Taurus T4SA 5.56 NATO
Model: 345561611
Taurus T4SA 5.56 NATO
Model: 345561611
Full Specifications
About This Firearm
The Taurus T4SA marks the Brazilian manufacturer's entry into the AR-15 market with a rifle assembled in the United States. It ships with a 16-inch chrome moly vanadium barrel in a faster 1:7" twist rate, a Carpenter 158 bolt, forged aluminum receivers, and Magpul furniture (CTR stock, MOE grip). At 100.8 oz, it is the lightest rifle in this group of mid-range ARs, coming in a full 7 oz lighter than the IWI Zion-15 and nearly 8 oz lighter than the Ruger MPR.
The T4SA's strongest selling point may be its low weight combined with genuinely solid component specs. The Carpenter 158 bolt, Melonite barrel finish, and Magpul CTR stock are parts normally found on rifles from more established AR builders. Reviewers have noted that the T4SA runs reliably once broken in, though some owners report that the mil-spec trigger and the lack of included sights make a trigger swap and optic purchase essentially mandatory from the start.
Best For
Strengths & Limitations
- At 100.8 oz, the T4SA is the lightest rifle in this mid-range group — nearly 10 oz lighter than the IWI Zion-15 and 8 oz lighter than the Ruger MPR — making it the easiest to carry and maneuver.
- The component spec punches above expectations: Carpenter 158 bolt, Magpul CTR stock, Melonite barrel finish, and forged aluminum receivers are parts normally found on rifles from more established AR manufacturers.
- Ships with no sights of any kind — not even a front sight post — so an optic or iron sight set is an immediate required purchase before the rifle can be used.
- The mil-spec single-stage trigger is the most basic trigger in this group, behind the nickel boron units on both SAINTs, the Ruger two-stage, and the Sig Matchlite Duo.
- Taurus has limited track record in the AR-15 market compared to Springfield, Ruger, Sig, and IWI, which may affect long-term parts support and resale value.
Category Rankings
How the Taurus T4SA 5.56 NATO ranks among full-size 5.56 NATO rifles.
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Frequently Asked Questions
Are there any common issues reported with the Taurus T4SA?
Early production T4SA rifles saw some reports of tight chambers causing failures to feed with certain steel-cased ammunition, and a few owners noted stiff magazine releases that loosened after a break-in period. These issues appear to have been addressed in later production runs. Running 200-300 rounds of brass-cased ammunition through a new T4SA is a common recommendation from owners to smooth out the action before relying on it.
Why does the Taurus T4SA use a 1:7" twist rate instead of 1:8"?
The 1:7" twist spins the bullet faster, which is better at stabilizing heavier projectiles like 77-grain match bullets and 62-grain M855 steel-core ammunition. Most other rifles in this group use 1:8", which is a more versatile middle ground. The 1:7" twist works fine with lighter 55-grain loads at normal temperatures, but some owners report slightly larger groups with light bullets in cold weather compared to a 1:8" barrel.