不管别的原因，没有入籍先不要玩枪，
一不小心触犯了自己不知道的哪条法律条文，
尽管刑事处罚可能很轻，也会被驱除出境，

http://www.uscis.gov/propub/DocView/slbid/1/2/65?hilite=

INA (a)(2)(C)很清楚的这样写着。

(C) Certain firearm offenses.-Any alien who at any time after admission is convicted under any law of purchasing, selling, offering for sale, exchanging, using, owning, possessing, or carrying, or of attempting or conspiring to purchase, sell, offer for sale, exchange, use, own, possess, or carry, any weapon, part, or accessory which is a firearm or destructive device (as defined in section 921(a) of title 18, United States Code) in violation of any law is deportable.

这里没有规定minimum刑期 for deportation，同时移民法把
conviction定义扩展了。刑事法庭的无罪推论不适用于移民法