Aerojet Rocketdyne's AR-1 engine (aka AJ-1E6)

[leovinus]

Aerojet Rocketdyne completes assembly of its first AR1 rocket engine
https://spacenews.com/aerojet-rocketdyne-completes-assembly-of-its-first-ar1-rocket-engine/

Though nice to see progress, article seems to lack mention of price or re-use.

[hkultala]

Do they have any customers for AR-1?

Even though not officially declared, Are they still hoping to make some kind of "Atlas VI" where RD-180 is replaced with two AR-1's ?

[gongora]

Firefly has talked about using it for their larger vehicle.

[russianhalo117]

Firefly has talked about using it for their larger vehicle.

They recently chose to go with in house Reaver-2 and Reaver Vacuum Engines for Beta. It is now only on the table for Gamma.

[TrevorMonty]

LM could build XS1using AR1 and RL10.

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[jstrotha0975]

LM could build XS1using AR1 and RL10.

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XS-1 was canceled by Boeing.

[russianhalo117]

LM could build XS1using AR1 and RL10.

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XS-1 was canceled by Boeing.

And was for fully cryogenic/storable green propellants for stage 1.

[gongora]

[CNBC] Aerojet Rocketdyne completes first AR1 rocket engine, but won’t test fire until at least ‘late 2022’

“Aerojet Rocketdyne could be in a position to hot fire the AR1 engine in late 2022,” the company said in a statement to CNBC on Tuesday.

[TrevorMonty]

LM could build XS1using AR1 and RL10.

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XS-1 was canceled by Boeing.

Doesn't stop LM building their own version.

[Steven Pietrobon]

Doesn't stop LM building their own version.

Yes it does. LM's business model (like all primes) is making money from US government contracts and standard commercial products. Building their own XS-1 without a customer is not going to happen.