My .177 Marauder Field and Target has been in a funk for the last year or so. Velocity used to be pretty consistent, usually within 5 fps between shots; that has increased to 15 or more. Shot groups have become inconsistent as well. I suspected it might be the regulator so I replaced the Crosman one with a Huma with really no improvement. I have cleaned and polished the barrel, changed the barrel o-ring, changed the air stripper o-ring (shroud was loose over air stripper), tightened and loosened the shroud with no improvement. I also changed scopes with no improvement. I did notice that after I cleaned the hammer and tube that the hammer became difficult to cock. There is wear (shiny areas) on the top front of the hammer and the bottom rear. I lubed the hammer with a light coating of moly paste and it got much easier to cock but was still inconsistent. I've got over 16000 shots with the rifle so could wear be a factor? Thanks for any advice.
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Marauder FT decline in accuracy
- Thread starter rong1966
- Start date
id say definitely wear could play into it .. first thing id do is clean the hammer, spring and bore area thoroughly with a solvent till its squeaky clean .. then lube things with a dry lube like ptfe powder or tungsten disulfide, no 'pastes' or oils of any kind in that area ..
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I’d say that wear and tear is definitely a factor. After 16K shots your tolerances are NOT going to be what they used to be. It might be time to just replace the rifle.
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I am in the camp that it is basically impossible to wear down an air rifle barrel if shooting standard soft lead projectiles. I think you should go through and do a complete reseal of the rifle and change out all the o rings. More often than not a fresh reseal will get an air rifle back up to par.
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Thanks for the responses, I forgot to mention that I did already replace the o-rings in the air tube, barrel, and air stripper.
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If accuracy is decreasing along with velocity variation, don't forget that changes in the pellets themselves can do that. We often just assume that new tins are like old tins, but that is not always the case . . .
As for wear on the gun, I had a Marauder that I shot probably around 20K rounds thru and the valve stem had worn the valve block increasing clearance. This led to increased variation in speeds and thus a degradation in accuracy. I replaced the valve and was back in business.
As for wear on the gun, I had a Marauder that I shot probably around 20K rounds thru and the valve stem had worn the valve block increasing clearance. This led to increased variation in speeds and thus a degradation in accuracy. I replaced the valve and was back in business.
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