June 23rd, 2019

Tough Burris Tactical Rings with Inserts — Best Option for PRS?

Burris Pos-Align XTR tactical Rings preload elevation

For years we have touted the advantages of Burris Signature rings, with polymer Pos-Align Inserts. PRS/NRL shooters take not — this technology is available in a beefier, heavy-duty ring system for tactical rifles. The impressive Burris XTR Signature Rings offer six (6) clamping bolts per ring plus strong, dual steel base-clamps that self-center on Weaver or Picatinny rails. These aluminum XTR Signature Rings provide strength and holding power, plus the key benefits of Pos-Align inserts. As impressive as XTR rings are — they aren’t that expensive, with 1″-diameter XTRs starting at about $90.00 per pair (30mm and 34mm XTRs cost a bit more).

The polymer inserts in Signature rings perform three key functions. First, the inserts provide full, uniform scope-to-ring contact, with no need for lapping. You get a very secure “grip” on your scope without ring marks. Second, the Pos-Align inserts can provide elevation “pre-load”. With eccentric (offset) inserts, you can raise the back of the scope relative to the front, gaining up to 54 MOA of built-in elevation, without the need for expensive tapered bases. Third, the offset inserts can be rotated clockwise or counter-clockwise to shift point of impact. This lets you zero your rifle easily while keeping the turrets in the center of their travel.

Burris XTR Signature Rings are offered in 1″, 30mm, and 34mm diameters, and three (3) different heights: 1″, 1.25″, and 1.5″. Each ring set includes two sets of concentric inserts and one set each of the following offset inserts: +/-5 MOA, +/-10 MOA, +/-20 MOA. These allow you to “pre-load” elevation and/or center up your cross-hairs.

– Pre-load Elevation. No need for expensive tapered bases for long-range shooting.
– Correct misalignment caused by off-center receiver holes.
– Correct for bases or rings being slightly off-center.

How to Pre-load Elevation
To add elevation, set the Pos-Align Offset Inserts to raise the rear of the scope and lower the front. As long as there remains sufficient clearance between the front objective bell and the barrel, Burris recommends lowering the front of the scope the most and raising the rear of the scope the least. The amount of actual elevation “pre-load” will depend on the ring spacing (see chart). In the illustration, with 4.75 inches between ring centers, a +/- 20 MOA pair in the front combined with a -/+ 5 MOA pair in the rear will yield +25 MOA of total elevation. (If the rings are positioned further apart, you’ll get less elevation pre-load.)

Burris Pos-Align XTR tactical Rings preload elevation

Using Inserts to Adjust Point of Impact in Any Direction
Although it is convenient and most understandable to refer to the ring inserts as a “bottom” or “top” insert, the inserts may be rotated to any angle within the scope rings. This allows the shooter to correct the point-of-impact in any direction. The drawings below show how the inserts can be rotated to induce both elevation and windage changes at the same time.

Burris Pos-Align XTR tactical Rings preload elevation

Product tip from Boyd Allen. We welcome reader submissions.

Permalink Gear Review, Optics, Tactical 3 Comments »
June 23rd, 2018

Great Price on 6-24x50mm MRAD FFP Vortex Viper PST Scope

Vortex Viper PST MRAD 6-24x50 scope sale bargain First Focal Plane

Here’s a killer deal on a Front Focal Plane (FFP) optic good for PRS competition and tactical applications. The Vortex Viper PST 6-24x50mm scope features 0.1 Milrad clicks with an EBR-2C illuminated reticle with Mil-based hash marks. This reticle also features the “Christmas Tree” type lower half, which provides range hold-overs with horizontal markings for wind holds.

Vortex Viper PST MRAD 6-24x50 scope sale bargain First Focal Plane

Not that long ago, this scope sold for around a thousand bucks. Now you can get the Vortex Viper PST 6-24x50mm for just $619.99. That’s a steal for a PRS-ready FFP comp scope with a proven track record and rock-solid Vortex warranty. This is available for Pre-Order now, with inventory arriving very soon. EuroOptic’s Sale price is $649.99 and you get an additional $30 off with Code POVIPER. Here are reviews from actual buyers in 2017:

“I have both Vortex Viper PST Gen 2 6-24x50mm and a Vortex Razor HD 4.5-27×56. While the Razor HD is a fantastic scope its little brother the Viper PST Gen 2 closes the gap considerably. If the Razor is worth $2500. I would put the PST at $1800 in true value, they are just that close. I will most likely buy another PST before I buy another Razor HD.”

“Scope is very well made and has good optics. The zero stop works well and the clicks have a good feel no slop or mush, a click is a click. Bought this for my Ruger RPR and have found it to be ideal for this rifle in both performance and price. I installed and zeroed the scope on a different rifle and then reinstalled on my Ruger with the recorded settings and was right back in a 1″ square at 100 yards. Very repeatable.”

Manual for Vortex Viper PST 6-24x50mm FFP MRAD | Manual for FFP EBR-2C MRAD Reticle

Permalink Hot Deals, Optics 1 Comment »
January 6th, 2013

New Nightforce 5-25x56mm FFP Scope with 120 MOA Elevation

Nightforce 5-25x56mm BEAST Scope

Nightforce Optics has created quite a stir in the tactical shooting community with the announcement of its new 5-25x56mm First Focal Plane scope, which it calls the “B.E.A.S.T.”. The news is in the numbers — this new scope offers a whopping 120 MOA of elevation travel, and you get a full 60 MOA travel with each rotation of the turret. That’s right — 60 MOA with one turn. With many modern cartridges you can get to 1200 yards (and maybe farther*) with a single revolution — that eliminates all sorts of user-error issues when dialing back-and-forth between yardages.

Nightforce 5-25x56mm BEAST Scope

This is a first-focal-plane design, so the reticle stays constant relative to the target, allowing ranging at any magnification. The scope is offered with four (4) click-value choices: 1/4 MOA, 1/2 MOA, 0.1 Mil, and 0.2 Mil. Whether you chose MOA clicks or Mil-based clicks, you can get an appropriate reticle because Nightforce offers both the MOAR ranging reticle and the Mil-R ranging reticle. The three other reticle options are: MD2.0, TReMoR, and H59.

Nightforce 5-25x56mm BEAST Scope

Nightforce 5-25x56mm BEAST Scope

The new B.E.A.S.T. 5-25x56mm Nightforce has a mounting length of 5.92″ and weighs just 39 ounces. If you need illumination for low-light work, you’ll like the new B.E.A.S.T. scope. It offers external-control digital illumination with Unique i4F™ four-function brightness control. Other features are listed below.

Nightforce 5-25x56mm BEAST Scope

DOWNLOAD Nightforce PDF Spec Sheet for 5-25x56mm B.E.A.S.T. Scope.

Nice Scope with a Beastly Price
Nightforce says that “B.E.A.S.T.” stands for “Best Example of Advance Scope Technology” — some marketing guy’s bright idea we suppose. Perhaps “B.E.A.S.T.” better signifies “BEAST of a price”. This scope, with either MIL-R or MOAR reticles, costs an astounding $3,298.00! You can build a pretty darn good custom rifle, all premium components, for less than that!

*We used JBM Ballistics to plot the trajectory of a .308-caliber 168gr Berger Match Target BT launched with a 2800 fps muzzle velocity (sea level with 59° temp). Starting with a 100-yard zero, JBM calculates 52.5 MOA drop at 1200 yards and 62.6 MOA drop at 1300 yards.
Permalink New Product, Optics 6 Comments »