Well, since no one has jumped in I'll venture a guess. I have a B22 FV and I've read that the Butler Creek 25 round mag will work, but you may need to "adjust" either the mag or the chassis to make it be Reliable. I haven't bought one to see 'cause I bought 2 standard mags for a bit less than the cost of 1 25-round mag. And the mags don't stick out a foot. And loading 3-10s takes almost the same time as the 25 would. TIP - I load a snap-cap as 'last round' to avoid dry-fires.
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