Basically the same rifle with different furniture. Triggers are not adjustable like the earlier models but its not much of an issue to worry over. Caliber,...it depends on what you prefer. Pumps are available, and from what PA told me, they'll soon have the pressure gauges in stock as well. Both the RX2 and the HW90 are leaps and bounds ahead of any crosman or gamo 'gas -struted' rifle in power and performance. Get one, you'll never regret it!!! tjk