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This is an excellent and simple mod for the M28. When I was working heavily with my M28, and was trying to decide what to do with the piston, I employed a similar mod, but much less sophisticated; I filled the huge gap in the piston o-ring groove with white teflon tape:

The works great, but the problem is, the teflon tape gets 'gooey' and begins to deteorate from constant use, and will need to be removed & replaced (R&R). meshootyoubang's mod allows for a more permanent and consistant solution. Imagine how much pressure is being lossed through that "Grand Canyon" of an o-ring groove.

Yes, Cheeseman is offering to have made near stock replacement 45 degree pistons, made from 6061 aluminum. I'm down for one, and I hope that everything comes through, so I can test the piston out. A replacement piston is really what this platform is missing to be a nice shooter. Until thien, this o-ring mod is an excellent fix to help boost the fps of the M28 rifle.
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