Willyg1981
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Hello everyone ,
I’m working on my stoner mk63 after initially getting it running very well 380fps ( french field limits) ....
it’s now developed a problem ,..huge loss of FPS ,..I discovered the new double o ring piston head had somehow tipped and caused it to scratch unported brass cylinder ,...
fast forward to now ,.. new stainless unported cylinder , new double o ring piston head , new double o ring Air nozzle and new spring m135 ,
it’s still no better 🤦♂️
I must of taken it apart 10-15 times now , it’s becoming a real pain in the ass.
I’m using guarder teflon grease on piston head and abbey silicon oil on o rings
abbey black grease on grease ( using a small painting brush to apply the grease) to these parts so not overkill at all )
Any ideas ?????
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The stock version is 19.40 and the new one is 19.50 , Surely that is close enough and the fact it’s a tiny bit longer would give a better air seal into the bucking 🤔
the hop is the same as it’s always been,.. the only thing Iv done around that area is change the bucking and r hop the barrel ,
I had it at 400 FPS the very first shot And then levelled off around 370-380 and it worked amazingly well for around a day lol
then I noticed the change in range and this is when I discovered the damaged cylinder
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