Hello Gabi,Thanks for your kind words...like you I also have a hammer spring in my rifle that has several coils cut off so it is shorter. This supposedly provides a better shot curve because the hammer is not slamming the valve all the way open each time you shoot it. I am only guessing, but I am thinking maybe reasoning is that the longer factory spring opens the valve too much, and maybe this causes air to be wasted for each shot? I guess this is supposed to somehow act sort of like a regulator to the air valve? All I know is that I have shot thousands and thousands of pellets through my rifle - over my chronograph- with the shorter spring installed and with the longer original factory O.E.M. spring installed, and I personally cannot discern any real appreciable difference. I think the money I paid for having this done would have been better spent elsewhere. I will explain below...When I first received my Sumatra two years ago I sent it to some guy in to be "tuned". Not having had any knowledge of what a "tune" really meant at the time. But at this point in time I can completely disassemble and reassemble my own Sumatra virtually blindfolded in about twenty minutes. So I now know what he did to my rifle for the $225.00+$50.00 shipping, and about eight weeks of waiting for it to be returned to me.One of the things he did was cut the hammer spring shorter...and another thing he did was to use a Dremel tool or reamer or something similar to reshape the hole in the top of the transfer port and the hole in the barrel where the transfer port meets it. He reshaped these holes from the original round holes to oval shaped holes...I am guessing that his reasoning was to let more air into the barrel for each shot to give it more power?Another thing the guy tried to do for me was to cut off the front sight blade and install a fiber optic front sight. He only charged me $150.00 fee for doing this, plus the money it cost him to buy a Williams front sight from Brownell's; This would normally entail cutting a "female dovetail" into the front sight ramp so the "male" on the bottom of the Williams sight can be inserted. However, on mine the dovetail was cut way to large and the new sight looked like it had been glued in place with something?Well the first time I went to shoot my rifle at the range when I got it back from him the front sight feel off on the floor, and I noticed a big blast of air came out of the breach area! Yea, it was a completely amateurish butcher job! Since he wasn't interested in having me send my rifle back so he could fix the problem, I sent pictures of what he had done to the front sight band to Pyramyd to find out how to fix my rifle. (I am happy to say that I was informed by Pyramyd that they would no longer be recommending his services to their customers).The one good thing to come out of all this was that when I contacted Pyramyd to ask for help they gave me the option of sending it to them to do the repair, or of doing myself (I chose the latter). They sent me a new front sight band for free, and told me to call back when I received it. When FedEx delivered it I called back and I was directed to a person that spent at least two hours on the telephone teaching me how to disassemble my rifle, remove the barrel and damaged front sight band, how to reinstall the barrel and the new sight band, how to install a new air transfer port o-ring that the guy had neglected to install, how to install a new barrel breach o-ring that the guy had neglected to install, how to take my trigger apart to check to see if the guy hurt anything in there, and how to completely reassemble my rifle. You know that when bad things happen sometimes some good can come out of it. Thanks to the wonderful people at Pyramyd I can now disassemble my own rifle to clean and re-lube it, replace the breach seal o-ring that gets worn out, or fix any other problem that it could possibly have. So now I not only know what makes tick, but also how to make her purr like a kitten.... I can also help any of you guys here in the GTA family to fix a problem with your Sumatra should the need ever arise, or if you just want to learn how to work on your own gun. You guys here at GTA have helped me a lot with advice about different things so I am more than happy to help in return. And by the way, the people involved in this story shall remain nameless...so don't even ask. Suffice to say the problems are solved and I came out happy in the end. Or should I say some times your the boot and some times your the @@@!Best regards, Chuckster
You can try to find a Career Ultra 9mm which is the closet thing to a .357 cal Sumatra
Sam Yang 909 and 909s are still made. They're 45 cal single shot guns though. I haven't tried pellets, I shoot 80 gr EPP/UG slugs, .360 round balls and 105 gr wad-cutters from Matt's Bullets.
When you say threaded barrel do you mean threaded end so that LDC fit? If so, yes the end is threaded. Careers have great barrels and are very accurate. Here is a group I shot a couple of weeks ago. I shot on a fieldpod and not a table and was still getting good groups. You have to find them used. This is one of Manny's old hog killing machines LOL.
Hello Reno1,As I stated at the end of my post I Will not name the so called "tuner" that I sent my rifle to...but I may have accidently provided a clue to his identity...just let your common sense guide you. You seem to be a pretty smart fella, so my advice is to "tune" your rifle yourself. This is something you can do all by your self in an afternoon. If you would like to do so just let me know and I will guide you step by step over the phone. You really don't need to open up your transfer port to get more power...think about it, you already have more power than you can use on regular pellets which is why you tried to shoot slugs. If you want to remove your hammer spring and shorten it I can help you do that over the phone in about 10 minutes or less.And yes you can also put me down for a Sumatra in .357 cal. right now today! Hope my answer to your question was helpful...my advice is DO NOT SEND YOUR GUN TO ONE OF THESE CHARLATANS TO "TUNE" IT FOR YOU! You do not need your trigger contact points stoned, polished, or lubed. Your Sumatra is already good for penetrating hog heads...save your money my friend. Think about this point also...when one of those jokers sends your rifle back to you, unless you know how to take it apart to see what was done you truly wouldn't know if anything was really done to it or not! And because your out all that money your tendency is to brag about how much better your rifle shoots and what a great job the joker did on it! Dude its human nature and they know that.I don't need your money, and I won't let you send your rifle to me...but I will teach you how to take it apart and put it back together again so you can work on it yourself. Or you could call Boris at Pyramyd Air and he will teach you how to do so. It is so easy a child could do it. Best regards, Chuckster