Spring Gun Tuning

[ozzie642]

k, stripped all down, and degreased, noticed a tiny dent on the piston seal, think i may have done that when refitting it, could that cause such a big drop in power as its a very very small dent, if so can you recommend a supplier and any tips on refitting it into the chamber avoiding any damage, also next time i change mainsprings can you recommend a certain make for quality and power, thanks

[Hsing-ee]

k, stripped all down, and degreased, noticed a tiny dent on the piston seal, think i may have done that when refitting it, could that cause such a big drop in power as its a very very small dent, if so can you recommend a supplier and any tips on refitting it into the chamber avoiding any damage, also next time i change mainsprings can you recommend a certain make for quality and power, thanks

If the piston seal is letting air past it, you can expect lower power, harsher recoil and poorer accuracy. I don't know if the 'dent' you mention is letting air past. If you put the piston in the cylinder without the spring, and hold your finger over the transfer port & press the piston forward with a dowel, you should get an idea of whether the piston seal is working well. Cuts on the lip of the piston seal can have a dramatic effect on power.

Maccari in the USA does a nice tuning kit for this rifle -

Usually takes a couple of weeks, but worth the wait. Price depends on exchange rate.

Spring and guides -

http://www.airrifleheadquarters.com/...488/552850.htm

Special piston washer

http://www.airrifleheadquarters.com/...485/945836.htm

good luck

[jumbuck]

If the piston seal is letting air past it, you can expect lower power, harsher recoil and poorer accuracy. I don't know if the 'dent' you mention is letting air past. If you put the piston in the cylinder without the spring, and hold your finger over the transfer port & press the piston forward with a dowel, you should get an idea of whether the piston seal is working well. Cuts on the lip of the piston seal can have a dramatic effect on power.

Maccari in the USA does a nice tuning kit for this rifle -

Usually takes a couple of weeks, but worth the wait. Price depends on exchange rate.

Spring and guides -

http://www.airrifleheadquarters.com/...488/552850.htm

Special piston washer

http://www.airrifleheadquarters.com/...485/945836.htm

good luck

Mr uk litehammer is well into Maccari for his air rifles which are top notch and he knows his stuff so it's got to be quality gear

[mickjjuk]

Will look out for a older model I was a bit unsure about getting parts like seals. But after reading this I will give it a go. Thanks from Mick