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Defective product alerts: Guarder polycarb piston head, M14 cylinder head

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Old November 3rd, 2006, 01:49   #1
MadMax
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Defective product alerts: Guarder polycarb piston head, M14 cylinder head

I hate making these posts because it means I have to discontinue inventory that I already carry and sometimes they sound like I'm slagging an otherwise fine airsoft supplier.

Truth is that I purchase a LOT of Guarder products and they're generally pretty good. Because I put so much of their stuff into the field (either myself or thru sales at ASCA) we get to capture most of their defects. There's a lot of defective airsoft junk out there that isn't Guarder and doesn't get caught (or perhaps screamed about) so I hope I don't let this alert reflect on Guarder's entire lineup.

We try to catch bad products and keep them out of our inventory, but it's hard to keep a hawk like watch on over 600 line items.

POLYCARB PISTON HEADS

http://www.intrudershop.com.tw/mmc/i...E-04-03_01.jpg

Nice looking ventilated piston head with a machined brass insert for the screw to tap into. However polycarbonate has not shown itself to be sufficiently fatigue resistant for the repetitive hammering in a mechbox.

Colin_S has broken two piston heads in his M14 and P90. I have found that the piston material is not very impact resistant in tests at the shop.


M14 CYLINDER HEADS

http://www.intrudershop.com.tw/mmc/i...E-04-17-01.jpg

Shiny stainless steel cylinder head with double orings. Problem with them is the adhesive used to retain the rubber pad on the rear face is not strong enough. The rubber pads can come off and rotate so the eccentric bore doesn't match with the cylinder port which results in reduced fps.

I've attacked the rubber pads on other cylinder heads (M4 etc) and found them to have much better adhesive. They're well secured. I suspect the issue with the M14 cylinder is temporary since Guarders supplier appears to be quite able to manufacture similar cylinders with pads which stick.
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Last edited by MadMax; November 3rd, 2006 at 05:53..
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Old November 3rd, 2006, 02:06   #2
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oh No! I bought that piston head from ASCA. Damit I have to open my gbox now. Thanks for the info.
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Old November 3rd, 2006, 11:29   #3
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Good thing I have a lot of junk in my place, it's fun to be a beta tester. I like Guarder products too, it's a shame some of their stuff recently has flaws.

Thanks for informing the community!
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Old November 3rd, 2006, 12:28   #4
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what were you running colin?
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Old November 3rd, 2006, 12:37   #5
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Quote:
Originally Posted by Tankdude View Post
what were you running colin?
I guess you mean spring? In the M14 I was using a Guarder SP110 (with a couple of coils cut off so it's shooting 400fps), I wasn't as surprised this piston head broke although I did expect it to last longer than three field games. The P90 is only using a Guarder SP90 and is shooting 340 fps. What's surprising about the P90 is, I fielded it twice and the second time it was only used for about a quarter of the day.
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Old November 3rd, 2006, 12:39   #6
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nuts. I have a SP110 in mine. If she breaks she breaks. I'll carry the stock piston head with me in the field.

Oh, what changed when it broke? FPS? sound? Flames shooting out the magwell?
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Old November 3rd, 2006, 12:49   #7
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Quote:
Originally Posted by Tankdude View Post
nuts. I have a SP110 in mine. If she breaks she breaks. I'll carry the stock piston head with me in the field.

Oh, what changed when it broke? FPS? sound? Flames shooting out the magwell?
When the piston head broke the M14 didn't make a sound or change FPS, it simply seized up. What happened was some of the plastic shards from the piston head got caught up in the gears, then the fuse blew.
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Old November 3rd, 2006, 20:25   #8
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Darnit! I have to really open my gearbox now. I have a game tommorow. So far my Aeg has been to Keystone 2.5 and a couple of games here. I am not gonna wait for that piston head to break.
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