pistonseal cometa 400

[sr500]

Hi guys. What seal shall i buy, the apex small, or the one thats a little larger? The gun is brand new. I did read, that the cylinder can differ in ID, betwen guns

[OleTomCat]

Depends on how much honing you intend on doing to the cylinder, usually I wait until after I have the gun apart to decide what seal is going it but I have that luxury since I have about a dozen seals on hand at any given time..

Usually if the chamber only has some mild honing I use the Small Apex, if it is really Molested step up to the Tesla, above that go with the Small Apex + 8 thou.