Yes you can, I have one without an lpr.
www.paintballwholesalers.com has an impulse for 425 with a tapeworm and either a planet eclipse (classic blade trigger style) magnetic blade trigger or a new designz (blade trigger with a small hump in the middle like a double trigger with no nub on the bottom) mag trigger for free. You can see the tapeworm there. If you didn't know what it did, it makes it so you can dry fire it and supposedly cures first shot dropoff, but it didn't do that for me.