Ridgeline Defense RD-15 LPR

Ordered one, I'm going to slap one of the new Geissele 18" SPR Cut Rifled Barrels in her, or a 16" Kreiger SDM barrel that I've had forever that needs a good home.

I've already got all the other parts in stock that RLD currently use in thier complete rifles to finish it off.

If my Handloads go well in my current ARC rifles, I'll have Paul spin up a 20" Bartlein 6 ARC or 22 ARC.
 
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What AGB should fit under rd15 handguard. ?
I watched the 4 part series the Rudy did on YouTube, the RD-15 currently has a .875 Gas Block Journal with a pretty beefy Gas Blcok so it's a safe bet you can run just about anything you want under .963

Both of my prospect barrels that I'll be using have a .750 Gas Block Journal so it wont be an issue. I do have a couple new 20" and 22" Bartlein's .875 Match Heavy barrels that i keep on hand so i don't have to wait 6 months for a replacement if one or my mine go south. I'll seat both to verify the .875 clears without issue.
 
I see a lot of people with cantilevered mounts in these rifles. It looks like you’d almost never need them since the upper receiver has a few extra pic rails. Has anyone actually found that they needed a cantilevered mount?

Also, when swapping out for an ambi lower…what has everyone been using? It only seems to go onto one of the 4 I’ve tried putting it on…I had heard it’s a tight fit but am still surprised how tight it actually is.
 
I see a lot of people with cantilevered mounts in these rifles. It looks like you’d almost never need them since the upper receiver has a few extra pic rails. Has anyone actually found that they needed a cantilevered mount?

Also, when swapping out for an ambi lower…what has everyone been using? It only seems to go onto one of the 4 I’ve tried putting it on…I had heard it’s a tight fit but am still surprised how tight it actually is.
Mine didn’t fit on any of lowers until I put it on an older spikes lower I have that’s like 20 years old. I was told they are made that way so you can “fit” them to your lower.
 
I see a lot of people with cantilevered mounts in these rifles. It looks like you’d almost never need them since the upper receiver has a few extra pic rails. Has anyone actually found that they needed a cantilevered mount?

Also, when swapping out for an ambi lower…what has everyone been using? It only seems to go onto one of the 4 I’ve tried putting it on…I had heard it’s a tight fit but am still surprised how tight it actually is.
I am using a non cantilever C1 Max badger mount.

With a Mk5 it puts my eye relief in the same spot as a c1 cantilever on a standard receiver.