The M1911A1 is seen used by several members of Bravo Company, including SFC Clayton "Zeke" Anderson (Terence Knox) and Lt. Myron Goldman (Stephen Caffrey).
Colt MK IV Series 80
Unlike other officer and soldiers, First Lieutenant John McKay's (Dan Gauthier) sidearm is a blued Colt MK IV Series 80 with pearl grips. This is anachronistic for the time period of the series, as the MK IV Series 80 was first produced in 1983.
MGC M1911A1
Throughout the series, the MGC M1911A1 is seen held by various actors.
Tokarev TT-33
NVA officers and some other characters can be seen armed with the Tokarev TT-33 pistols.
Rifles
M16 Variants
The M16 rifle was the main rifle of the U.S. Army soldiers in Vietnam and is seen carried by most of the platoon. In the series, various models of the M16 are seen.
Colt XM177 (Colt Sporter Carbine)
A Colt Sporter Carbine modified to resemble the XM177 rifle is mainly seen being used by SFC Clayton "Zeke" Anderson (Terence Knox). In Season 1, Anderson's Colt Carbine is seen loaded with a 30-round magazine (unusual for the time period of the series). For the remainder of the series, the Colt is loaded with the more accurate 20 round magazine.
M14
The M14 Rifle is seen used by Sgt. Block (Michael Madsen) in "Sleeping Dogs" (S2E06). The rifle is painted in a tiger stripe camo scheme.
M1-C Garand
In "Sleeping Dogs" (S2E06), a VC sniper is seen armed with the M1-C, a sniper variant of the M1 Garand.
Norinco Type 56
The Norinco Type 56 is seen in the hands of the NVA and VC soldiers.
The SKS rifle is seen a couple of times by VC and NVA forces.
Shotguns
Ithaca 37
The Ithaca 37 shotgun is seen in the hands of SFC Clayton "Zeke" Anderson (Terence Knox). Sgt. Block (Michael Madsen) also is seen with a full size shotgun.
Machine Guns
M60
The M60, the standard machine gun carried by American forces in Vietnam, is primarily carried by Pvt. Alberto Ruiz (Ramon Franco) in the series.
M60D
The "D" variant of the M60 is seen mounted on Huey helicopters as well as fired by enemy forces in the series.
Browning M2 HB
A Browning M2 .50 cal is seen mounted on US vehicles throughout the series.
Valmet M78
NVA forces are sometimes seen firing the Valmet M78.
Soviet SGM Goryunov
The Soviet Goryunov SGM Machine Gun or Chinese Type 57 machine gun is also seen used by NVA forces in the series. Actually it's not a real Goryunov machine gun. It's visually modified Browning M1919
Browning M1919
Hand Grenades
RGD5
M26 Hand Grenade
American soldiers widely use M26 hand grenades almost in each episode.