Sub-caliber conversion unit

Claim 2

In combination with the receiver of a larger caliber pistol comprising a foremost end portion U-shaped in transverse section, aligned bores adapted to receive a cross pin, spaced and rearwardly extending slide rails, and an integrally formed cross member intermediate said slide rails, a sub-caliber conversion unit comprising a barrel, slide and recoil spring means, said barrel terminating forwardly in a downwardly depending tubular section and rearwardly in a downwardly depending lug, horizontal flats laterally of said lug, said tubular section of said barrel adapted to at least partially insert into the foremost end of said receiver, said recoil spring means abutting selected portions of said slide and said lug, means in said lug adapted to coact with said cross pin whereby said flats are pulled downwardly against said slide rails and said lug is pulled rearwardly against said cross member in said receiver.

Claim 3

The invention of claim 1 including securing means on said tubular section adapted to pass outwardly of the foremost end portion of said receiver.

Claim 4

The invention of claim 1 wherein said recoil spring means at least partially extends forwardly into said tubular section in said barrel whereby a full length recoil spring is utilized.

Claim 5

The invention of claim 1 wherein said means comprise a bore in said lug which is out of alignment relative to the aligned bores in said receiver whereby upon insertion of said cross pin said flats are pulled downwardly against said slide rails and said lug is pulled rearwardly against said cross member in said receiver.

Claim 6

The invention of claim 1 wherein said means comprise a downwardly opening slot in said lug and a spring at least partially restricting passage of said cross pin whereby upon insertion of said cross pin said flats are pulled downwardly against said slide rails and said lug is pulled rearwardly against said cross member in said receiver.

Claim 7

The invention of claim 1 wherein said conversion unit further includes a breech block detachably secured to a selected portion of said slide.

Claim 8

A firearm comprising a barrel, slide, recoil spring means and receiver assembly, said receiver assembly comprising a foremost end portion U-shaped in transverse sectIon, aligned bores adapted to receive a cross pin, spaced and rearwardly extending slide rails, and an integrally formed cross member intermediate said slide rails, said barrel terminating forwardly in a downwardly depending tubular section and rearwardly in a downwardly depending lug, horizontal flats laterally of said lug, said tubular section of said barrel adapted to at least partially insert into the foremost end of said receiver assembly, said recoil spring means at least partially extending into said tubular section of said barrel and abutting selected portions of said slide and said lug, means in said lug adapted to coact with said cross pin whereby said flats are pulled downwardly against said slide rails and said lug is pulled rearwardly against said cross member in said receiver assembly.

Claim 9

A firearm comprising a barrel, slide, recoil spring means and receiver assembly, said receiver assembly comprising a foremost end portion U-shaped in transverse sectIon, aligned bores adapted to receive a cross pin, spaced and rearwardly extending slide rails, and an integrally formed cross member intermediate said slide rails, said barrel terminating forwardly in a downwardly depending tubular section and rearwardly in a downwardly depending lug, horizontal flats laterally of said lug, said tubular section of said barrel adapted to at least partially insert into the foremost end of said receiver assembly, said recoil spring means at least partially extending into said tubular section of said barrel and abutting selected portions of said slide and said lug, means in said lug adapted to coact with said cross pin whereby said flats are pulled downwardly against said slide rails and said lug is pulled rearwardly against said cross member in said receiver assembly.