by FuzzyGrub » Sun Mar 15, 2015 7:06 am
The body of all Gen II valves changed to accommodate the new trigger pack screw location. The Gen II valve bodies have been slotted such that they can be used in Gen I and Gen II guns. Gen I valves would need the screw relief drilled to fit Gen II, as mentioned above.
On 25 cal Gen II valves, the return spring is stronger than Gen I. This will lower the over all peak power compared to Gen I 25 cal gun. The advantage of the stiffer spring, is a lower Es with a typical 16 shot string w/3K fill. I prefer the lower Es, but you can just swap in a 177/22 valve spring, if you wanted the higher peak power.
I would have to check all schematics to be 100%, but believe the poppet is the same in both Gens and all calibers. Also in Prod, 1720T, 1701P, valves.
John
Prods: 2201P .22 Pistol, 1720T Camp Carbine, M4 .177/.22 Carbine, PMrod .177/.22 Rifle, MProd .22
Mrods: .25 MDRL Bullpup, Srod .25 Syn Stock, Gen II Woody Reg'ed 177