Cosmitz Posted July 31, 2010 Report Share Posted July 31, 2010 Long story short, i made a VSR from scratch with these parts: Boreup Premier Palsonite Cylinder SET VC / VSR-10 VSR-10 Boreup Receiver Taper Front Barre L - Bull Barrel Base SPR 300 % VSR Long 554mm barrel, 6.04mm VSR-10 Pro-Sniper Muzzle Cap Boreup New Trigger+Piston-end/ VSR-10 Tokyo Marui New Precision Chamber Set for VSR-10 Firefly Hard bucking for VSR10 PSS10 Bolt Handle for Marui VSR-10 Sniper The setup was ment to shoot about 550 fps, about 165-170m/s. After a number of test fires, the bolt/cylinder started getting locked in the back. Took it all out and saw the piston end, the one that the sear catches.. was bent as a whole on the axis with the body.. took it out, took out the metal shavings, used epoxy, screwed it back.. it was good for another number of shots, until disaster struck again. http://dl.dropbox.com/u/4037018/sniper/Image1470.jpg So... did the PDI piston just gave up at just a 160m/s? I mean, i think the cap itself is good, just that the piston itself bended and failed on the inside. I contacted both X-Fire.org where i got them from and also Polarstarairsoft.com. In the meantime.. can anyone enlighten me on what caused this? Is this a regular occurence or did i just screwed up something badly? Too soft trigger and too little sear? Link to post Share on other sites
l96ninja Posted August 1, 2010 Report Share Posted August 1, 2010 It may have been because you bought a VC piston, these were made for a lighter FPS, and 550 is like the MAXIMUM (notice the caps!). I would try a HD piston and see if that cures the problem. Link to post Share on other sites
Cosmitz Posted August 1, 2010 Author Report Share Posted August 1, 2010 So the body of the VC vs the body of the HD piston is different in terms of material and durability? Because other then that... nothing would have changed. Link to post Share on other sites
l96ninja Posted August 1, 2010 Report Share Posted August 1, 2010 Yeah, the HD piston is designed to be stronger than the VC. The VC piston is designed to rid a gun of the vacuum effect caused by longer barrels, but since you got the Bore-Up cylinder, that wouldn't be a problem. Link to post Share on other sites
Cosmitz Posted August 1, 2010 Author Report Share Posted August 1, 2010 Yeah, the HD piston is designed to be stronger than the VC. The VC piston is designed to rid a gun of the vacuum effect caused by longer barrels, but since you got the Bore-Up cylinder, that wouldn't be a problem. If the only difference between the VC and the HD piston is the head, normal or VC, and the body stays the same, i would have the same result with a HD piston. I'll only purchase an HD if it is stronger in terms of materials or quality of manufacturing then the VC. If it's just the same with a different head... i'd rather not. Link to post Share on other sites
Trasher Posted August 1, 2010 Report Share Posted August 1, 2010 Maybe the piston end got loose and that lead to the bending of the piston body... Link to post Share on other sites
Cosmitz Posted August 1, 2010 Author Report Share Posted August 1, 2010 The first time.. agreed, it might have been that.. though i did vice-tighten it. But the second time, after i epoxied the end to the body.. seriously doubt it. Link to post Share on other sites
l96ninja Posted August 1, 2010 Report Share Posted August 1, 2010 The PDI website says that the VC and HD piston shafts are made of a different material. The VC is made of Derlin, and the HD one is made of Duralmin. Link to post Share on other sites
Cosmitz Posted August 1, 2010 Author Report Share Posted August 1, 2010 B↑Hard Piston : you'll get High durability This piston has NO VC,so it's a simple piston but the simple is superior to durability. The body: Made of Duralmin. The Ring: Made of Derlin. The End: Made of Stainless. B↑Vacuum Piston :You'll find this system makes BB straight. The body: Made of Duralmin. The Ring: Made of Derlin. The End: Made of Stainless steel. Same materials. When they talk of durability, probably head-wise.. but really, cracked heads are a non-issue. Link to post Share on other sites
Cosmitz Posted August 3, 2010 Author Report Share Posted August 3, 2010 Received a reply from polarstar and they say the threads themselves were fsked. They don't make bore up parts, so i'll have to haggle with PDI.. and their responce so far has been a very hard 'it's not our fault'. Link to post Share on other sites
kampfzwerg Posted January 24, 2011 Report Share Posted January 24, 2011 Have you found a solution for the piston problem ? Link to post Share on other sites
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