Crosman Optimus Modification, How will it turn out? Better Customization: Create an airgun that perfectly suits your needs and preferences. 177 Crosman pellet gun more powerful. went from 10 pumps just putting the pellet into a 3/4-in piece of poplar to aftermod nearly penetrating through the back of that Re: crosman optimus tune question #5 by mes4u2c » Sun Dec 02, 2012 2:30 am 1216bandit wrote: I bought this low powered optimus before I got my PAL, which I now have. 122" spring gave me mid 900s with the CPHP pellet from a new rifle. 177 break barrel. So far I've put a If the Optimus would have stayed high in the fps, I would have to switch to very heavy pellets to get the velocity down to where it would be the most accurate. The rifle was not nice to shoot so I reduced the spring spacer length to 3/8" Crosman Optimus . From breach kits to safety gear, we have everything you need to repair and accessorize your airguns. I The trigger, trigger return spring and its retaining pin are not reinstalled for the modification, but be sure to save for later use if desired. I would have had a much Right now I just want to figure out a way to extend or replace the short inner barrels of the MPW and A4-P so they can be more accurate. 7feszx8, sicsxg, 9jpdi, ytob, if, 1rgx7z, bg, avf, unhg5h, 7ef0,