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Blasphemy to drill/tap the receiver on a M12 for scope bases?

991 Views 34 Replies 12 Participants Last post by  gcrank1
I really like my H&R M12. I bought it without any sights. It came with the EGW scope base that bolts to the rear scope block mounting holes on the barrel and hangs out over the receiver.
I can feel the whole scope/mount vibrate a little when fired, and can see movement if I push down on the rear of the scope. However that is not really the main issue.
My main issue is the scope base does not extend back far enough to get a good eye relief.
I have the scope rings back as much as I can, and the scope as far back in the rings as I can, and it is still not comfortable. I have to move my head forward to get a proper picture through the scope, to the point it is not natural.
It is not LOP issue, as that fits me perfectly. The original stock that came on it when I bought it had been cut down to a shorter LOP and it was too short and uncomfortable. And I still had the eye relief issue with it.
While some do not like the stock, I find it actually very comfortable.

With the current scope mount not extending over the rear receiver ring, I got thinking, how much would it be frowned upon to have the receiver drilled/tapped for a scope base (either one or two piece) on top of the receiver?

It is a shame they do not still make the Ken Viani mount, and no one has started reproducing it. Finding one is very hard and cost almost what I paid for the gun if you do find one.

Or, does anyone know of any other scope bases/mounts for the M12 that can put the scope over the receiver?
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434 Posts
Discussion Starter · #7 ·
I would do it as I wouldn't consider an M12 a collectible down the road.
I can usually find several for sale at the show so not rare. Great rifles, just heavy as heck.
More of a tool to be used for it's purpose.
Drill away.
Being somewhat new to owning one of these, I was not sure how these are viewed. I know they are very close to the same basic idea as a win 52D, and I know those seem to bring good money. But was not sure about the M12's.
This one was the only one I have ever seen locally, I got it at a gun show. It was the first one I have ever seen at one.
Anything 22 and heavy barrel always makes me stop and look.

You might become happy with a set of offset mounts to move the scope back further.
I thought about one of those cantilever scope mounts, but it would just add too much height.

Just a thought....are you sure that is the right EGW rail for that rifle?
It is the only style that EGW makes. It fits the win 52 and a couple others. It goes where the rear scope block would be.
The only differences in them are the 0 or 20 moa versions.

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434 Posts
Discussion Starter · #11 ·
The Viani mount is being made by S&K scope mounts. I received this message from them with a pic of the mount and it looks very nice.

<[email protected]> wrote

Good Morning,

I was just reaching out to let you know that we have the H&R M12 mounts done and ready to go! That was a great project! We may start making the Winchester 52 mount next as the H&R does not fit the 52! Ken Vanini has been great to us and we would love to keep his mounts going. As of now just the H&R is done. the price is $210.00 I attached a picture so you could take a look at it!

Thank you!
Oh wow really??
That is great news! How long ago was this email sent to you?
I have heard of S&K in the past but never bought anything from them. This may change soon!
I looked on their website but did not see it anywhere.
I will send them a email.

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434 Posts
Discussion Starter · #27 ·
I did not order the S&K mount.
After inspecting the pictures they sent me, it will not move the scope back any further than my current EGW mount. It pretty much puts the rear most slot you could put a scope ring, at the same spot.
I asked if they had plans to, or would add slots all the way to the rear and they said the design would not allow it.

So for now I am just dealing with what I have while I contemplate other options including making my own mount.

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434 Posts
Discussion Starter · #29 ·
Yea my rear scope ring is in the last slot, and the center part of the scope that has the turrets is about 1/8 in away from that rear scope ring. So I have it back as far as it can go.
It is ok on low power, but when I zoom in, you naturally have to move a little closer to the scope for a proper picture, and that is where I have the problem.

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434 Posts
Discussion Starter · #33 ·
I did it and never looked back. Two piece steel picatinny bases. Be sure to specify picatinny bases as Weaver rings will fit pic, pic will not fit Weaver. Burris XTR Signature rings will give you the option of +/- 0, 5, 10, 15, 20, 25, 30 or 40 MOA. I used +30 to get standard velocity 22LR out to 300 yards. This way I can dial elevation from 25 to 300+ yards well within the adjustment range of my scope. I couldn't be happier with the set-up.

View attachment 356472
Glad to see someone has done it.
I have not decided for 100% if I am going to drill/tap it yet or try and make my own mount.
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