We didn't set out to make just any M4. Instead, we used the innovation, performance and attention to detail that defines other SIG rifles to evolve the platform. The result is the SIGM400, a superior system offering advanced features available right out of the box that were once only found on the after-market.
- Direct Impingement Gas Operating System with Rotating Locking Bolt
- 5.56 x 45 mm NATO Nitride treated Barrel
- Accepts Most M16 Type Magazines
- Fixed Front Sight
- Non-Telescoping Stock (MIL-SPEC)