Lil wayne - yeah (explanation of some lyrics)

[jonathan_ym]

eyo,
maybe a stupid question but im not coming from a country where english is spoken so i was listening a song called yeahh

here's the link.
weezy says ''I got two tech-9's,
should i text or call you?''

i know a tech-9 is a gun bbut i dont understand the lyric, can someone please explaine????

thnqx