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1 pc. vs. 2 pc. bases

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/28/2004 at 11:00
Manuel View Drop Down
Optics Apprentice
Optics Apprentice

Joined: July/08/2004
Status: Offline
Points: 132
this probaby belongs in the mounts/rings forum but  hardly anyone goes in there... i was wondering if some of u guys would offer your opionions on 1piece vs 2 piece bases  also the advantages and disadvantages of a 1inch tube vs a 30mm tube

Edited by Manuel
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/30/2004 at 09:57
Chris Farris View Drop Down

Joined: October/01/2003
Location: Texas
Status: Offline
Points: 7790

I prefer a two piece because it uses all four screw holes and allows more access to the action for hand feeding and cleaning.  A lot of people claim the one piece is stronger and it makes the action stronger.


30mm scopes were first made in Europe years and years ago for two reasons.

1. Everything was done by hand and a large tube was needed to be able to build the scope.
2. They are on the metric system.

When we started building scopes in the U.S. technology had advanced some and being on the Standard system we built our scopes with 1" tubes.

The German scopes were and are superior because they use better glass, better coatings and better craftsmanship. Most people assume that bigger is better and that must be the reason why German 30mm scopes are brighter. It did not take long for U.S. and Asian scope makers to catch on to this and start offering 30mm scopes. It worked for a while but more and more people are learning the truth with the advent of the Internet. When Leupold first offered a 30mm tube in a hunting scope, they named it the Euro. 30. A competitor dissected one and said, B.S. that scope has 1" guts with a 30mm tube. Leupold's spin doctors quickly changed the name of the new 30mm line of scopes to LR or Long Range and released press releases stating that this new line of scopes has 1" internals with a 30mm tube to allow for more elevation adjustments.

Bottom line is 30mm scopes are 30mm because of the Metric system, they can be brighter than a 1" scope with all other things being equal (# of internal lenses and diameter of objective especially) if the maker takes advantage of the larger internal lenses in a manner that manages the light better (cutting down on distortion and stray light loss).  30mm scopes are also stronger and usually heavier.  Biggest advantage is more internal adjustment travel for long range shooting.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/09/2004 at 09:19
Red_SC View Drop Down
Optics GrassHopper
Optics GrassHopper

Joined: August/26/2004
Location: United States
Status: Offline
Points: 9

Personally, I like one piece bases.  Many people think that a one piece base is better because it helps get the rings aligned better.   This is with weaver or picatinny rings.  Some also bed the base, to take any tension out of them and make sure it stays straight.  The screw holes on many modern rifles are drilled ever so slightly out of square and some receivers are slightly warped from the heat treatment, causing rings on two piece bases to not be perfectly aligned, which will actually flex the scope tube and can cause internal damage if it's bad enough. 


Lapping the rings or using dovetail rings can also fix that problem.  Also, two piece bases offer better access to the ejection port for loading.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/09/2004 at 23:21
Roy Finn View Drop Down
Steiner Junkie

Joined: April/05/2004
Location: United States
Status: Offline
Points: 4856
I stopped believing in the one piece base theory a long time ago, as many of the accuracy riflesmith's have seemed to subscribe to advantages of the 2 pc. base and ring set-up's. All the big dollar boys mount a 30mm Swarovski of their high tech proprietary actions or re-machined 700 action's. The vast majority use Talley bases and rings or 2 pc. base/ring designs of their own making. If you think that a one piece base is going to make your action more rigid, I had some swamp land for sale in Florida.
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