Abstract: A firearm or a firearm retrofit assembly to provide the firearm with gas compensation to reduce recoil, wherein a barrel of the firearm or firearm retrofit assembly includes a length having an egress for gas propelled from a chamber inside the barrel, the firearm or a firearm retrofit assembly includes a compensation device to mount in front or behind a front wall of a slide associated with the barrel, the compensation device including: a first side having an opening arranged to fit around a length of the barrel; and a second different side having an opening to expose the egress of the length of the bore.

Abstract: A rechargeable battery pack includes a rechargeable battery, electrical circuitry, and an inductive coil for wirelessly transmitting power to an electronic device. The rechargeable battery pack further includes a first set of electrical contacts to interface with electrical contacts of a charging base. The rechargeable battery pack is programmed to transmit a first data communication including a first identification code to the charging base through the first set of electrical contacts and receive first electrical power from the charging base if the identification code is verified. The rechargeable battery pack includes a second set of electrical contacts positioned on a top surface of the rechargeable battery pack for providing second electrical power to a second instance of the rechargeable battery pack. The second electrical power provided to the second instance of the rechargeable battery pack is a portion of the first electrical power received from the charging base.

Abstract: A rechargeable battery pack system includes a charging base and rechargeable battery packs. The charging base includes an electrical connector for receiving electrical power and a set of electrical contacts. The rechargeable battery packs each include a rechargeable battery, electrical circuitry, and an inductive coil for wirelessly transmitting power to an electronic device. The rechargeable battery packs each include a first set of electrical contacts to electrically contact the charging base for receiving electrical power from the charging base when the battery pack is stacked on top. The rechargeable battery packs further include a second set of electrical contacts for providing electrical power to another rechargeable battery pack when the other rechargeable battery pack is stacked on top. The second set of electrical contacts is activated for providing the electrical power to the other rechargeable battery pack only after receiving a proper identity code from the other rechargeable battery.

Abstract: A protective case system includes an extendable device grip and a protective case. The extendable device grip includes an attachment mechanism and has a stowed configuration and extended configuration. The protective case includes a shell and a receiver. The shell is configured for receiving and removably retaining an electronic device. The shell has at least a back wall and side walls. The outer surface of the back wall of the shell includes a recessed or concave area. The extendable device grip is removably attachable to the receiver for removably attaching the extendable device grip to the protective case. The receiver is positioned in the recessed or concave area of the back wall of the shell such that at least a portion of the extendable device grip is within the recessed area when the extendable device grip is attached to the protective case and is in the stowed configuration.

Abstract: A protective case system includes an extendable device grip and a protective case. The extendable device grip includes an attachment mechanism and has a stowed configuration and extended configuration. The protective case includes an inner shell having a receiver and an outer cushion layer. The inner shell is configured for receiving and removably retaining an electronic device. The extendable device grip is removably attachable to the receiver for removably attaching the extendable device grip to the inner shell. The outer cushion layer first over the inner shell and includes an aperture for accessing the device grip when the extendable device grip is attached to the inner shell.

Abstract: A rechargeable battery pack includes a rechargeable battery, electrical circuitry, and an inductive coil for wirelessly transmitting power to an electronic device. The rechargeable battery pack further includes a first set of electrical contacts to interface with electrical contacts of a charging base. The rechargeable battery pack is programmed to transmit a first data communication including a first identification code to the charging base through the first set of electrical contacts and receive first electrical power from the charging base if the identification code is verified. The rechargeable battery pack includes a second set of electrical contacts positioned on a top surface of the rechargeable battery pack for providing second electrical power to a second instance of the rechargeable battery pack. The second electrical power provided to the second instance of the rechargeable battery pack is a portion of the first electrical power received from the charging base.

Abstract: A rechargeable battery pack system includes a charging base and rechargeable battery packs. The charging base includes an electrical connector for receiving electrical power and a set of electrical contacts. The rechargeable battery packs each include a rechargeable battery, electrical circuitry, and an inductive coil for wirelessly transmitting power to an electronic device. The rechargeable battery packs each include a first set of electrical contacts to electrically contact the charging base for receiving electrical power from the charging base when the battery pack is stacked on top. The rechargeable battery packs further include a second set of electrical contacts for providing electrical power to another rechargeable battery pack when the other rechargeable battery pack is stacked on top. The second set of electrical contacts is activated for providing the electrical power to the other rechargeable battery pack only after receiving a proper identity code from the other rechargeable battery.

Abstract: A protective case system includes an extendable device grip and a protective case. The extendable device grip includes an attachment mechanism and has a stowed configuration and extended configuration. The protective case includes an inner shell having a receiver and an outer cushion layer. The inner shell is configured for receiving and removably retaining an electronic device. The extendable device grip is removably attachable to the receiver for removably attaching the extendable device grip to the inner shell. The outer cushion layer first over the inner shell and includes an aperture for accessing the device grip when the extendable device grip is attached to the inner shell.

Abstract: A protective case system includes an extendable device grip and a protective case. The extendable device grip includes an attachment mechanism and has a stowed configuration and extended configuration. The protective case includes a shell and a receiver. The shell is configured for receiving and removably retaining an electronic device. The shell has at least a back wall and side walls. The outer surface of the back wall of the shell includes a recessed or concave area. The extendable device grip is removably attachable to the receiver for removably attaching the extendable device grip to the protective case. The receiver is positioned in the recessed or concave area of the back wall of the shell such that at least a portion of the extendable device grip is within the recessed area when the extendable device grip is attached to the protective case and is in the stowed configuration.