SCOPE BLOCKS

Scope blocks are available in many configurations and heights.  The list below shows the more common, in-stock items.

Blocks are unhardened, black-oxide finished, and for both round and octagonal barrels, unless otherwise specified. 

Hole spacing is .560" front and .860" rear, unless noted.

Prices are for individual blocks, except for Springfield blocks which are priced as a set.

Screws are an additional $1.50 each, and shipping is $4.50 for the first set, $1.00 more for each additional set.

 

 

Please note that this product line is all directed towards the 60 dovetail, external-adjustment type of scopes.

I do not carry any products for the "modern" Weaver or Picatinny sort of mounts.

 

Additional scope block information...

I certainly do not claim to know everything in this field, but with experience, many trends have become visible.  With that said, the following information is provided, but is open for correction or rebuttal!

Traditional scope blocks often seem to be described as either "3/8 inch wide" or "1/2 inch wide."  In fact they are neither, although 1/2" is close.  Original Unertl dovetails generally measure .494" to a theoretical sharp corner.  This matches the older Winchester A5 scope mount dimensions.  MVA has told me that they cut their mounts to .484" to a sharp corner, which is slightly smaller.  It's a theoretical number because due to cutter tip wear or even the wire EDM radius, a perfectly sharp inside corner is almost never achieved.  This is why a scope block with a perfectly sharp corner is not desired - it would hang up on that small non-sharp inside corner of the mount.  Additionally, due to these conditions, measuring either an existing scope block or a mount by going across the "corners" may not give a useful dimension.

The solution for these issues is two things.  First, the scope block width must be slightly narrower than the mount that it's intended to fit.  And second, the sharp corner of the block should be knocked off.  The standard blocks I make are targeted to .482" across the sharp corner.  But the actual top width will be .465", which gives an intentional small flat, allowing for non-sharp-cornered mounts or even dirt in the corners.  It also makes the edge must less susceptible to damage.

Hole spacings for scope blocks are mostly standardized (although slightly odd) dimensions.  Since about 1920 or so, they seem to have been set at .560" front and .860" rear, with holes tapped 6-48.  Sometimes the .560" is .562" - I have old charts which show both.  Realistically that .002" difference is not significant.  There are numerous exceptions to these rules, however.  Older original Stevens rifles (pre-model 414 rifles) were often drilled at .700" front and .825" rear, with 5-40 holes.  I have encountered a handful of rifles where the rear holes are spaced .875" (7/8") rather than .860".  (In fact, a tape-measure examination of .860"-spaced holes will frequently lead to the conclusion that they are spaced at 7/8", which is only rarely true.)  Sometimes rifles have been drilled for Weaver-type mounts, and then the holes may be spaced either .500" or .504".  Remington 40X and 700-series rifles have a spacing on the rear ring of .600".  And a recently-discovered Remington 513T oddity is that the factory holes are not 6-48; they are 6-44's.  Many seem to have been re-tapped to 6-48, however.

Custom scope block delivery times have points worthy of discussion.  I try to keep a good selection of non-drilled, already-black-finished blocks on hand.  This allows for quickly placing holes in non-standard locations.  But even then, the turnaround will depend on whether the manual mill is in use, set up for another job, and how long that job may take.  I generally do not charge extra for special holes or a special height, in a black-finished block.  The other extreme could be this - a customer wants a really odd block; maybe a bizarre dovetail angle, specific base radius and height, weird holes, offset from the centerline, color-cased as well, as finally he wants it absolutely as soon as possible.  To process this one hypothetical little scope block through the shop on its own (interrupting current work and setups) and get it out and back from finishing, could easily cost the customer $300-400!

For this reason, I usually try to accumulate a bunch of special block orders, and process them through with the next batch of standard blocks.  Thus the widely-varying delivery times - so if you happen to be first on the list, but I've just completed a batch of blocks, the wait could still be 2-4 months until the next pile rolls around.  On the other hand, if you catch me when I'm making blocks, and it's easy to slide it in, then it might be only a week or so.  So if you really want to "buy" the shop to get one block made, that's fine, but you need to expect an unpleasant bill!

Occasionally I will be asked why one scope block screw costs $1.50.  This is related to the quantities being made.  I make a lot of them, but not millions.  And both the heat treating and the black finishing cost about $75 per batch, whatever that batch size may be.  So if I make, heat treat and black finish only 100 screws, and then sell them at $1.50 each, I've actually made zero dollars per hour, and lost money on the raw material besides!  The answer is to make much larger batches - more like 2000-3000 at a time.  This also relates to making just one or two special screws - yes, it can be done, but unless I can lump them in with others, the price will of necessity be ugly.

Thanks for reading!

 

 

 

Standard

 

Standard blocks are available in heights of 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 5/8", 3/4", and 1".  The base has a slight concavity which allows them to mount on either a round or an octagonal barrel.  Heights are measured from a flat surface.  They will sit .005" to .02" lower on a round barrel.  They have the Lyman/Unertl crescent on one side and the Winchester dimple on the other. 

 

Price: $12.00 each; 5/8" and taller $15.00 each

Flat-bottom

 

Flat-bottom blocks are specifically for mounting on an octagonal barrel.  They may "rock" on old draw-filed barrels; in that case, use the standard blocks (above).  Heights available are: 3/16", 1/4", 5/16", and 3/8". 

