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might finally put the old 18" is the optimum barrel length to bed quote you see so often
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https://www.pyramydair.com/blog/2017/12/crosman-2400kt-co2-air-rifle-part-11/

Parts 10 & 11 deal with barrel length.

What he calls the "power valve" is a base 2240 valve.  The other is a 2300 target pistol valve which is a lower power/higher shot valve.

Re 13xx the numbers will vary but the principle is the same.  Longer barrel=more power/FPS.

Accuracy is determined by the quality of the barrel, not the length. 
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Crosman air pistol - General discussion / Re: Cleaning vintage 1377 barrel?
« Last post by ped on Yesterday at 12:45:32 PM »
first thing I'd do is see if it shoots straight and is accurate if it is I'd get a roll your own cig filter add some oil to it and shoot it repeating twice then twice more with un oiled ones then check it against a target see it shoots straight still-you may need to put a few through it to test but that's the fun bit
if you know the barrel is full of crap take it off an give it a good pull through -if it's a 94 then it'll be a phase 2 with plastic breech but even if it has an early phase 1 barrel and breech remove the probe and pull through till clean then re lead it again the fun part
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Wallyworld has Umarex cleaning kits and sometimes they have .177 one piece cleaning rods.
I found the cable type pull through of the Umarex kit pretty much useless but the swabs and plastic bristle brushes work fine with my rod.

The plastic bristle brush is best to use when cleaning any barrel that you can't get to the breech end. The bronze brushes would get stuck trying to withdraw them.

I use lighter fluid as a solvent for pellet and oil residue, brushing well then swabbing, rinsing out the swab each time, then fire a few wads of tissue or cut off cotton swabs through the bore.
Don't oil the bore afterwards.
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Crosman air pistol - General discussion / Re: springs
« Last post by CraigH on Yesterday at 01:19:42 AM »
Thanks, Bill!    The Discovery and Maximus need further research, the Discovery is rumored to have been changed.   The only way to clarify is measurement of various age Discoveries or order springs from Crosman.   Parts order invoices show the spring specifications.   I don't know if Crosman customer service can see the specifications when given a part number.
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Crosman air pistol - General discussion / Re: springs
« Last post by BillK on Yesterday at 12:18:27 AM »
Thanks, Craig.  Excellent info. :-* :-* 
Hope we @ CAPOF can save that somewhere.
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Crosman air pistol - General discussion / Re: springs
« Last post by CraigH on December 16, 2017, 11:16:58 PM »
Here are the stock Crosman 0.300" diameter springs:

2240/2250/2260 --   0.030" wire, 2.015" long

2300S (with PA)  --   0.028" wire, 1.935" long

1377/1333/2289  --   0.035" wire, 1.950" long

2100/2200          --   0.036" wire, 2.405" long

Discovery            --   0.035" wire, 2.250" long

Maximus              --   0.045" wire, 1.55" long    (this last approximate)

HTH
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Crosman air pistol - General discussion / Cleaning vintage 1377 barrel?
« Last post by Maury on December 16, 2017, 08:58:55 PM »
My 1377, vintage 1994,  probably has never bee properly cleaned (or had much in the way of any other  maintenance before I got it).  I have followed advice here about oiling (just got a quart of non-detergent 30 oil, as suggested).  Now about barrel: I am assuming there is some build up in it there of stuff that should be removed.  Any advice on how to properly proceed would be moat appreciated!
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Crosman air pistol - General discussion / Re: springs
« Last post by Maury on December 16, 2017, 08:35:39 PM »
I picked up a box of about 75 springs, assorted sizes for just under $5.00 at local Home Depot.  One of them is a fit for the sere spring in my 1377.
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Crosman air pistol - General discussion / Re: Appreciation
« Last post by RetatCDude on December 15, 2017, 03:49:01 PM »
Rich knows what I think of his work and his help for everyone here.
Have a great year shooers. :)
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