TM Glock 18C cycling issue

Upgraded hammer spring should be in there; you're light-striking the mag. Use the stock recoil spring for now as that will only change the return stroke and won't affect resetting the hammer (if anything will detrimental to the hammer reset).

 
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Stock recoil spring helps massively. Full auto is a bit sluggish so I may try a 130 spring but stock has greatly improved the performance compared to the 150%

Cheers for the help thus far all

 
This will be down to four things then:

  • Slide too heavy (highly unlikely as AS do mostly know what they're doing)
  • Slide sticking on rails, frame, top of hammer or a combination of all three (likely - keep breaking in on stock spring and manually cycle when bored - more polishing, check that slide isn't rubbing against top of frame too much)
  • Gas not powerful enough (ensure you're filling your mags upside down, that the gas can you're using isn't running out and is sufficiently powerful - perhaps try Guarder Power Up as you have a re-enforced frame now)
  • Gas not getting where it needs to (look at gasket/router shims from Lees Precision Engineering and/or some nineball gas routers)
 
I think the piston head may be knackered too. Will a G17 one fit? Can’t seem to find ones specifically for the 18c

 
Are you useing the same mag or do you have a couple of mags are they/it a a tm mag (hate tm pistol mags personal pref i know but hate them anyway) could the person who had it bef9re you have tryed to set it up for short stroking at some point?

 
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