I'm not the one to talk to about bringing on new members, but I just have a few questions which seem to be our biggest problem.
In the stuff you have shown us, how long on average did it take you to make those models? Days, weeks, or even months?
How long have you known about the mod, how often do you play, and can you see your self being active on the team in one years time if you are brought on.
You say guns are your specialty, but how do you feel about doing other models, such as small low poly props/garbage left around the level, high poly centerpieces that have lots of detail, or even outdoor objects such as trees, or other foliage?
Personally I think our biggest problem with trial members is they never come through. They show off their stuff, but then it takes them forever to produce anything. You have to be dedicated to the mod, but more importantly the team with feedback. Talk to team members on Steam or other instant messenger and visit the forum daily (Hourly for me personally).
Like I don't want to preach or anything, but we need someone who is willing to dedicate them selfs, instead of doing this for abit just so they can have a blip on their resume later in life.