[-Shade]

The M14 cylinder is a different length than normal ones. So if you upgrade that, be sure to get one specifically for an M14. Maybe you're using the wrong grease/oil for the o-ring, lol.

SHS and Rocket (same OEM) are very good and I use them in almost all my builds. They can have fitting issues, so you should always check by putting the piston in an empty shell, screwing it together, then tilting it back and forth to see if it slides freely/easily. If it does, you're golden - if not, then file the rails down/inbetween, little by little, so it can slide without a problem. All that being said though, the lonex red is still the better piston. In terms of the heads, everyone has the lonex POM piston head in stock nowadays I think.

Stay awaaaaaaaay from the guarder nozzle. You want one with an internal o-ring for a better seal. This is KEY. If I recall, the guarder doesn't have one. If I'm wrong and it does, then use it - not sure if they've updated them or not. SHS M14 nozzles are about $5 or less. Don't forget to add a drop or two of silicon oil to that little o-ring either, lol.

And no problem. Glad I can help.