bi-pod..this was supposed to be in an FDE so they are sending me the other but for sakes of the picture I combined the two.
2ev4w2a.jpg
 
Question for you fellas, any recommended AICS magazines you guys recommend that would work flawless with the TL3 and MPA chassis? From what I gather on MPA’s website it’ll only take the AICS magazines.
 
You could change bolt heads, use the same action and have 28 Nosler , 6.5 creed, 223 switch barrel. Might have a hell of a time getting the 223 to feed. LOL.
As I said to his response and as it’s been discussed through the thread, I won’t be going that route as I didn’t know I might run into issues so I’ll be sticking to a short action chassis. Now, which AICS magazines would you guys recommend.