Where at? SR4 Anniversary Edition P 317 and p 318 in the table descriptions. It says a Fichetti Security 600 has RC of (1), same with a Yamaha Sakura Fabuki.
And in the text description, the Security 600 comes with a detachable folding stock, and the Sakura Fabuki also has a folding stock. Since you may choose to have the stocks extended or not (to affect concealability, to choose to use the weapon one-handed without the stock, etc), the recoil compensation is in parenthesis.
The Hammerli 620S has a RC of 1. All are light pistols.
And the Hammerli is described as having integral gas-vent systems. Not optional, so no parenthesis.
The 2(3) RC is listed under submachine guns on the next page; The Ingram Smartgun X and HK MP-5 TX. The HK-227X, AK-97 Carbine, and Uzi IV all have (1) RC as well.
All have folding or detachable stocks. Again.
When recoil is provided by a shoulder stock, it'll be a parenthetical value. When it's from integral, always-on, sources (built-in gas venting, or the special chamber design of an Ares Alpha, for instance), it's not.