BERSERKER MGN7H-150 / 200 / 220 / 230 / 250 Linear Rails Viking Skis with Carriages

Berserker MGN[SIZE] Linear Rails — 440C Stainless Steel, Medium Pre-Load | West3D

Berserker linear rails are West3D's house brand MGN rails — 440C stainless steel, medium pre-load, produced on dedicated equipment for uniform consistency across every carriage. Butter smooth, rust-proof even in humid environments, and shipped dry with functioning grease ports ready for lubrication. The best value for smoothness, consistency, and price in the current market, tested against dozens of competing options before landing here.

440C Stainless Steel — No Rust, No Compromise

Most budget MGN rails are made from carbon steel with a surface treatment that corrodes in humid environments. Berserker rails use 440C stainless steel throughout — both rail body and bearings — which does not rust regardless of ambient humidity. If you're printing in a garage, basement, or enclosed chamber environment where moisture is a concern, 440C is the correct material choice.

Medium Pre-Load — Why It Matters

Pre-load is the interference fit between the carriage ball bearings and the rail raceway. Low and zero pre-load rails — the cheap, abundant options flooding the market — will free-fall under their own weight and introduce play that shows up as inconsistency in your prints. Medium pre-load eliminates that play and holds the carriage firmly in position under load, which requires tighter manufacturing tolerances and higher-quality steel to execute properly. Berserker rails are medium pre-load: firm, consistent, and smooth.

Dedicated Production Equipment

These rails are produced on equipment reserved exclusively for Berserker rail manufacture — not distributed across general production runs. The result is uniformity that's measurably better than rails produced on shared equipment where tolerances drift across batches.

Specifications

Lubrication

Berserker rails ship dry with fully functioning grease ports. Apply Mobilux EP2 via the included grease port before first use and after extended periods of operation. Mobilux EP2 is the community-standard lubricant for MGN rails in Voron and Klipper builds — it provides the correct viscosity for linear bearing applications without attracting debris or drying out quickly.

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