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One-Piece scope mounts (I like 'em)

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Litehiker View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Litehiker Quote  Post ReplyReply Direct Link To This Post Topic: One-Piece scope mounts (I like 'em)
    Posted: September/07/2019 at 22:59
Ilya, Your Dreadfulness,

In my opinion a well made one-piece scope mount (Nightforce, LaRue, etc.) should not need lapping for a good fit with no torque on the scope tube. If well made the machining should be very exact and being of one piece (in the base) I hoping the top rings would match extremely well.

Am I nuts?

Eric B.
There are no comfortable packs - some are merely less uncomfortable than others.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote koshkin Quote  Post ReplyReply Direct Link To This Post Posted: September/08/2019 at 12:04
On mounts: single piece mounts do not need to be lapped. If yours needs to be lapped, return it and get a different one.

On your sanity: do not ask questions where the answer might make you uncomfortable...

ILya
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Litehiker View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Litehiker Quote  Post ReplyReply Direct Link To This Post Posted: September/08/2019 at 15:44
Ilya, 
Thanks for confirming my suspicions on quality one-piece scope mounts.

On my sanity... you sound much like my wife. Loco

Eric B.
There are no comfortable packs - some are merely less uncomfortable than others.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kickboxer Quote  Post ReplyReply Direct Link To This Post Posted: September/08/2019 at 16:08
ILya has a lot of "wifely" qualities...
Opinion,untempered by fact,is ignorance.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote supertool73 Quote  Post ReplyReply Direct Link To This Post Posted: September/08/2019 at 16:31
i have 10 or so double ring mounts from american defense, bobro, seekins, vortex, larue.   I have personally tested every one with kokopelli products alignment bars. All of them have been perfect. I have two $40 ones i bought off amazon that look exactly like a $85 vortex one i own and they were also perfect in ring alignment. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RifleDude Quote  Post ReplyReply Direct Link To This Post Posted: September/08/2019 at 18:03
Ring alignment is influenced as much by the trueness (or lack thereof) of the receiver surfaces and screw hole alignment that the mounts are attached to as the precision of the mounts themselves, maybe more so. The mounts are usually blamed when rings aren't aligned, but often as not, they aren't the culprit; it's the receiver they are bolted to. It's hard to build a square and level house on an un-level foundation.

Keep in mind that receiver surfaces are frequently polished and ground on by hand to remove tool marks as finish prep prior to applying bluing or other finish, affecting geometric "trueness." Add to that the fact that some are cast surfaces, and slight stress-relieving/warpage can occur when material is removed during machining steps prior to then. Then, there's the fact that screw holes by themselves cannot locate bases with precision due to the clearance between the screws and the screw holes in the bases. All of these potential sources of geometric error combine into "tolerance stackups."

A 1-piece base mount eliminates axial and radial misalignment because the whole unit is machined in 1 piece in the same machine setup, so geometric relationships are maintained. However, if the receiver surface it's mounted to isn't true, you can still have some degree of misalignment when the screws are torqued down and the base bends to comply with the surface. Lapping is certainly an option to correct for any misalignment, but I think bedding the base(s) against the receiver plane(s) they mount on is a better option, if noticeable misalignment exists.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Litehiker Quote  Post ReplyReply Direct Link To This Post Posted: September/12/2019 at 23:11
I agree with Rifle Dude that the "truest" way to mount one-piece scope bases is to epoxy bed them. Remember to not torque the screws down to, say, 24 inch  pounds until the epoxy has cured. Just tighten enough to feel some resistance, wipe off the epoxy that squeezes out and wait 24 hours or the curing time indicated on the epoxy instructions.

My Browning X-Bolt Pro and many other rifles now come with Cerakote which can act as a "release" coating to keep the epoxy bedding from sticking to the action.

Otherwise it's best to coat surfaces with a release agent before applying the epoxy.

Eric B.
There are no comfortable packs - some are merely less uncomfortable than others.
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