[LouAvul]

Yes, it's a Remchoke system. I have another 870 (Wingmaster) and the chokes are interchangeable.

I don't understand, "Five Seven for a semiauto." What do you mean?

[uncommonsense]

The FN Five Seven is based on a 5.7 x 28mm round. It's super light, low recoil, very accurate, penetration good but not too much for use in a neighborhood, and holds 20 rounds.

Review with specs and comments: FN Five Seven review Shooting Times

Some good comments here: FN Five Seven review policelink