thanks man, I've made some progress but, i'm stuck again .
When i extuded the barrel of the gun, i added some divisions (like 5) just incase i needed to add anything, but now i keep seeing little crevices between the divisions, and when i try to smooth it, it doesn't smooth the whole barrel, it smooths the inidividual divisions . Sorry if this is a really n00b question, i don't know how to fix it tho. I'm so slow at modelling, but you can see my progress anyway...