Description
The SIG Sauer Alpha5 SOA55004 is a scope base from SIG Sauer with a M1913 Picatinny Rail interface.
SIG Sauer Alpha5 SOA55004 Overview
A scope base, or rail, is the foundation of any optic setup. It attaches to the receiver and gives the rings a solid, aligned platform, so the scope stays put through recoil and handling.
Bases are made for specific actions, so the exact receiver model and screw pattern matter. Some bases also add built-in elevation, measured in MOA, to stretch a scope’s adjustment range for long shots.
Fit and Compatibility
Mount type: M1913 Picatinny Rail. Ring or tube size: 35mm. Height: 1.25″. Confirm the exact firearm model, receiver or slide cut, and the optic you plan to run before ordering, because mounting parts are made to precise dimensions and a near miss does not fit.
Installation Tips
Degrease the screws and mating surfaces, then snug the fasteners in an even, alternating pattern. Use a torque wrench and follow the maker’s inch-pound values; overtightening can crush a scope tube or strip threads, while undertightening lets the optic walk under recoil. A drop of thread locker on base screws, but not ring cap screws unless the maker says so, keeps everything in place.
Build and Materials
It is made from aluminum and finished in anodized, with a listed weight of 6.30 oz. Machined aluminum and steel parts hold tolerances well, while polymer parts save weight and resist corrosion.
Holding Zero
The real test of any mount is return to zero: the optic should come off and go back on, or ride through hundreds of rounds, without the point of impact wandering. Rigid materials, precise machining and correct torque all contribute. Witness marks with a paint pen make it easy to spot movement at a glance.
Honest Limitations
No single mounting part fits every firearm and optic. Height, eye relief, footprint and rail spacing all vary, and a part that is perfect for one setup can be wrong for another. Budget mounts can work well on rimfires and light recoiling rifles, but heavy recoil and duty use reward premium machining.
Care and Storage
Wipe off dirt and moisture after a wet hunt with a microfiber cloth, keep a small set of the correct bits or wrenches in your range bag, and check fasteners at the start of each season. A light coat of oil on steel parts prevents rust, while anodized aluminum only needs to be kept clean. Protect the optic from dust and rain when the rifle is stored or cased.
Before You Buy
Match the part to your exact firearm and optic, check the height and size listed above, and contact us with the model of your rifle, pistol or scope if you are unsure. Mounting parts and optic accessories are not firearms and ship without an FFL transfer.
Common Setup Mistakes
The most common problems we see at the counter are simple ones: rings or mounts that are too tall or too short for the shooter, scopes mounted too far back so the eyepiece hits the brow under recoil, reticles that are not level with the rifle, and screws that were tightened by feel instead of to spec. Another frequent issue is mixing parts made for different rail standards, such as Weaver and Picatinny, which can let a mount shift. Take a few extra minutes during setup and the optic will reward you with consistent groups for years.
Specifications
- Brand: SIG Sauer
- Manufacturer number: SOA55004
- Type: scope base
- Mount type: M1913 Picatinny Rail
- Size: 35mm
- Height: 1.25″
- Material: Aluminum
- Finish: Anodized
- Weight: 6.30 oz
- UPC: 798681716784
Who It Is For
The SIG Sauer Alpha5 SOA55004 is a great fit for rifle owners who need a solid, properly fitted foundation for their scope.
Buy the SIG Sauer Alpha5 SOA55004 at MAG5 Firearms
MAG5 Firearms is a family-owned FFL in Collegeville, Pennsylvania. Order the SIG Sauer Alpha5 SOA55004 online, or browse our scope mounting and optics categories for more. For factory details, visit SIG Sauer.
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