The B40 is a very good rifle ,they did have alot of side to side play in the cocking leaver but this is not difficult to rectify. I know that the TX piston and trigger unit will fit, i think it was to close a copy of the TX and this is why its no longer for sale in the UK.The B41 is no way as good , the finish is not as good its very rough to cock. The 41 is fitted with the same trigger unit as the later XS20 model this is not the HW copy as fitted to the early XS20s, but a new unit that is one of the worst triggers fitted to any air gun or even a toy cap gun.
.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.