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I use arms on my m25. I use bobro one piece mounts on my pcp bullpups. They have adjustable tension to customize the fit to your rail and repeat zero very well. There are similar mounts made by other manufacurers, but I have no experience with other brands.
If we're talking about one piece scope mounts, I've been using LaRue Tactical cantilever style scope mount LT104 SPR for a while. I also recently picked up one of their QD C.A.N. mount for a new airgun.
My favorite QD mounts are made by LaRue. These are more expensive than ARMS but I believe they are simply the best. The plus is that you get to deal with Mark LaRue, a good guy - Texan through and through. Probably overkill for any AG application however.