Hello, this is my first post here. Just wanted to get some ideas on my dilemma. I am from the Philippines and I recently ordered a Metro Arms MAC 1911 in 45 cal. Here is the product page:http://metroarms.net/MAC1911. This gun is meant to compete with the STI Spartan (I think). The problem is the dealer ordered the .40 caliber instead of .45 cal. What are the disadvantages/advantages for a 40 caliber in a single stack 1911? I have waited for a month and half already and re-ordering would take another 1 1/2 month because of stupid gun control laws and the factory basically only makes them when there is an order for it. I am tempted to go with the .40 just to spare myself another long wait. This would be my first ever firearm. I am a disappointed that I have to wait a loooong time.