I see the breech seal as a weakness in the fixed barrel airguns.
Wishing to seperate the functions of compression tube stop/buffer and barrel/breech seal. Thinking that a more consistant and reliable lockup that maximizes the accuracy of the gun would result.
This B40 is driving me nuts! There must be a better gun hiding inside there somewhere somehow!
BTW did your 430 have the seal Hector designed?