Z-Hat Custom Siamese Mauser M1903 20” .45-70 Govt. Bolt Action Rifle
SOLD FOR: $1,530.00
LSB#: LSB250509JR002
Make: Koishikawa Arsenal, Japan. Contracted for Siam (Thailand) / Z-Hat Custom Guns.
Model: Type 46/66
Serial Number: V242
Year of Manufacture: Circa, 1903
Caliber: .45-70 Govt.
Action Type: Bolt action, internal 5 round magazine.
Barrel Length: 20”
Sights / Optics: The front sight is a brass tipped blade set into a barrel mounted base. The rear sight is a XS ghost ring tapped to the rear receiver ring.
Stock Configuration & Condition: The stock is a single piece checkered walnut with a ebony capped forend, sling stud, capped semi-pistol grip, straight comb w/ cheek piece, sling stud, and rubber recoil pad. There are light handling marks throughout. There are no chips or cracks. The checkering is sharp. The LOP measures 13.5” from the front of the trigger to the back of the buttplate. Overall the stock rates in about Very Good to Excellent condition.
Type of Finish: Blued
Finish Originality: Original to Sporterization
Bore Condition: The bore is bright and the rifling is sharp. There is no erosion. In this writer’s opinion, the bore rates at a 9.5/10.
Overall Condition: This rifle retains about 99% of its metal finish. There are light handling marks throughout. The action has little to no wear. The screw heads range from light to moderate use. The markings are clear. Overall, this rifle rates in about Very Good to Excellent condition.
Mechanics: The action functions correctly. We did not fire this rifle. As with all used firearms, a thorough cleaning may be necessary to meet your maintenance requirements.
Box, Paperwork & Accessories: None.
Our Assessment: This Z-Hat Custom Siamese Mauser M1903 is a remarkable example of a classic military rifle transformed into a high-quality sporting firearm. Originally produced at the Koishikawa Arsenal in Japan under contract for Siam (modern-day Thailand), the Type 46 was a unique Mauser derivative chambered in 8x50R. This particular rifle has been expertly rebarreled and sporterized by Z-Hat Custom Guns into a potent and practical bolt-action chambered in .45-70 Government—a favorite among hunters and big bore enthusiasts for its versatility and stopping power. This custom rifle features a 20” barrel fitted with a brass-tipped front blade sight and a rugged XS ghost ring rear sight mounted to the receiver. The action has been skillfully mated to a beautifully checkered walnut stock with an ebony forend tip, cheekpiece, and rubber recoil pad, giving it a classic yet functional field aesthetic. Mechanically, the action is strong and smooth, while the bore remains bright and sharp with no signs of erosion—ready for the range or the field. The rifle retains 99% of its sporterized finish and is in overall excellent condition, showing only minimal handling wear.
For collectors, hunters, or shooters seeking a unique custom rifle built on a strong, historical action, this Z-Hat Custom Mauser is a superb option. The pairing of the rugged Siamese Mauser with the timeless .45-70 Gov’t cartridge results in a durable and powerful rifle that’s equally at home in a collection or out in the woods. Whether your interest is big game, brush hunting, or owning a distinctive piece of reimagined military craftsmanship, this rifle delivers both performance and heritage. -R.E.
