The BAM guns are copied from other successful guns. BAM and the importer Xisico make no secret of this.
In particular, the B26 is an improvement over the first effort to make a copy of the Beeman R9.
The R9 is one of the best spring air rifles ever made, and the B26 is a pretty good copy by all reviews. It has a good trigger (a copy of the Rekord trigger), and is accurate.
For me, I like its size and its styling, and it is hefty but not heavy. Easy enough to lift and support for off-hand shooting.
model length weight (lb)
OA barrel modeled after
B21 49.1 20 9.9 RWS model 48
B26 43 16 7.3 Beeman R9
B30 44.5 17.3 9.4 RWS 48 (shorter)
The B26 is more of a carbine, and lighter. Not quite as much power, but very accurate, has a good trigger.