FWB 3OOs

[magnummike]

Hi chaps I have just noticed that the cone seal is starting to disintergrate its not had much use in its life , do these seals degrade with time its the clear white type and will the buffer inside will be in the same state . I also have a 3OOsu with a green cone seal that seem's to be fine are these seal's better than the clearish whte one ATB Mike

[elewis411]

Hi chaps I have just noticed that the cone seal is starting to disintergrate its not had much use in its life , do these seals degrade with time its the clear white type and will the buffer inside will be in the same state . I also have a 3OOsu with a green cone seal that seem's to be fine are these seal's better than the clearish whte one ATB Mike

Yep, every original white one i have seen has been falling apart, they naturally degrade over time and the buffer could possibly be in the same sort of state. The newer type replacement breech seals are either blue or green and are probably made out of a better type of material, i think but may be wrong, but if the rifle is up to the mark velocity wise [usually around the 570-620 fps range] then the piston buffer should still be ok , like i say though, i may be wrong on that last bit...

[nige346]

If the rifle is fitted with the original breach seal it is very likely the other is also original, these deteriorate due to the original material breaking down & not through use itself, I would definitely change both as very unlikely the piston buffer would have been changed without the breach seal being that the later is far easier to fit, newer Polyurethane seals will last a very long time so a worthwhile exercise, john knibbs sells seals in modern material albeit in orange (just to be different),
Good luck with it

[Peter Dunkley]

Yep, every original white one i have seen has been falling apart, they naturally degrade over time and the buffer could possibly be in the same sort of state. The newer type replacement breech seals are either blue or green and are probably made out of a better type of material, i think but may be wrong, but if the rifle is up to the mark velocity wise [usually around the 570-620 fps range] then the piston buffer should still be ok , like i say though, i may be wrong on that last bit...

Afraid you are wrong mate. The piston buffer is there only to stop the piston slamming. The seal comes from a piston ring like a car.
Best to get them both done as when the buffer does break up it can jam the piston and you are then in a bit of trouble.
I cant post piccys but I am sending you a picture of the piston buffer breaking up.

[elewis411]

Afraid you are wrong mate. The piston buffer is there only to stop the piston slamming. The seal comes from a piston ring like a car.
Best to get them both done as when the buffer does break up it can jam the piston and you are then in a bit of trouble.
I cant post piccys but I am sending you a picture of the piston buffer breaking up.

Hell of a mess, is there an hole through the piston under the buffer, i think i saw a picture of a 300s piston without the buffer fitted and it had an hole straight through under where the buffer goes...

[Peter Dunkley]

Hell of a mess, is there an hole through the piston under the buffer, i think i saw a picture of a 300s piston without the buffer fitted and it had an hole straight through under where the buffer goes...

No. if I remember correctly the buffer has a plug on the back of it which fits into a recess, but no hole all the way through.

[nige346]

I'm with this, the piston seals are steel rings like an engine piston, never seen one wear out yet, the buffer breaking will cause the piston face to slam into the transfer port face which will do irreparable or at least very expensive damage if you continue to use long term, do em both and you'll have a great rifle.

Afraid you are wrong mate. The piston buffer is there only to stop the piston slamming. The seal comes from a piston ring like a car.
Best to get them both done as when the buffer does break up it can jam the piston and you are then in a bit of trouble.
I cant post piccys but I am sending you a picture of the piston buffer breaking up.