Here we go again..... this price thing is a fallacy, people getting confused over SIG putting two prices on their website. Look at the dealer network prices and ignore the factory direct prices. Look at the price of the 4*60 on the SIG web site to see what I mean...

You can get an Irvine 53 for under $120, the OS 50 costs over $150 and its not as powerful....

The OS46FX is a good reliable engine, there are several US 40's at my club all with 46FX's. Mine starts on the first flick.

I've got an Irvine 39 and I've tached it against my 46LA & 46FX. Powerwise its between the two but not far behind the FX. The 53 should power the US like a rocket