Just in case you did not see this elsewhere....

The CPSC announced a recall of the 5G. Here's the link.....

http://www.cpsc.gov/cpscpub/prerel/prhtml08/08265.html

Bad sear engagement? Are these the standard model five design that has been given a stronger spring? Maybe it's too much for it?

Here is a link that gives a little more info.

http://www.network54.com/Forum/79537/message/1207616329/Umarex+Recall+on+5G+Magnum

Also, here is the link to the UMAREX recall notice.

http://www.umarexusa.com/Recallinfo.html

Sounds like a possible defective piston.

I can see where a soft surface would eventually wear down. Ah, the quest for more power!