GTA
General Discussion To Gateway To Airguns => Gamo Gate => : November 26, 2006, 08:42:18 AM
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I made a shortened .20 walther barrel for one of my Shadows and what a suprise it was when shooting it.
It had a stock .177 barrel and I never even dissembled the rifle except to change the barrel, meaning I did not remove the spring piston and such, just the pivot block and barrel. Before the rifle was shooting 898's with CHP's and now with the 15 inch barrel it shoots .20 caliber 11.2 FTS's
at 791 average. So I lost a little over a hundred fps but gained FPE, 14.1 to 15.5 FPE.
The rifle had been tuned and has a Tarantula spring in it. That's getting close to 17 FPE and it didn't hurt the accuracy at all. The choke on a 17 inch barrel must slow down the pellet but at 15 inches it seems not to do that. I have another .20 Shadow that will do 815's but it has a E2000 spring in it.
Might have to shorten the barrel on that rifle.
ONE drawback,,, with the shorter barrel it's harded to cock!
Here's the cute little .20 carbine and a stock one, and a pic at 50 yards.
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That looks sweet!
have to agree though, on most of my springers I'd like a slightly longer cocking arm....actually I prefer side cockers, but then I've had quite a bit of work done on my left shoulder, so even cocking my RWS M92 (about 20 something lbs) gets old after awhile. Looks like it shoots pretty well even without the choked end of the barrel in place. Cool stuff!
For your next invention you need to make a self cocking springer, then those of us who have minor disabilities like me can enjoy them too:)
Take care,
Dan
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Hey, Dan, you just triggered a hazy memory. I seem to recall reading about a self cocking mechanism for a cross bow somewhere, I think it used a small electric motor. Not that big a leap from string to spring, I'd think. It would have to be a fixed barrel, but maybe put the motor in the butt, with a linkage to the spring shoe. Your'e a tinkerer, there's the basics, go for it! All development costs are up to you, but if it turns out to have a market, I'll expect a 50% cut, what do you think, sound fair ;-)? Of course, thinking that hard almost caused me to break a sweat, so maybe it should be 60%! Seriously, this might be worth playing with. You might want to look at some of the robotics parts sites for more inspiration. Have fun.
Dave
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It does have the choked end I cut and machine the walther barrels and the cut is at the breach end. I did a .177 Walther barrel and it did not respond this way, it just shot the same fps.
The shoulder thing I know all about, just had surgery on mine 2 months ago. I tore mine up pretty good.
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Yup, I've seen crossbow winches also, cool stuff for sure. Think for now I'll stick to CO2 or maybe this stupid little 13XX pistol I'm building. Had a B30 for awhile too, what a brute! I loved looking at that gun, but couldn't stand shooting it. Now it's Joel of Airgun Artisans arm breaker! Maybe I'm just lazy:) Been thinking alot on the lines of selling everything and just buying a multishot PCP...should be ok in my 13 yard backyard range...no? Or maybe an old Crosman 600.....man, those sure are sweet...pop, pop, pop!
If I do ever make a breakbarrel winch you of course get all of the royalties you deserve!
Dan
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Oh, ok, my bust, for some reason I thought you cut the muzzle end off.
Shoulder injuries suck, it's been a good 3 years since mine went kaplooey. My actual injury was a broken funny bone. Split it lengthwise and it wouldn't fit back in the shoulder socket without dislocating and relocating everytime. Now I have this knee, that I really should go get looked at....but then I think,"Maybe I should have them look at my elbow, wrist and foot while I'm there?". Hard to decide which injury to fix first...I'm only 34, but somehow with all of the wrench turning I've done in the last years I've all but ruined my body. Celebrex and Vioxx were great till I found out they make holes in your heart. Good thing my wife is a massage therapist or I'd probably just lay in bed all day:)
Ok, this isn't the "WebMD" website, I'll stop. Great looking gun, and those groups are beautiful!
Dan
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I can feel for you it was in 1966 when I got my knee busted up racing motorcycles and It has been opened up 5 times now.
And my collar bone racing Snowmobles, two ribs "motorcycles", ankle "motorcycles", left arm,
" snowmobles", Yup been there done that, wait till your my age and you will rembember every one each and every morning.
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...to get a barrel made for a different gun? Specifically, I'm thinking of the AR1000 I just bought - the rifle has a lot of good points, but I believe the barrel has not been machined properly.
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If I have the correct dimensions the machining part I can do no problem.
Depends if you would want a blank barrel machined or a barrel off another rifle, I have done both for people.
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...already bored and rifled, and then just machine them down to fit a specific rifle?
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That's correct, I buy what they call a barrel in white, it has all the rifling and it's a choked barrel with a target crown.
They look like just a chunk of round bar with a hole down the center. Just a long tube with no blue or machining of any kind
A choked barrel has the rifleing tapering smaller the last 3/4 inch or so, it's normaly about .002 smaller that the breach end.
That's 2 thousands of an inch and it sizes the pellet as it leaves the barrel making the rifle much more accurate.
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I'll get you the machining dimensions ASAP.
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...just screws out of the breach block? I know that the Legacy is like that as well as the Gamo, but is it common practice?
Or is there a reasonable chance that it's pressed?
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Its to bad you couldnt make me a barrel for my shadow sport. Or maybe you have the means to do it now?
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Most of them unscrew if it's like the Gamo, the barrel pivot bushing keeps the barrel in place and also most are locktited also.
Now I just removed a barrel from a Crossman Quest (chineses rifle) and it was pressed in, it had a small pin near the barrel pivot and the barrel pivot also was holding it in place. I had an inquiry about a .20 barrel for one of them and I just happened to have a junk barrel and pivot block around to dissemble and see.
here's a shot of the Quest/Shadow/CFX barrel ends.
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Pressing or unscrewing? Might try unscrewing.
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I haven't found a way because of the plastic barrel.
I looked at my Nitro 17 which has the plastic barrel and the pivot and barrel assemble from another gamo don't even come close to fitting. it would be nice because you can get a Quest barrel assembly cheap and they are the clone of a shadow.
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My Quest is a decent enough shooter... are they generally made well? Or is their QC rather spotty?
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No the Quest is a decent rifle I have two myself both are good shooting rifles.
Both of mine I tuned and they are a little rough here and there but with a little smoothing here and there they became a nice shooting rifles.