There is a number of reasons why the sliding breech is the best, one is that when you lengthen the transfer port this will lower the power. Also there is very little wear to the barrel seal as it pushes onto the barrel and not rubbed over it. The BSA rotating breech wears the O ring around it so you loose compression and the O ring that seals the barrel , a number of other designs also suffer from leaks. the slot in the bottom of the action for the pellet to fall though was a copy off the Venom Mach 2 rifle.
.22 Venom Mach 1 (FAC) 6-25x56 Millett.
.22 Venom Mach 2 Thumbhole 6.5-20x40 Leupold EFR.
.22 Venom Mach 2 Sporter 4-12x40 Leupold.
.177 Venom Vantage 4-16x50.
.177 Venom Daystate 8-32x56 AGS.
.22 Venom Datstate 4-16x56 AGS.
.22 Webley Venom FX2000 6-18x40 Busnel Legend.
.177 Titan MPT by Steve Pope 6-24x40 Tasco.
.177 Pro-Sport 4-16x50.
.22 Webley FX2000 3-9x33 Leupold EFR.
.177 Logan Solo 4-16x50.
.22 HW90 (spring powered) 4-16x50
.22 Gamo Stutzen.
.177 Walther lever action.