Multi Caliber Conversions

If you are in possession of a L.A.R. Manufacturing Multi-Caliber Conversion Unit (MCCU) for your Grizzly Win Mag™ pistol, CONGRATULATIONS! We are confident that this Conversion Unit will add to your shooting pleasure and versatility for thousands of rounds of ammunition if given but minimal care, cleaning and maintenance.

OPERATION AND USE

WARNING: THE GWM AND CONVERSION UNITS HAVE BEEN ENGINEERED, CALIBRATED AND MANUFACTURED TO BE USED ONLY WITH FACTORY-LOAD-ED, SAAMI-SPECIFICATION AMMUNITION. THE USE OF ANY OTHER AMMUNITION, OR THE ALTERATION OR MODIFICATION OF ANY PART OF THE MCCU VOIDS AND/OR INVALIDATES ALL WARRANTIES, EXPRESSED OR IMPLIED.

In order for a semi-automatic pistol to function reliably, all mechanical forces must be in balance. Since the weight of the recoiling parts is fixed, and since the length of a complete slide stroke is fixed, the recoil impulse available from a cartridge to operate the mechanism of your firearm must be sufficient to overcome these fixed resistances.

Our L.A.R. Multi-Caliber Conversion Units for the GWM pistol,

'* allow your pistol to be interchangeably converted (by the user) to other sub-calibers in just a matter of minutes, with no alteration or modification to the slide or frame of the pistol. This means that, unlike other sub-caliber conversions which permanently alter the frame and/or slide, allows you to always retain the capability of using your firearm in its original caliber. This is accomplished without the additional expense of another slide, since the GWM slide is used with all the MCCU sub-calibers. As noted, this technology is patented and L.A.R. Manufacturing, Inc.. is the exclusive supplier for this product.

As with most fine product improvements, the principles behind the operation of the L.A.R. MCCU are quite simple. For example, we use the Browning-type short recoil, locked breech system since it serves the purpose so well. However, we've incorporated a Multi-Caliber Extractor which is designed to spring in far enough to reliably capture and extract a cartridge rim of a "smaller" diameter, while being sufficiently flexible enough to spring out far enough to reliably capture and extract a cartridge rim of a "larger" diameter. We've also incorporated ejector designs that effectively shorten the slide stroke. These, in combination with carefully calibrated recoil springs of the proper force levels, combine to allow the fixed weight of the recoiling pans and the fixed length of the recoil stroke to accommodate cartridges with lower recoil impulses.

We have performed detailed analyses of the GWM pistol, and have dimensioned, toler-anced, calibrated and manufactured our "Drop-In" Multi-Caliber Conversion Unit components to be fully compatable.

INSTALLATION - ASSEMBLY - DISASSEMBLY

1. Place before you the L.A.R. Multi-Caliber Conversion Unit (MCCU) and your Grizzly Win Mag™ pistol.

2. Field strip your GWM pistol, as described on pages 13 and 14 of this manual.

3. Remove the .45 Magnum Barrel, with Barrel Bushing, Barrel Link, Barrel Link Pin, Recoil Spring, Magazine and Extractor (see Illustration 12). Place all of these parts in your MCCU parts box. (Holding out the Recoil Spring Plug, Recoil Spring Guide and the Slide.)

4. Remove the .45 Mag. Cal. Ejector (Illustration 13). (If the ejector or ejector pin in

EJECTOR

Lar Grizzly Pistol Magazines

EXTRACTOR

lllust. No. 12- REMOVING EXTRACTOR

EXTRACTOR

EJECTOR

EJECTOR PIN

11 lust. No. 13- EJECTOR & EJECTOR PIN

EJECTOR PIN

lllust. No. 12- REMOVING EXTRACTOR

11 lust. No. 13- EJECTOR & EJECTOR PIN

your pistol is difficult to remove, have your favorite gunsmith remove it, or send you gun to L.A.R. Manufacturing, Inc. for Conversion Unit installation. Once removed, it will, from then on, assemble and disassemble readily without tools.)

5. Install the supplied MCCU Ejector on the receiver (lllus. 13). (You need not re-install the ejector pin.) (Fitting may be necessary in only very rare cases.)

6. Install the MCCU Extractor in the slide and capture same with the firing pin stop. The tool used for installation and removal of the extractor is the hammer strut.

7. Install the Barrel Bushing on the MCCU Barrel, and re-assemble the pistol as described in the "Note:" on page 14. Test cycle, by hand, 3-5 times to insure that all the components assembled to this point fit freely and function normally.

NOTE: After the initial assembly of the L.A.R. MCCU to your GWM pistol, all of the above is simplified to the point that the conversion process becomes a simple process of field stripping with selective parts replacement.

8. Insert the appropriate MCCU magazine into the receiver.

9. Lightly lubricate the firearm (especially the newly installed MCCU components) with a light weight gun oil.

10. Remove and load the magazine, then continue the loading/firing process as with any caliber.

Note: After a little practice, the above conversion process can be accomplished in a couple of minutes.

PROBLEMS AND REMEDIES:

When all forces are in balance, your GWM and compatible Conversion Units will perform properly. Should your weapon not function properly, check for one (or a combination) of the following factors:

1- FAULTY AMMUNITION: i.e. - insufficient pressure, projectile seated too far out or too far in, case mouth dimension oversize, etc. Your Conversion Unit has been manufactured and live-fire tested to provide reliable functioning with SAAMI-standard, factory-loaded ammunition only. Use of ammunition other than the above may not provide reliable functioning and may be unsafe. This MCCU is NOT finicky about the type or kind of ammunition used. However, it must conform to SAAMI specifications. Some reloaded/remanufactured ammunition mics larger at the mouth of the case than at the reference dimension .200" forward of the rim. Obviously, this ammunition will not feed to the full depth of the chamber. REMEDY: Use best-grade, factory ammunition.

2- TOO STRONG A RECOIL SPRING. REMEDY: Use the one supplied.

3- TOO STRONG A MAINSPRING. REMEDY: Use the one supplied.

4- MAGAZINE SPRING TOO STRONG. (Not very probable, but possible.) REMEDY: Use the one supplied.

5- DIRTY GUN, DIRTY CHAMBER. (Dirt slows the cycle time, using some of the available energy to overcome that dirt, thereby reducing the amount of energy left to cycle the action.)

REMEDY: Keep your gun and all components clean. See the section on Cleaning on pages 14 to 16.

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  • birikti
    How to remove a grizzly extractor?
    9 years ago

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