Is there any maintainance required for a PTW?
Yes there is. Thankfully, your only real maintainance is in the cylinder, barring a failure in any other part of the gun. Cylinders manufactured up to mid-2007 (round nozzle interior) used Viton o-rings for the nozzle and piston head. The life expentancy of the nozzle o-ring was about 5000-10,000 rounds, or when double or misfeeding would occur. This requires replacement, and good practice is to re-lube the cylinder at the same time. This keeps your shots consistant in velocity. Use Systema cylinder grease only, as silicone greases used in other AEGs does not allow for as good of a seal for the piston head o-ring (I tried it in my old M90 with poor results). New cylinders manufactured from mid-2007 until current (hexagonal nozzle interior) use polyurethane nozzle o-rings, which have a significantly longer lifespan. No data is avaliable at this time on expected lifespan. The cylinder rebuild kits can be had from a Systema parts dealer for about $12 in Canada. If you require new o-rings
