The assault rifles in Battlefield 3 are widely expected to include most of the weapons from previous Battlefield games, with few new additions. The main assault rifles in Battlefield 3 are:
M16A3 / M16A4
The M16A3 has been featured in all Battlefield games since Battlefield 2, where it was the default assault rifle for the Assault class on the USMC side. It has been confirmed that the rifle will return in Battlefield 3. It has been confirmed that both the A3 and A4 versions of the M16 will be available in Battlefield 3.
HK 416
The HK 416 is expected to replace the US M4 and M16 as the main assault rifle for the US forces. The rifle is already being used throughout the world as a replacement for the M16/M4. The HK 416 appeared in Bad Company 1 and 2, and is expected to be included in Battlefield 3 as well.
FN2000
The FN2000 was featured as an unlock in Battlefield 2, and is a Belgian-made assault rifle used in many nations in Europe. It’s expected to be one of the unlockable rifles in Battlefield 3.
Steyr Aug
The Steyr Aug is an Austrian-made assault rifle used around the world. I was featured in Bad Company 2 and Bad Company 2, it is rumored to be one of the main assault rifles in Battlefield 3, or at the least, an unlockable rifle.
AEK-971
The modern variety of the AK-47, the AEK-971 is the main rifle of the Russian army and was featured in both BF2, Bad Company 1 and 2. It is expected to be the main battle rifle of the opposing side in Battlefield 3 (Russian and/or Middle Eastern).
G3
The G3 is a popular assault rifle first made by Heckler & Koch in 1959, and is still in use today around the world, especially in third world countries. The G3 is used in many different variations, and is known for its stopping power and accuracy. The G3 was previously featured in many Battlefield games, and will return in Battlefield 3.
M27
The M27 is the newest infantry rifle, scheduled for service in the US Marine Corp. The M27 is based on the HK416 and features a gas-operated short-stroke piston action with a heavy barrel for improved long range accuracy. The M27 will make its first appearance in the Battlefield series in Battlefield 3.
G36C
The G36 and G36C were first featured in Battlefield 2, and now the G36C will return as an unlockable carbine rifle in Battlefield 3. The G36 was first introduced in the 1990s, and is today used around the world among special forces and counter terrorism units.
AK-74M
The AK-74 was a modernization of the famous AK-47, and in 1991, the AK-74 got modernized once again, this time carrying the name AK-74M. The modernized version featured a new synthetic stock, and a lot of minor changes and updates. The AK-74M has since become the standard rifle of the Russian forces, and it will be the primary weapon of the Russian forces in Battlefield 3.
AN-94
The Russian-designed AN-94 is a replacement for the famous Kalashnikov rifle. It has a revolutionary way of firing two bullets before the recoil kicks in, which gives it unique two-shot burst with great accuracy. The AN-94 was first featured in Bad Company 2, and will return in Battlefield 3.
Khaybar KH2002
The Khaybar KH2002 is an Iranian-designed assault rifle made in the early 2000s, and has now entered service in the Iranian military. Most of the features of the KH2002 are secret, and it’s the first time the weapon will appear in the Battlefield series.
AS VAL / VSS
The AS VAL is a Russian-made assault rifle with integrated suppressor, made for the Russian special forces. It was developed in the 1980s and is used to this day with the Russian Spetznaz and secret agencies. There are several versions of the rifle, including the VSS sniper rifle which was featured in Bad Company 2