Yes they are.
I have owned three 54s and now own a 56 (same as 54 but thumbhole) and a 48. I have just finished tuning and powering both down. They are super accurate and fun to shoot, especially since they have been tamed considerably.
I anticipated posting reviews on these rifles in the coming week.
BTW - my 56 is .22 and my 48 is .177.
DZ