HW80 LGV Piston Hybrid, news for .22 conversions (AGT80)
When I converted the .177 80 to LGV piston I also completed a .22 conversion at the same time, till now its been somewhat hold sensitive, to the point I thought the barrel was faulty…tried 3 barrels and all had the same issue…so looked deeper.
The .177 conversion is much quicker than the .22, if you keep the 79mm stoke the conversion gives with the .22 conversion you may have to lose 2 full coils off the LGV spring, its nice to shoot but you may find like I did the hold you are used to is just not good for accuracy. A little frustrated by the gun I decided to shorten the stroke in the hope that less air more spring would get the gun to behave a little better…so I decided to just jump right in and go down 10mm stroke, which is a lot!
I in fact went down 11mm to 68mm stroke, in the thinking I could shorten the rod 1mm at a time if more stroke was needed…as it stands there is no need, the AGT80 conversion is so efficient it will make 11.5FPE in .22 from 33CC…I kid you not Best pellets for power look to be 14.5gr Superdomes, Hobby lands at 11 to 11.2, AA fields 10.8, 19.2gr Baracuda Hunter Extremes give 11.3 , I will be trying more pellets over the week. Not shot Superdomes from this barrel before so praying they are accurate.
With this 11mm drop in stroke you still need to lose 1 full coil off the LGV spring. I went 2 full coils and added 8mm of preload so going 1 full coil off should be just about right. You could always go 1 coil off and 1 crushed coil and tune up with preload washers, however remember the piston is already heavy, use synthetic washers to pack up preload and consider adding them on to the rear guide not in the piston BUT remember they have to have an OD that will fit into the piston
The drop in stroke is not needed for the .177 conversion, although those wanting to quicken up the conversion even more way consider losing 3mm to 5mm off the stroke on the .177 conversion.
Will update once the gun has settled down.