The kit as of 26/03/26 is a full Super Extended Seal Kit for all the following rifles:
S300, S310, S400, S410, S500, S510, Superlite, MPR, TDR models

You will not need all the seals provided in this kit for some models,

and so just use the ones you need

i.e. There are the breech seals for both the old & new .177 models and for .22 calibre. 

(Just use the seals that you require)

Seal kits are for both .177 & .22, Carbine and full-length rifles

1 x S327: Filling Valve O-Ring

1 x RN219/9: Pressure Gauge O-Ring

2 x RN234: Reservoir Cylinder O-Ring

2 x S427: Transfer Port & Pressure Gauge Mount (bottom)

1 x S536: Gauge Mount Bolt Head Side

2 x S474: T-Bar Filling Valve O-Ring

1 x S484: Barrel Support Clamp & Male Connector O-Ring

1 x S615H: FAC Barrel Band O-Ring

1 x S484H: Barrel Band for Shrouded Barrel O-Ring

1 x S536: Pressure Gauge Mount (top)

1 x S538: Barrel .22

1 x S536: Barrel .177

1 x FP121 New 4.5x1.5mm .177

1 x S556: Magazine O-Ring

1 x S650: Loading Bolt Shaft Buffer O-Ring

2 x : Loading Leaver Buffer O-Ring

1 x S465: Pressure Gauge Dowty washer