The Rob Roberts A400 RR Custom Xtreme Plus is a full-size semi-automatic shotgun chambered in 12 Gauge with a 3 1/2" chamber and a 26" vent rib steel barrel. It has a 2+1 capacity, an Optima HP aluminum receiver, and a synthetic stock. The SB Timber finish is aimed at waterfowl applications. 
 

Key Specifications 

• Brand: Beretta 
• Model: A400 RR Custom Xtreme Plus 
• Caliber: 12 Gauge 
• Action: Semi Auto 
• Capacity: 2+1 
• Barrel Length: 26" 
• Color/Finish: SB Timber 
   

Detailed Features 

• 3 1/2" chamber for full magnum loads 
• Vent rib steel barrel with Optima HP choke system 
• Optima HP aluminum receiver 
• Synthetic stock in SB Timber waterfowl finish 
• Right-hand configuration

Owners of the A400 RR Custom Xtreme Plus tend to speak highly of the Rob Roberts customization layered onto the A400 platform. The gas-operated action draws consistent approval for cycling a wide range of loads, and the SB Timber camo finish gets positive marks from waterfowl hunters for its coverage pattern.

The Optima HP choke system is a regular talking point. Shooters who pattern-test their loads appreciate the tight tolerances, though some find the aftermarket choke selection narrower than expected. Opinions on the 26" vent rib barrel split depending on personal preference for swing weight in a duck blind versus an open field.

Value splits opinion. The Rob Roberts customization commands a premium over a standard A400, and some buyers feel the upgrades are more cosmetic than mechanical. Others say the out-of-box fit and finish justify the price for a dedicated waterfowl or competition setup.