An accessory mount or interface adapter having a rail for removably mounting an accessory to a firearm, the accessory mount being removably securable to a recurved trigger guard of a firearm without necessarily utilizing other structural features of the firearm for effecting the securement. The clinical panel of the invention contains at least one pair of oligonucleotides, whereby both oligonucleotides of the pair are suitable for use as primers for the amplification by means of polymerase chain reaction of one or both complementary strands of a DNA segment of a human infectious agent or human mitochondria DNA containing a mutation. The inner module also includes a connecting portion to connect the first cylindrical portion to the second cylindrical portion. In one aspect, an output of the regulator is provided between a positive voltage line and a return line. The surfactantsolvent system according to the invention is suitable for the preparation of liquid active substance formulations.