The 95 and 120AX, on paper, appear to be close in size. Advertised weight difference, without muffler, is about 3 ounces. If you can see both of them at a hobby shop it would definitely help. I have a feeling the 120 is a lot bigger when they are side by side.

I've never seen any AX other than the 46 outside the hobby shop, and it has been a while. It is at the top of the recommended range for the model and I think that's where you want to be with a plane like a P-51. Even if you do a lot of part throttle flying, you want to be able to kick it in the tail and do a really high speed strafing run once in a while.

The 95 and 120AX both cost 280 with muffler. You can get the 120 without muffler for 240. If you have to buy an aftermarket muffler for either, the cost goes up. The Saito 100 costs 330 and you should be able to use the stock muffler. If there's any way you can swing the four stroke, it might be worth it for the easier muffler fit.

Carrell