Firearm magazine extension with locking plate

1. A device implementable on a firearm, comprising:

a magazine extension housing attachable to a bottom opening of a magazine body of a magazine that is implementable on the firearm, the magazine extension housing comprising a cavity configured to receive the magazine body when the magazine extension housing is attached to the bottom opening of the magazine body, the magazine extension housing further comprising a rear sidewall having a slot adjacent the cavity and separated from the cavity by at least a portion of the rear sidewall and

a locking plate removably inserted into the slot of the rear sidewall of the magazine extension housing with the locking plate generally extending vertically with respect to the magazine extension housing and with an edge of a flange-shaped hook of the locking plate bent and pointing inwardly toward the magazine body such that the edge of the flange-shaped hook of the locking plate is configured to exert a force on the magazine body to lock the magazine extension housing to the magazine body when the magazine extension housing is attached to the magazine body of the magazine.

2. The device of claim 1 , wherein the locking plate comprises a metal locking plate.

3. The device of claim 2 , wherein the metal locking plate is made of steel or alloy.

4. The device of claim 1 , wherein the magazine extension housing is configured with a slot, and wherein the locking plate is at least partially inserted in the slot when the locking plate is received in the magazine extension housing.

5. The device of claim 4 , wherein the locking plate has a first distal end and a second distal end opposite the first distal end, and wherein, when the locking plate is received in the magazine extension housing, a portion of the locking plate toward the first distal end is inserted in the slot while another portion of the locking plate toward the second distal end is exposed.

6. The device of claim 5 , wherein the second distal end of the locking plate is curved to form the hook, and wherein, with the second distal end of the locking plate hooking onto a back sidewall of the magazine body when the magazine extension housing is attached to the magazine body, the locking plate locks the magazine extension housing in place by pressing down onto the back sidewall of the magazine body with the hook.

7. The device of claim 6 , further comprising:

a set screw,

wherein the magazine extension housing is further configured with a threaded through hole through which the set screw is inserted to lock the locking plate in place.

8. A device implementable on a firearm, comprising:

a magazine extension housing attachable to a bottom opening of a magazine body of a magazine that is implementable on the firearm, the magazine extension housing comprising a cavity configured to receive the magazine body when the magazine extension housing is attached to the bottom opening of the magazine body, the magazine extension housing further comprising a rear sidewall having a slot adjacent the cavity and separated from the cavity by at least a portion of the rear sidewall

a set screw; and

a locking plate removably inserted into the slot of the rear sidewall of the magazine extension housing with the locking plate generally extending vertically with respect to the magazine extension housing and with an edge of a flange-shaped hook of the locking plate bent and pointing inwardly toward the magazine body such that the edge of the flange-shaped hook of the locking plate is configured to exert a force on the magazine body to lock the magazine extension housing to the magazine body when the magazine extension housing is attached to the magazine body of the magazine,

wherein the magazine extension housing is configured with a threaded through hole through which the set screw is inserted to lock the locking plate in place.

9. The device of claim 8 , wherein the locking plate comprises a metal locking plate.

10. The device of claim 9 , wherein the metal locking plate is made of steel or alloy.

11. The device of claim 8 , wherein the magazine extension housing is further configured with a slot, and wherein the locking plate is at least partially inserted in the slot when the locking plate is received in the magazine extension housing.

12. The device of claim 11 , wherein the locking plate has a first distal end and a second distal end opposite the first distal end, and wherein, when the locking plate is received in the magazine extension housing, a portion of the locking plate toward the first distal end is inserted in the slot while another portion of the locking plate toward the second distal end is exposed.

13. The device of claim 12 , wherein the second distal end of the locking plate is curved to form the hook, and wherein, with the second distal end of the locking plate hooking onto a back sidewall of the magazine body when the magazine extension housing is attached to the magazine body, the locking plate locks the magazine extension housing in place by pressing down onto the back sidewall of the magazine body with the hook.

14. A device implementable on a firearm, comprising:

a magazine comprising a magazine body configured to hold a plurality of rounds of ammunition cartridges;

a magazine extension housing attachable to a bottom opening of the magazine body of the magazine, the magazine extension housing comprising a cavity configured to receive the magazine body when the magazine extension housing is attached to the bottom opening of the magazine body, the magazine extension housing further comprising a rear sidewall having a slot adjacent the cavity and separated from the cavity by at least a portion of the rear sidewall and

a locking plate removably inserted into the slot of the rear sidewall of the magazine extension housing with the locking plate generally extending vertically with respect to the magazine extension housing and with an edge of a flange-shaped hook of the locking plate bent and pointing inwardly toward the magazine body such that the edge of the flange-shaped hook of the locking plate is configured to exert a force on the magazine body to lock the magazine extension housing to the magazine body when the magazine extension housing is attached to the magazine body of the magazine.

15. The device of claim 14 , wherein the locking plate comprises a metal locking plate.

16. The device of claim 15 , wherein the metal locking plate is made of steel or alloy.

17. The device of claim 14 , wherein the magazine extension housing is configured with a slot, and wherein the locking plate is at least partially inserted in the slot when the locking plate is received in the magazine extension housing.

18. The device of claim 17 , wherein the locking plate has a first distal end and a second distal end opposite the first distal end, and wherein, when the locking plate is received in the magazine extension housing, a portion of the locking plate toward the first distal end is inserted in the slot while another portion of the locking plate toward the second distal end is exposed.

19. The device of claim 18 , wherein the second distal end of the locking plate is curved to form the hook, and wherein, with the second distal end of the locking plate hooking onto a back sidewall of the magazine body when the magazine extension housing is attached to the magazine body, the locking plate locks the magazine extension housing in place by pressing down onto the back sidewall of the magazine body with the hook.

20. The device of claim 19 , further comprising:

a set screw,

wherein the magazine extension housing is further configured with a threaded through hole through which the set screw is inserted to lock the locking plate in place.