 

Price: $12.00 each

Posa

 

Posa blocks are for use with Unertl Posa-mount rings.  They are available either Posa/Lyman combination or Posa only. They can also be used with the Redfield 3200 scopes.  Heights available are: 3/16", 1/4", 5/16", 3/8", 1/2", 5/8" and 3/4".  Available color-cased also.

 

Price: $12.00 each black, $16.00 each color-cased.

5/8" and 3/4" high are $15.00 each - black only.

 

Color-cased

 

Color-cased blocks are available in several configurations, including standard, Posa/Lyman and flat-bottom.  Heights available are: 3/16", 1/4", 5/16", and 3/8".  Flat-bottom are 3/16" height only.

 

Price: $16.00 each

 

Stainless Steel

 

Stainless steel blocks are available either in standard or Posa/Lyman configurations.  Heights available are: 3/16", 1/4", and 5/16". 

 

Price: $20.00 each; stainless screws are $2.00 each

Fecker

 

Blocks for Fecker mounts are slightly narrower than standard.  (Lyman and Unertl scopes will fit Fecker blocks, but Fecker scopes may not fit standard blocks).  Heights available are: 3/16", 1/4", and 5/16". 

 

Price: $12.00 each 

1903 Springfield

 

These blocks duplicate the blocks provided on 1903 Springfield rifles.  Also available in Posa configuration.  Either color-cased or black finish. 

 

NEW for 2013 - heights that are .100 or .200 taller than the standard.  This allows for low-height scopes such as the Lyman to clear the bolt handle.

 

Note - a lot of questions have arisen about using "Springfield" blocks or Unertl O & E blocks.  Functionally they are identical.  My understanding (and I am not an '03 expert) is that the "Springfield" blocks are the style that would have been provided by the armory, and that the O & E is what Unertl would have provided with their scopes if intended for an '03 rifle.  The Springfield-style blocks with the slightly rounded ends take more time to produce, and that accounts for the price difference.

 

Price: $36.00 per set

Unertl O & E

 

NOTE - approx. June 2104 - this product is going to be discontinued.  These blocks are basically the "not pretty" version of the '03 blocks above.  Most people have been buying the specific '03 blocks rather than the O & E, thus the decision to not continue making these, since they have not been a popular item.  Sales will be limited to stock on hand.

 

These blocks duplicate the Unertl O (rear, .230" high) and E (front, .470" high) blocks.  Available either black or color-cased. 

 

Price, black: $12.00 each; color-cased: $16.00 each

Stevens

 

These blocks are specifically for Stevens scopes.  They have the original-style V-shaped locking groove, and are available with either Stevens holes (for 5-40 screws, .700" and .825" spacing) or with standard holes.   They are also available flat-bottomed.  Heights are 3/16" and 1/4".

 

Price: $12.00 each 

-70 series

 

These are the front blocks used on the Winchester Model 70 target rifles, with the 1.750" hole spacing.  Heights are as follows... A-70 - .170";  B-70 - .230";  C-70 - .315";  LC-70 - .370".

Also available in Posa configuration.

 

Price: $16.00 each

Mann-Neidner blocks

 

These are the tapered blocks for Mann-Neidner mounts, intended to tighten on recoil.  They are specifically for use on '03 Springfield rifles.  The bottom of the front block is cut to the barrel taper, so that the block sits level. 

 

Price: $50.00 per set

Cross-dovetail blocks

 

Meant to go into a standard 3/8" x 60 barrel dovetail.  The lower ones are usually used for front sights, and the taller ones for a front scope mount, when it mounts into a rear sight cut in the barrel.  The lower ones are either 3/16" or 1/4" high.  The higher ones are duplicates of the Unertl BK, K and KK blocks.  Any of them can be provided with the brass set screw.  I have some that are intentionally .005" larger, to be filed to fit.

 

Price: $24.00 each

Vaver blocks etc.

 

These blocks are for Vaver front sights.  They are available either for the sights with the little pointy clamp screw, or for the ones that use the side clamp ring.  Heights are .100" or 3/16".  The .100" high blocks require special low-head screws.  The clamp rings are also available.

 

Blocks - $12.00 each

Screws - $1.50 each

Clamp ring - $5.00

Blanks

 

We have many blank, undrilled blocks on hand, already black finished.  Drill them yourself, or let us know what hole spacing you need and we will do it for you.  Heights available are 3/16", 1/4", 5/16", and 3/8".

 

Price: $12.00 each

Screws

 

Screws are available for all block heights.  Standard thread is 6-48.  Stevens screws are 5-40.  But don't worry if your rifle has yet different tapped holes - I currently have screws in sizes of 6-32, 6-40, 6-44, 8-36, 8-40, 10-32 and 10-36.  We should be able to find it there!

 

Price: $1.50 each; Stainless $2.00 each

6-48 Taps

 

New for 2014 - set of taps (plug and bottoming) for standard 6-48 scope block mount holes.  These taps are 4-flute HSS, made in USA specifically for Steve Earle Products.  Sold as the set of 2 only.

 

Price: $45.00 per set

 

(Note MSC's price for these taps is $45 each.)

 
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