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Imperial Guard · September 3rd, 2006, 05:08

I'm a proud owner of a TM G36, but my gun has a problem that keeps me awake at night:
I got a PDI170% in the gun last year and only test fired it. It was shooting at around 430fps with hopup off.
For this summer, I tested it extensively and the fps varied from mid 380's to mid 430's, averaged to be roughly 390-400fps with hopup off.
It started a couple of weeks ago, just before I considered de-tuning the gun for safety and reliability reasons, the fps suddenly dropped from 390-400fps (at noon) to just 335-365fps (in the evening) before I got a chance to touch the gearbox.

Then I tried a new Prometheus MS120 and the gun chronoed at around 380-390fps, but the same spring could hit up to 420-430fps on my buddy's AK.
Thus, I'm suspecting a leak/mechanical problem somewhere. But upon careful inspection of the whole gun, I just couldn't find anything wrong with it. And I'm very sure that all the parts are installed and lubed properly. For reference, here's my G36's setup and my buddy's AK's setup:

TM G36 (only non-stock parts listed)
Star 6.05mm/495mm inner barrel
Systema Area 1000 piston and aluminum piston head
Systema V3 bearing spring guide
Prometheus MS120sp (used to be PDI 170%), will switch to MS100sp.
10.8v batt
Systema metal bushings and shims.

TM AK47
Hurricane FTK M120s

I guess my main concern is: would the combination of aftermarket cylinder, cylinder head, and loading nozzle make such a difference (50fps increase)?
If it could, then I have nothing much to worry about; if it couldn't, that means something is f'ed in my gun. Any feedback?

September 3rd, 2006, 05:08	#1
Imperial Guard Trader rating Join Date: Jun 2003 Location: Fort McMurray	TM G36 power loss problem I'm a proud owner of a TM G36, but my gun has a problem that keeps me awake at night: I got a PDI170% in the gun last year and only test fired it. It was shooting at around 430fps with hopup off. For this summer, I tested it extensively and the fps varied from mid 380's to mid 430's, averaged to be roughly 390-400fps with hopup off. It started a couple of weeks ago, just before I considered de-tuning the gun for safety and reliability reasons, the fps suddenly dropped from 390-400fps (at noon) to just 335-365fps (in the evening) before I got a chance to touch the gearbox. Then I tried a new Prometheus MS120 and the gun chronoed at around 380-390fps, but the same spring could hit up to 420-430fps on my buddy's AK. Thus, I'm suspecting a leak/mechanical problem somewhere. But upon careful inspection of the whole gun, I just couldn't find anything wrong with it. And I'm very sure that all the parts are installed and lubed properly. For reference, here's my G36's setup and my buddy's AK's setup: TM G36 (only non-stock parts listed) Star 6.05mm/495mm inner barrel Systema Area 1000 piston and aluminum piston head Systema V3 bearing spring guide Prometheus MS120sp (used to be PDI 170%), will switch to MS100sp. 10.8v batt Systema metal bushings and shims. TM AK47 Hurricane FTK M120s I guess my main concern is: would the combination of aftermarket cylinder, cylinder head, and loading nozzle make such a difference (50fps increase)? If it could, then I have nothing much to worry about; if it couldn't, that means something is f'ed in my gun. Any feedback? __________________ "Assumption is the mother of all fuck-up's."