Posted: 3/12/2005 6:13:05 PM EDT
With out spending a ton of cash, what optic would you strap on top of your M1A? I'm getting a Polytech M1A and want to get a decent optic for the occasional need to reach out and touch someone...errrr...something. |
|
Engineering Considerations for M14/M1A Scope Mounts by Walt Kuleck -------------------------------------------------------------------------------- Think about the mechanics of the M14/M1A scope mounting system for a moment. The inner, mounting surface of the typical mount mates up to the side of the receiver and is secured by the big screw. The second screw on "Generation 3" mounts fits into a clip guide block. If the two screws, when tightened, put *any* bending moment on the mount, the threaded fasteners are no longer in shear only but in tension also--not a good thing if you want them to stay tight as you bang on the mount (by shooting the rifle). The ARMS 18 Mount allows for this "misalignment" by providing lateral adjustment of the clip guide block mount during installation. Properly installed, the screws are in shear only, with no bending moment on the mount, as good practice demands if the screws are to remain tight. It cams into the alignment groove on the receiver, ensuring 100% lockup in the groove. Then it adds a stablizing screw at the front to provide solid lockup. If, when installed, your mount fits your receiver grooves well, and your clip guide mounting block is fortuitously positioned so that there is no bending moment on the mount, you are likely to enjoy satisfaction. Often these conditions do not obtain; thus the ARMS mount is designed to compensate for them. Note that the clip guide was never intended to be part of a scope mounting system, so the location of the roll pin hole with respect to the left receiver wall is not held to any particular tolerance. Heck, the grooves in the receiver aren't held to a tight tolerance, either! The weaknesses of the original single-screw design only became evident in service; that's why the two-screw design was developed. ARMS has simply gone the next step. Call it a "Fourth Generation" mount! Hope this helps. --Walt Kuleck |
|
From: Gale McMillan <[email protected]> Newsgroups: rec.guns Subject: Re: M1A scope Date: 23 Nov 1996 23:56:59 -0500 sawimmer wrote: Does anyone have a suggestion as to what scope I should mount on my new Springfield Armory M1A? The second generation scope that SA offers seems a bit high-priced. My bolt-action .308 Remington has a Nikon 3-9x40. Suggestions? There is nothing harder on a scope than an m14/M1A. The counter recoil is what wrecks them! In tests that I have run I found only a few that would stand up over a few rounds. Swarovski was the best in the intermediate price range. What about the Leupold LE models? Did they get trashed as well? Pete The LE Leupold Doesn't have much chance.The Ultra stands up longer. I had Redfield hunting scopes turn the erector lens cross ways in the tube after three shots If you put a transducer on the gun you will be surprised to see higher G forces when the slide goes forward than when it fires. Gale Mc |