Air Arms Owners Club

Well, I dropped in the kit with the Walther piston and seal as well as the shortened transfer port compression tube. The rear guide is also machined into the trigger block. There were three springs in 3 different lengths with the longest being stouter as well. I chose the middle length spring with 1 spacer up the piston. Nice shot cycle, but the chrono was 700 fps with 8.44 Exacts. I put in the longer stout spring, but it was coil bound with the supplied rear guide spacer. I removed the spacer and found a thin washer. It now cocks and shoots at 750 fps, but with major boing. This shocked me because the guides are nice and snug. I put the middle spring back in as well as all 5 spacers in the piston and the extra thin washer I had on the rear guide. Shot cycle is even better and the gun just feels right. Trouble is, it's too dark to get a chrono reading. If it's putting out 750 I'll be very happy as it should pick up a good bit as it runs in. The parts are very tight with this spring. I know it's all about making the lost volume go away and making for the most efficient power plant. I must say that I'm very doubtful the current set up will ever reach 12 ft. lbs. and I can't see being able to put enough spring in to make it so. Luckily, I can shoot a long stroke FAC TX200 just as well as most shoot their modded guns. If I need to change I will do so. My take on all this is, learn to shoot your gun because all the nice kits won't make you a better shot. I'm still hopeful, but I would like a bit more speed than 700 fps.

FPoole wrote:Well, I dropped in the kit with the Walther piston and seal as well as the shortened transfer port compression tube. The rear guide is also machined into the trigger block. There were three springs in 3 different lengths with the longest being stouter as well. I chose the middle length spring with 1 spacer up the piston. Nice shot cycle, but the chrono was 700 fps with 8.44 Exacts. I put in the longer stout spring, but it was coil bound with the supplied rear guide spacer. I removed the spacer and found a thin washer. It now cocks and shoots at 750 fps, but with major boing. This shocked me because the guides are nice and snug. I put the middle spring back in as well as all 5 spacers in the piston and the extra thin washer I had on the rear guide. Shot cycle is even better and the gun just feels right. Trouble is, it's too dark to get a chrono reading. If it's putting out 750 I'll be very happy as it should pick up a good bit as it runs in. The parts are very tight with this spring. I know it's all about making the lost volume go away and making for the most efficient power plant. I must say that I'm very doubtful the current set up will ever reach 12 ft. lbs. and I can't see being able to put enough spring in to make it so. Luckily, I can shoot a long stroke FAC TX200 just as well as most shoot their modded guns. If I need to change I will do so. My take on all this is, learn to shoot your gun because all the nice kits won't make you a better shot. I'm still hopeful, but I would like a bit more speed than 700 fps.

You just wouldn't believe that would you. What grease were you using?

BBF

Used a very light application of JM's moly lube. These TX's never cease to amaze me with what I think they should do and what they actually do. I once had a fairly loose steel guide on an FAC TX and it shoot with no twang at all. I'm going to give this a full run in to see if it picks up to near 12 ft. lbs. and it is nice with the one spring. I can always use the other spring on another gun to see what happens.

I went out and did some extensive shooting today. I put at least 200 shots through the new kit. I think the gun is now right up around 760-770 fps with Exacts. I got this figure from a trajectory program as it takes about 56 1/8" clicks at 55 yards when zeroed at 26 yards. Getting better as it beds in and expect it to climb a bit more. The wind was pretty bad today with gusts above 30 mph, but the accuracy at my zero range of 26-27 yards was apparent.