To improve reliability with a M41, do a search here and look for my posts about the $11 Volquartsen extractor. IMHO it solves most extraction, stove-piping and jamming issues with this model. This applies to ALL M41's (vintage or new) - even if they are right out of the box!! Midway sells them for $11 bucks and installation is simple and should take no more than 15 minutes. IMHO it's the single most important and meaningful upgrade one could do to his M41! They are FAR superior to the stamped out Factory part!!!