Well, it doesn't matter whether you combat squad a 10 man squad or not. What matters here is the question whether you are using a Tactical Squad or an Assault Squad. Assault Squads can have Plasma Pistols, no matter how you combat squad them. For Tactical Squads, you need to get a Plasma Gun.
A veteran sgt in a Blood Angels tactical squad can take a plasma pistol. Even if this is just a 5 marine tac squad. No one else in the squad can take a plasma pistol.
A veteran sergeant in a Blood Angels assault squad can also take a plasma pistol.
Combat squad means a 10-man squad that has been broken down into 5-man squads. This applies to tactical squads, assault squads, veteran assault squads, death company squads, devestator squads and terminator squads...and possibly others...
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