The Guarder motor is very nice. I run one in my Stoner 63.
Another awesome option to look at would be the SHS high torque motors. They're cheap and kick all sorts of ass. Pairing one with standard ratio gears and a 7.4v lipo should put you in the 18-22rps ballpark.
The EG1000 is no longer a relevant motor, they're nice, but they're not neo magnet motors and are not even close to being worth the price.
You shouldn't get much if any pre engagement on that set up, but as already mentioned, the lonex pistons are quite heavy. If you feel so inclined, remove the bearings from the piston head, and swiss cheese the piston. That paired with a 120 spring and you won't have any problems.
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