Quote:
Originally Posted by Basic-Wedge
Yes, velocity is under control, and the overhop has also been tamed.
The issue of the velocity being too high was easily resolved once I realized my G39 was one of the "Canada only" models, meaning it had been modified at the factory to shoot over 470 fps, in order to meet Canadian importation standards.
I tamed the velocity by fully closing the NPAS valve and by dropping in a small rubber O-ring between the valve and the two prongs on the back half of the bolt (looking at a disassembled bolt, that'll make clearer sense).
It's easy to know what size of O-ring to use - it's the same size as WE uses in the BB loaders they ship with their guns.
My G39 now fires .28s at about 280 fps, comfortably under local field limits. Since the rifle has all the range I need, and good accuracy. I'm leaving it set where it currently is. If I feel need for more velocity, I'll simply open the NPAS valve half a turn.
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Hi, im new to this thread and new to g39. U're able to "tamed" the fps of your g39, BUT im trying to increase my g39 fps.
You said something about putting o-ring behind the 2 prongs on the back half to decrease ur fps. Could you please measure up your 2 prongs for me. The original size is 3mm high. I'm trying to figure out how many mm to cut the prong to increase my fps. and another request, could u please measure how far is the distance from the o-ring to the base of the prong?
(courtesy to some1 called badgi, thanks for the pic, he cut the prong 2mm and with original length from the o-ring to the base of the prong)
Thank you very much for your time.