Picatinny rail consists of slots with 5.23 mm spaces between one another, which means that it can be used across its entire length. It is simple to mount and interchangeable – if something is made for a Picatinny rail, it will fit regardless of the manufacturer or manufacturing date. It is affordable, resilient and reliable – this is why it so commonly used by professionals and military. Because of all its great qualities, Picatinny rail has been dominating the rail market in the recent years.
Picatinny is a big step forward from the Weaver standard. Weaver has a few predesignated slots while Picatinny has slots all over its surface, allowing the device to be mounted wherever the user finds it fitting. Weaver's slot is 3.8 mm wide, which is why ring mounts made for a Weaver rail will also fit on a Picatinny rail while ring mounts made specifically for a Picatinny rail will not fit on a Weaver rail. This is one of the main reasons why Picatinny is a far better mounting solution.
Recknagel is currently the biggest manufacturer of mounts in Germany. Their Picatinny rails, known for great fit and finish, are mostly made of high-grade aluminum (a few are also made of steel), which is why they are very reliable. Screws are included. Currently, a common trend among rifle manufacturers is making receivers out of aluminum – mounting a Picatinny rail made of aluminum on one of those receivers is thus not problematic. Their products are marketed either under the name Recknagel or Era-Tac.
In 1855, Horace Smith, Daniel B. Wesson and C.C. Palmer founded Volcanic Repeating Arms Company. Oliver F. Winchester, a clothing manufacturer, was one of the shareholders. He soon became the biggest shareholder, and with time the company changed the name to Winchester Repeating Arms Company. The first firearm that they made was Model 1866 – it reached high popularity. Some of its best-sellers are Model 1894 (more than three million pieces were made) and, of course, Model 70 – the Rifleman's Rifle. Winchester has also been a very successful ammunition manufacturer throughout its existence. These are their most famous cartridges: .30 WCF .44-40 WCF, .50 BMG, .270 Win., .308 Win., .243 Win., .22 WMR and .300 Win. Mag. Today, Winchester is owned by Olin Corporation.
First introduced in 1936, the Model 70, also known as the Rifleman's rifle because of its reputation among shooters, has an iconic place in the American culture. It is a bolt-action rifle. Models released before 1964 are nowadays referred to as “Classic“. These rifles had a claw-like extractor of the Mauser type (controlled-feed). Then, Winchester changed the extractor to push-feed but eventually decided to re-introduce the former one. Up to 1984, the same length of the receiver was used for every caliber, which was a disadvantage – the receiver and bolt were too long for some small calibers such as .223 Rem. The first Mod. 70 that had receiver adapted to small calibers was XTR Featherweight. Because Winchester Model 70 has been so popular throughout the years, many versions have been made. Winchester chambers their long-action models for .270 Win., .280 Rem., .30-06 Sprg., .300 Win. Mag., .338 Win. Mag., .375 H&H, .416 Rem., .458 Win. Mag. and 7mm Rem. Mag. For mounting purposes, there are two holes in the front part of the receiver and two holes in the rear part of the receiver.
Rifles Winchester Model 70 short, Model 70 long, Model 70 WSM and Model 70 WSSM have similar actions. The radiuses of the mounting surfaces are the same but there is a difference in B distance (see the picture below). This is why, for example, two-piece mounts made for Winchester Model 70 short will fit rifles Winchester Model 70 long, Model 70 WSM and Model 70 WSSM while one-piece mounts made for Winchester Model 70 short will not fit rifles Winchester Model 70 long, Model 70 WSM and Model 70 WSSM.
This mount is suitable for Winchester 70 LA (long-action).
A: 22 mm
B: 96.5 mm
C: 22 mm
BHU: 3.4 mm
Remove all the stains (grease, oil etc.) from the rifle's receiver with a cleaning fluid (acetone). Once the surface is clean and dry, check whether the screws match the rail and the holes on the receiver. Make sure that the Picatinny rail is compatible with the rifle by inspecting the mounting holes on both. Before mounting the rail permanently, apply a minimal amount of thread-locking fluid 278 or 648 on screws and contact surfaces. Be careful not to get the fluid in or near the mounting holes. Carefully clean the remaining excess fluid around the rail with a cleaning fluid. Using a torque driver, screw the screws appropriately (up to 2.2 Nm) – do not overtighten.
The product has a warranty period of 10 years.
|Mount series||ERA-TAC Picatinny Rails|
|Suitable for||Winchester 70 Long|
A, B and C markings refer to the distances between holes on the rail/mount. A is the distance between the front two holes on the rail/mount.
A, B and C markings refer to the distances between holes on the rail/mount. B is the distance between the holes in the middle (usually, that is the distance between the 2nd and 3rd hole on the rail/mount).
A, B and C markings refer to the distances between holes on the rail/mount. C is the distance between the rear two holes on the rail/mount.
BH stands for Bauhöhe (ger.) which means overall height. It is measured from the mounting surface of the rifle to the lower surface of the riflescope's tube.
Often, the elevation adjustment that the riflescope offers is not adequate to compensate for the bullet drop when shooting at long range. When the riflescope runs of out of elevation, a mount with an inclination is needed. 20 MOA is the most common inclination. With it, the user gains 58.2 cm / 100 m of additional elevation range when shooting at the range of 100 m. This is approx. 5.8 Mrad of elevation.
(Posted on 25/08/2016)