Quoted:
Trigger housing is plastic, and there might be a few other cost saving features.
As is every 870 Express. Also, polymer trigger guards have proven more durable - at least for Ruger. Their 10/22 polymer trigger guard withstands impact (as in, no cracking/breaking), much better than the aluminum trigger guard (cracks completely with the same amount of impact)
This is what I found from a Remington press release, except this is talking about the 20ga Shurshot. It sounds like it's a slug gun.
Offerings for 2009 are as follows:
Remington® Model 870™ Express® ShurShotTM
Model 870 Express ShurShot FR-CL
Gauge 20 (2 ¾ or 3-inch)
Mag. Capacity 4
BBL Length 18 1/2 inches
Barrel Type Fully Rifled Cantilever
Sights Cantilever Scope Mount
Metal Finish Matte Black
Overall Length 38 3/4 inches
Length of Pull 13 3/4 inches
Drop (Comb) 1 1/2 inches
Drop (Heel) 2 inches
Stock Material Synthetic
Stock Finish Black Synthetic
Avg. Weight 6 3/8 lbs