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Old 5th April 2015, 02:48 PM
Skypilot Skypilot is offline
Join Date: Sep 2012
Location: US
Posts: 17
Default LGU FAC to 16J issue

Good Morning from the left side of the pond.

I just took delivery of an FAC LGU. Nice gun.

I bought a 16J Kit from Germany. When installed, it's shooting 7.9's at 725 fps with the FAC delrin Tophat and an additiional .1" delrin piston spacer. FAC velocity was 900 fps prior to the spring guide changeout.

The 16J spring is a 33 coil .130 wire, same as the FAC, but the coil pitch is reduced. The piston stroke and mass for both pistons ( FAC & 16J) are the same.

I think the issue is that the 16J guide is way too tight. ( I can hear it gripping and honking while cocking.) Before I chuck it up on the lather & turn it down I thought I'd ask here if anyone had any other thoughts.


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