Beeman doesn't have any spacers for that breech seal, at least not any I've seen. If you suspect a leak, you'll have to make your own and try it. Like I said, the increase in velocity, and improved smoothness of the shot cycle quicky told me I needed a spacer. A circle (donut) cut out of a business card and placed under the existing breech seal will suffice to TEST for that, but if that proves useful (like mine did here), I suggest you cut a permanent one out of metal, plastic, nylon, another breech seal, etc.
There is no piston seal made to fit perfectly flush with the boss on that piston using only factory parts---you'd run into spacing and other problems if you tried to use one. Either change to a custom seal as previously suggested for a LITTLE gain, or buy the complete Mac1 HW 97 high volume kit (if Tim still has them available), for the very maximum use of the air in the cylinder and less metal-to-metal friction. If you need more info about the benefits of the Mac1 kit, Tim is the man to call.
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