I forgot to add a pic of the piston seal which I replaced after about 2K/3K shots through the HW95.
I forgot to add a pic of the piston seal which I replaced after about 2K/3K shots through the HW95.Chrono data after ARH kit install.ARH Tune Kit Installed after FPS dropped by 50.Created: 04/30/21 06:22 PMDescription: Notes 1: New ARH piston seal installed. Notes 2: Distance to Chrono(FT): 4.00Ballistic Coefficient: .021Bullet Weight(gr): 14.66 grTemp: 75 °FBP: N/A inHgAltitude: 495.00# FPS FT-LBS PF10 718 0.00 0.00 9 718 0.00 0.00 8 717 0.00 0.00 7 713 0.00 0.00 6 720 0.00 0.00 5 716 0.00 0.00 4 718 0.00 0.00 3 714 0.00 0.00 2 717 0.00 0.00 1 709 0.00 0.00 Average: 716.0 FPSSD: 3.2 FPSMin: 709 FPSMax: 720 FPSSpread: 11 FPSShot/sec: 0.0True MV: 716 FPSGroup Size (in): 0.00
That's a shock! I didn't think about the trigger group! probably because I have not had that happen! Factory lube is what has destroyed that piston seal! which is why most of us test fire the rifles we get then tear then down!
Quote from: Mark 611 on May 01, 2021, 03:45:45 PMThat's a shock! I didn't think about the trigger group! probably because I have not had that happen! Factory lube is what has destroyed that piston seal! which is why most of us test fire the rifles we get then tear then down! Yes, several times the rifle would emit a small amount of smoke after a shot when new but still shot consistently. When I removed the Weihrauch spring there was a rear guide BUT nothing on the front, (top hat). There was a thin flat washer inside the front of the piston which the spring butted against. I left this washer installed when I installed the ARH spring which included a rear guide and a front guide. The cocking stroke along with the shot seems to be a lot smoother and the tinny sound is gone. The accuracy is excellent even after the scope was removed/replaced 3 times. I had a problem getting the barrel breech lined up for the washers & bolt so I used a screw driver as a pivot to cock the assembly which allowed me to line up the bolt/holes. Like a big dummy I left the assembly cocked and it dry fired when I was attaching the stock with the trigger guide/screws. Scared the heck out of me BUT lesson learned.
I think that lube makes those seals soft, and it heats up from the firing cycle it cooks the seal! I also think its a bad mix of the compound they used during the making of the seals, or they were heated to long in the forming process!, I see mold marks in these factory seals all the time! that indicates to me something in the process in not exactly right? just my thinking on this