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tempermental 1377

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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tempermental 1377

Unread postAuthor: jon_89 » Tue Aug 11, 2009 6:40 pm

recently my crossman 1377 has been a p.i.t.a. its accurate one shot than the next one its a half a mile off. im using a red dot sight with crosman mounts. also the gun has power issues meaning its good once than the next shot i get a pellet wizzing by my ear. any ideas are greatly appreciated.
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Unread postAuthor: hi » Tue Aug 11, 2009 6:51 pm

try taking the red dot sight off if there are irons on it. Cheap red dots are more for looks than anything. a good quality red dot is going to be very expensive.

try different ammo too and see if that helps.
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Unread postAuthor: jon_89 » Tue Aug 11, 2009 6:56 pm

is a $40 bsa red dot cheap. tried different pellets. even set the gun a some pillows for a steady shot still no differance.
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Unread postAuthor: jrrdw » Tue Aug 11, 2009 6:57 pm

Have you oiled the seal? That might exsplain the power problems???
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Unread postAuthor: Gippeto » Tue Aug 11, 2009 7:19 pm

With the gun pumped up, loaded and the breach covered with a kleenex, fire in a safe direction. Does the kleenex get blown around?

I've seen a 2289 barrel band shift around while pumping, causing large shifts in poi.

Does it pump up "normally"? Can you hear hissing with the gun pumped up and the breach open?

How about a list of any mods done.
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Unread postAuthor: jon_89 » Wed Aug 12, 2009 12:14 am

what kind of oil should i use? unfortulantly it still remains stock. keep talking about modding but no time.
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Unread postAuthor: jonnyboy » Wed Aug 12, 2009 12:20 am

jon_89 wrote:what kind of oil should i use? unfortulantly it still remains stock. keep talking about modding but no time.


Silicon oil works well with o rings.
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Unread postAuthor: Gippeto » Wed Aug 12, 2009 12:22 am

Use SAE 30 non detergent (Usually 4 stroke lawn mower oil) or crosman pelgun oil.
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Unread postAuthor: jon_89 » Wed Aug 12, 2009 12:48 am

Now do I just put a drop in the pump?
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Unread postAuthor: jrrdw » Wed Aug 12, 2009 2:24 am

If you look closely with the pump open it will have a little arrow saying oil here, 3 drops on the felt peice. Look in the owners manual or online at crossmans website.
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Unread postAuthor: Moonbogg » Wed Aug 12, 2009 2:26 am

Accuracy issue sounds like a filthy barrel to me. I actually have one of those things lying around in my closet from who knows when. Clean the barrel and check the acurracy again. Use Iron sights or even no sights since that red dot might be loose. Barrel dirt might affect power as well, not too sure though. Not just dirt actually, it could be hardened grime that needs a good degreasing and cleaning.
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Unread postAuthor: jackssmirkingrevenge » Wed Aug 12, 2009 2:30 am

Moonbogg wrote:Accuracy issue sounds like a filthy barrel to me


I think it's more likely to be a power issue, ideally you get a chronograph and see how consistent it is. If it isn't, then your pump is either not taking it to the same pressure every time, there's a leak in the chamber or you have a stick valve/hammer setup.
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Unread postAuthor: jon_89 » Wed Aug 12, 2009 6:53 pm

Where can I get silicone oil at?
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Unread postAuthor: jrrdw » Wed Aug 12, 2009 8:14 pm

Auto parts store. I've used cooking oil before and it worked well.
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Unread postAuthor: Technician1002 » Wed Aug 12, 2009 8:27 pm

jrrdw wrote:Auto parts store. I've used cooking oil before and it worked well.


Cooking oil turns rancid. Avoid it. It becomes acidic and corrosive over time exposed to air.
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