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-   -   Mounting/Setup of USGI NOS M3 sniper scope base (http://forums.thecmp.org/showthread.php?t=255850)

kmad2001 12-05-2019 08:48 AM

Mounting/Setup of USGI NOS M3 sniper scope base
 
I just I just picked up one of these from another member in the marketplace. Can anybody direct me to proper installation and setup learning materials?

6 Ring 12-05-2019 10:14 AM

Do you have a M3 modified stock?

kmad2001 12-05-2019 10:43 AM

No, but I'm sure I can buy a stock to booger up and modify as needed depending on what's involved

eightyduece 12-05-2019 12:06 PM

Is your plan to use a standard scope.

6 Ring 12-05-2019 01:40 PM

Or this one?
http://pic20.picturetrail.com/VOL171.../414166601.jpg

New2Brass 12-05-2019 05:05 PM

If stock does not have a long channel then no modification is needed.
If it does you need to remove material for the barrel mount.

The handguard will need to be modified.
Basically the bar and barrel mount need to be installed.
Line up the handguard and mark front and rear of barrel mount to the HG with a little extra.
Then material needs to be removed to clear the barrel mount. Or you can find a modified HG online.
I can send you the procedure if you like

kmad2001 12-06-2019 12:08 AM

6 Ring, I don't know what a standard scope versus "this one" means.


New2Brass, while I appreciate your input I'm afraid it's not terribly instructive to me for how to proceed. If there is a procedure, then, yes I'm sure we would like to see it.

6 Ring 12-06-2019 10:18 AM

The scope is a Weaver 330 and most commonly used on sniper carbines because they can be found. M73B1 or M8 scopes are found on carbines but are expensive. I have seen M82/M84 scopes on carbines also.

kmad2001 12-30-2019 01:17 AM

Can tap out the rear peep site but I'm not understanding how to attache the rear of the mount to the receiver.

eightyduece 12-30-2019 03:07 AM

Assemble the forward barrel mounting block to the barrel and check it;s alignment. Once you're satisfied that it is clearing the front of the stock when you insert the barreled action in the stock and the front of the slide is not striking it then tighten it down. With action removed from stock insert the upper hand guard and leave the nut and with washer on the barrel mounting block loose. Once this done start tapping the rear long part of the mount with dovetail into the dove tail of the rear sight. from right to left with bore facing away from you. Tap the dovetail over until it is centered inside the rear sight dovetail. As you're doing this insure that the front of the mount is started on the threaded section protruding thru the slotted front handguard. Once you are satisfied that the dovetail portion is equally spaced in the rear dovetail insert the little threaded shims and tighten them followed by the little jam nuts. You can tight the threaded shims by inserting a screw driver into the slot on either side of them. They don't have to be crazy tight. Install the washer and nut on the threaded bolt protruding out of the front hand guard and tighten it. Install the front ring in the dovetail on the mount and insure it's lined up with the axis of the barrel. Leave the ring screws loose and insert your scope thru i. Remove the rear eyepiece from your scope and insert the rear rings on the scope provided you are using the horizontal split rings. Skip this step if you are using standard split rings and just insert the rear split rings and align scope as far forward as you can for eye relief and align crosshairs. Tighten the rings and go sight it in.

kmad2001 12-31-2019 12:03 AM

Quote:

Originally Posted by eightyduece (Post 1898125)
Assemble the forward barrel mounting block to the barrel and check it;s alignment. Once you're satisfied that it is clearing the front of the stock when you insert the barreled action in the stock and the front of the slide is not striking it then tighten it down. With action removed from stock insert the upper hand guard and leave the nut and with washer on the barrel mounting block loose. Once this done start tapping the rear long part of the mount with dovetail into the dove tail of the rear sight. from right to left with bore facing away from you. Tap the dovetail over until it is centered inside the rear sight dovetail. As you're doing this insure that the front of the mount is started on the threaded section protruding thru the slotted front handguard. Once you are satisfied that the dovetail portion is equally spaced in the rear dovetail insert the little threaded shims and tighten them followed by the little jam nuts. You can tight the threaded shims by inserting a screw driver into the slot on either side of them. They don't have to be crazy tight. Install the washer and nut on the threaded bolt protruding out of the front hand guard and tighten it. Install the front ring in the dovetail on the mount and insure it's lined up with the axis of the barrel. Leave the ring screws loose and insert your scope thru i. Remove the rear eyepiece from your scope and insert the rear rings on the scope provided you are using the horizontal split rings. Skip this step if you are using standard split rings and just insert the rear split rings and align scope as far forward as you can for eye relief and align crosshairs. Tighten the rings and go sight it in.


it would seem it would seem on missing a mating dovetail piece on the mount

kmad2001 12-31-2019 03:12 PM

Thank you eightyduece


Okay I'm a morone. I didn't realize the dovetail was kind of hidden by lower tightening nut/bolt.


Will take a stab at this shortly.

kmad2001 01-01-2020 01:54 AM

Sooooo. Looks like the rear peep is not going to want to come out easily and I don't want to whack this thing too hard (unless I'm supposed to). Tried tapping it pretty hard with an ice cream stick for protection and it barely moves.


Some interweb searching finds several videos of guys using rear site removal tools of various kinds (any preferred?). Do I need to procure one of these or hit a little harder?

kmad2001 01-01-2020 03:00 PM

All I can find online is this w/o considering an actual USGI version.


Matrix Brand. Any feedback? Functional?



https://www.matrixprecisionparts.com...d-removal-tool

eightyduece 01-01-2020 03:18 PM

Have you tried the search function located at the top of the page. A lot of the information you seek has already been covered exhaustively and is archived for your viewing pleasure.

Most of the members here are purists and do not like words like smack, whack, bang, punch, tap, dig, scrape, bend etc....

I would recommend that you gather the information necessary and play it over in your head while looking at the parts to get a better understanding of what is needed before attempting this install willy nilly. It will be very frustrating for you if you have to stop and wait for replies to your questions before you can proceed further.

With that said, confirm the weapon is unloaded. Oil the rear sight with some penetrating oil and secure the receiver in a vise, adjust the rear sight all the way to the left side of the sight housing, using something soft like brass or a wood dowel as a punch tap the rear sight out of the dovetail from left to right with the muzzle facing away from you. While your receiver is still in the vise install the rail for the scope mount from right to left.


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