MK Machining’s biggest development yet: a fully assembled, rear-balanced modular platform built for professional end users. Patent-pending features include interchangeable magwells, an ultra-smooth control feel, straight-pull operation with swappable charging handles, controls positioned above the magazine area, and a barrel/trunnion assembly for fast cartridge changes.
As always make sure to keep an eye on our social media for more information our StraightBull Rifle. If you have any questions feel free to reach out to us at:
- Email: [email protected]
- Phone: 573-206-9335
Product Features
Ultra-compact overall length
Forward-positioned controls above the magazine area enable a shortened operating system for an exceptionally compact package.
True modular compatibility via interchangeable mag wells
Swap mag wells to match your setup: short/long action sizes and multiple magazine patterns (AICS, AR-style, etc.), supporting a broad .223 Rem – .338 Lapua target range (final compatibility list to be confirmed).
Fast cartridge changes with barrel/trunnion assemblies
Planned barrel + trunnion combo approach simplifies caliber swaps and helps maintain repeatable alignment across configurations.
Straight-pull action for smooth, fast cycling
A straight-pull operating feel designed for quick follow-up shots—paired with modular controls to fit different users and preferences.
Adjustable bolt travel (cartridge-matched bolt stops)
Install different bolt stops to limit bolt travel to “just enough” for the cartridge—supporting faster cycling and a dampening effect that helps reduce internal impact and wear.
Convertible left- or right-side ejection (simple bolt swap)
Set up for left or right ejection with a toolless bolt swap; the same bolt supports either ejection direction (a different bolt is required for caliber changes).
Free-float handguard + rigid top-rail mounting for zero retention
Free-floating handguard design, with the top rail intended to mount solidly to the trunnion and receiver to support consistent zero through handling and configuration changes.
User-fit ergonomics and modular interfaces
Interchangeable pistol grips, adjustable length of pull, and interchangeable bag rider options to tailor comfort, balance, and rear support.
Premium trigger system (patent pending)
A refined trigger design in development with patent-pending elements focused on consistent feel.
Dust cover (in development)
Dust cover design is still being finalized as development continues.
