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I was at my daughter and son-in-law's house in Gilroy California on a visit back in April of 2006 when I ordered a Bam B-20 and a Baikal MP-513, over the internet, to bring back to the Philippines when I returned home.  While waiting for the guns to arrive I didn't have anything to shoot so on a whim I went to Big 5 and got a Crossman 1377.  I had owned one back in my early teen years and remembered it fondly as a fun shooter and most of all cheap.  Not wanting to alarm my daughter's neighbors I shot it on 3 pumps in the garage using a steel electrical box filled with plumber's putty as a silent trap.
Rignt now it sports the 1399 shoulder stock, of course, a .177cal 24"barrel that's been cut down to 18" and re-crowned, a  1389 backpacker forearm,  a homebrew trigger sear, a Crosman steel breech and bolt for the .177 cal barrel, a
 
 
You could take the notch rear sight and turn it over to get a peep sight.  I found I got much better accuracy with the peep sight.   Problem was holding steady with the pistol close enough to my eye to use the peep.  Eureeka!!   A few days later I had a 1399 Crossman stock from Pyramydair and she was shooting cloverleafs at about 20 feet diagonaly in the garage. 

While I was surfing the web looking for Crosman stuff I came across the "Green" Forum where I learned about just how much you could do to mod this cheap toy airgun.  I want to publicly thank the folks on the "Green" Forum for encouraging my addictive personality traits and helping me to
webmaster steve henshall

Updated:  05/24/07
 
 
Cheap pistol + cheap mods
= Accurate  Carbine
Crosman 1377c Carbine
 
In it's current incarnation is shoots about 3/8" average ctc groups.  Power is moderate I get full penetration through both sides of a tin can at 25 meters on 15 pumps and with an added spring guide/hammer weight  with 25 pumps it about equals the B-20.  15 pumps is my best power level for best accuracy.. 
 
A littlle better view of the fore-stock and the two piece scope rings.  I tried one piece scope mount but it makes loading the pellet a bit tricky and with almost no recoil it's not neccessary.  The 1377 Carbine and scope weigh in at 4.8 5lbs or 2.2 kilos.  Its a very light package and with the home made sear it has a true two stage pull that is about a pound  with about a pound and a half second stage.  All in all very comfortable and easy to shoot.
Overall Impressions.
I have to preface this section on the Crosman 1377 airgun with a bit of history. 
Photo blatently stolen from Pyramydair
spend huge amounts of money to buy after market parts, to have parts machined and to stay up half the night in the garage with saw, file and sandpaper creating all sort of wonderous and magical devices to put into a simple $50.00 toy.   It simply boggles the mind!
Crosman black trigger shoe, fully modded valve with light spring, an adjustable steel cone type  piston that was locally machined, a home brew 1/2" x 7" friction fit silencer and a Winchester non-AO  3 - 9 x 32 airgun scope.
Quick release pump arm pivot pin
Trigger shoe
Bolt probe
Steel adjustable piston
Click pic to enlarge.
 
 
They say the proof of the pudding is in the eating and for me the test is always accuracy.  I popped off this group this morning  rested at about 11:20am.  Just over 3/8" ctc.  Thats 5 shots at 25 meters.  Sometimes they are bigger and some times they are smaller.  My
best groups are under 1/4" but they are not common.  The gun can do it consistently but I can't.  For me, the carbine will never be finished.  That's a big part of the enjoyment.  This little cheapie POS toy airgun has turned out to be the most accurate airgun of the 10 I own.    
The Crosman 1377c has to be one of the most versitle airguns around.  Leave it stock and it outshoots many pistols costing 3 or more times it's low price.  You can find them used for next to nothing all over the place.  Parts are available and they are cheap.  You can mod it a little or a lot.  Some folks on the "Green" forum have over $800.00 in their 1377s.  These things are barely recognisable as decendants of the original.  Mod it a little and get great improvements over the stock gun, for less than $100.00 over the initial cost of the airgun.

Light, accurate, hard hitting (if you need it), adjustable power, self contained and parts are available cheap.  Only drawback is you have to pump it but that's free excercise for us older folk and I don't mind that at all myself.

This one's a "Classic"  winner in my book.

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