The SIG Sauer M400 Tread, unlike other base-model AR-15s, secures the barrel and handguard to the upper receiver with a completely different system that requires only two screws for assembly. For entry-level owners of this rifle, this makes changing out components like handguards and barrels even easier. Those who like to tinker with ARs won't have to have a collection of specialized tools to swap out components, making the already-accessible AR even easier to modify.
The company offers a number of accessories that are compatible with the new system, giving consumers the ability to swap out charging handles, fore-ends, hand stops, back-up sights, muzzle brakes and trigger units with common tools
For all the details on this easy-to-use platform, check out the video above and take a look at Shooting Illustrated's First Look here.