u/Plead_thy_fifth

I'm interested in building a 6 ARC in an ICAR platform. I understand that it uses an AR15 trigger and grip but am unclear on other components?

1. Does it use a standard ar15 barrel chambered in 6 ARC? Or is it a specific ICAR frame barrel chambered in 6 ARC?

2. I know an AR15 bolt won't fit, right? I thought the whole reason for the Icar was because bolt lugs on an AR15 are too thin and prone to break. (And magazines with round OAL issues).

3. what about the BCG? Is it ar15 BCG with just a different bolt? Or a whole other carrier group?

4. I have some proof PXT Barrels, I was originally going to build with my JP bolt on a standard frame, but if I'm able to build on an ICAR, what bolts would likely be best for high accuracy like JP? Who makes ICAR components other than PSA?

I have a Proof Research Barrel in 6 ARC that I bought a year ago. But I am torn, do I throw that on an LMT MRP or get a Geissele GFR in 6 ARC of the same length.

The LMT:

- love how the rail is monolithic, no pressure on barrel nuts for barricade or bipod shooting.

- proof research barrel will definitely be more accurate than the 16" GFR

The GFR:

- Refined, delayed, and perfected gas system.

- complete rifle so you know you won't have to mess with anything to get it to work perfectly. It's already done.

-still a very good barrel. Just not AS good.

My intention with it is my "do all" combat rifle. Will be my 0-800m gun, competition, training, SHTF, everything. It will be replacing my 14.5" 5.56 rifle which is currently my 0-600m gun. For reference, I have a 10.5" shorty, and 20" 6.5CM large frame, and many LR Bolt guns, but those are all relatively single purpose; this is replacing my "can only grab one" rifle.