Has anyone thrown on any ambi bolt catches/release, or mag releases and can make some recommendations?

IIRC (and I do), I tried to throw a Geissele Maritime on my predatOBR 7.62 and it was not compatible.  I haven't revisited it since then.  I have some spare FCD with forward bias, so maybe I'll have a look.

I have the FCD EMR-A mag release (dimpled) and the FCD ASF-90Q ambi safety on mine. Love it.

Can you expand on the selection you made for the mag release? You have a 7.62 OBR correct? It’s asking for different length options and they also list it as an AR15 release and that 308s differ to much🤨

I love Roger and FCD, but I have stuck with the Norgon ambi mag catch and think even though its surface area is smaller, you can effectively operate the control with a left thumb push.

Not sure if you are right handed, but the amount of times I have had to use an ambi mag catch is small.

@ChickenMan11 My 7.62 PredatOBR is a 2015 vintage 18". I have the EMR-AA, standard length,. This is what my lower looks like with it installed:

That picture makes it look close to the bottom of the stock bolt release, but it clears easily...

That’s nice. I’m going to have to check it out. It’s kinda funny, but I bought an ambi bolt catch from larue (I think) when I ordered my OBR and I haven’t had a chance to put it on or even look at it to get an idea on how I’m going to do it. If memory serves me correctly from when I was in the military, the bolt catch uses a roll pin to hold the latch in. Now after looking at your OBR picture closely, the receiver is clearly different. How are you supposed to punch the pin out and tap it back in with that slot off to the left side of the thumb release? I would think it would limit your access to the pin. I’m sure it was done by design to make it more difficult for just anyone to do work on them.

Looking at that machined recess to the left of the catch, I think it's big enough to drive the pin all the way through the bolt catch and out the other side, and it would fall out. Then you just put it back in from the right again. You'll need a full length 1/16 punch, though.