1911 man, it seems

I did not know that (and was obviously too lazy at the time to STFW...)

Thank you, spittle!

It's me, Gloria, I left my driver's licence on the table, next to the fruit!

Actually, when the US military first adopted the AR15 as the M16, the barrel had a 1:14 twist rate and it was discovered that the 55 grain projectiles it fired were just barely being stabilized by such a slow rifling twist. This caused the bullets to tumble and yaw when they came into contact with just about anything, as well as hampering the potential accuracy of the weapon. They switched to a 1:12 twist to correct these problems, as it was found that this left the rounds stable enough for accurate flight. It was also noted that the destabilization (including yawing and fragmenting) upon impact led to increased tissue damage. However, this was not purposely designed into these early variants of the M16 and was discovered purely by accident. After seeing our success with a small-caliber high-velocity round, the Soviets wished to adopt one as well. (This was opposed by Mikhail Kalashnikov, designer of the AK-47, but that's another story). Anyway, they studied lots of data on 5.56mm military cartridges and decided to make a longer bullet that would purposely yaw and tumble inside a human body. They designed their 5.45mm projectile with a hollow cavity in the nose to shift its center of gravity to the rear to facilitate this. They also gave it a small steel insert to allow it to reliably penetrate NATO flack jackets. On the outside, it looked like any other military FMJ bullet. The US later got away from the lightweight 55gr bullets of the Vietnam era in favor of a heavier Belgian designed 62gr bullet called the SS109. It also uses a steel penetrator, but is not designed to destabilize upon impact. It is used in the modern M855 NATO cartridges for use in M16A2 and later variants featuring 1:7 twist barrels.

To get back on topic...
Kilmer's 1911A1 is a full size and seems to be sporting Pachmayr grips and a Novak-type rear sight. He also retrieves a Walther PPK from the container. His "go bag" contains an HK MP5K.
Macy's character also has a 1911.
The Australian guy is packing a Sig P226.

I'd also like to point out that there are several "crosshair inconsistencies" in this movie:
1. The sniper on the boat is using a Remington 700 rifle equipped with what appears to be a Leupold tactical scope, yet the reticle shown in first person is that of a Dragunov SVD. (It is possible he is using this by preference as a custom reticle, but unlikely).
2. The PVS-14 monocular they use on the beach has a mil-dot crosshair reticle in first person, which would also be incorrect.
3. The most obvious inconsistency has to be the MP5 used on the beach scene, which is clearly equipped with an Aimpoint optic, but displays the magnified reticle view of a Trijicon ACOG TA01.