US 2026/0118077 A1Published application

Apparatus and method for readily changing calibers of blind box magazine firearms

OwnerRon DOROMBOZIinventor

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Abstract

An apparatus and method are for readily changing a caliber of cartridges in a firearm that has a blind box magazine well. A first magazine is provided for cartridges of a first caliber. The magazine securely engages the magazine well and has a bottom opening. A spring is provided with a bottom that extends through the opening and securely engages a floorplate, which in turn securely engages the firearm and encloses the magazine. The spring's top securely engages a follower that slides within the magazine. The spring biases the follower towards a feed lip opening at the magazine's top. When the first magazine is detached and removed from the magazine well, a second magazine for cartridges of a second caliber can be inserted into and securely engage the magazine well, thus readily changing the caliber of the cartridges in the firearm.

Claims20

Dependent claims

An apparatus for readily changing a caliber of cartridges in a firearm having a blind box magazine well with a retaining member, the apparatus comprising:

(a) at least one magazine that is sized and adapted for a first said caliber;
wherein the magazine is adapted to securely engage the retaining member, in selectively detachable relation, within the blind box magazine well;
wherein the magazine has a top magazine end portion that is shaped to define a feed lip opening, and a bottom magazine end portion that is shaped to define a bottom opening therethrough;
(b) at least one follower, with said follower being disposed in sliding relation within the magazine;
(c) at least one floorplate member that is adapted to securely engage the firearm and to securely enclose the magazine;
(d) at least one spring that extends through the bottom opening and has:
a bottom spring end portion that securely engages the floorplate member;
and a top spring end portion that securely engages the follower and biases the follower towards the feed lip opening;
and
(e) a limiting member that limits a maximum number of said cartridges that can be held by the magazine;
and
wherein when a first said magazine is selectively detached from the retaining member and removed from the blind box magazine well, a second said magazine that is sized and adapted for use with a second said caliber can securely engage the retaining member, thus to readily change the caliber of the cartridges in the firearm.

9 more elements

A method for readily changing a caliber of cartridges in a firearm having a blind box magazine well with a retaining member, the method comprising steps of:

(a) providing the firearm with at least one magazine that is sized and adapted for a first said caliber;
wherein the magazine securely engages the retaining member, in selectively detachable relation, within the blind box magazine well;
wherein the magazine has a top magazine end portion that is shaped to define a feed lip opening, and a bottom magazine end portion that is shaped to define a bottom opening therethrough;
(b) providing the magazine with at least one follower, with said follower being disposed in sliding relation within the magazine;
(c) providing at least one floorplate member that securely engages the firearm and securely encloses the magazine;
(d) providing at least one spring that extends through the bottom opening and has:
a bottom spring end portion that securely engages the floorplate member;
and a top spring end portion that securely engages the follower and biases the follower towards the feed lip opening;
(e) providing a limiting member that limits a maximum number of said cartridges that can be held by the magazine;
(f) selectively detaching a first said magazine from the retaining member, and removing the first said magazine from the blind box magazine well;
and
(g) providing a second said magazine that is sized and adapted for use with a second said caliber, with the second said magazine securely engaging the retaining member, thus to readily change the caliber of the cartridges in the firearm.

9 more elements

Dependencies are inferred from the claim text.