| It is highly popular because of its additional Ultimate Gold skin on M4A1-Custom which is a reliable rifle with overall balance and stability.|
- Weapon description
This weapon still retains the M4A1-Custom's feature, such as the silencer and red dot sight. The M4A1-Custom-Ultimate Gold sports a full ultimate gold plated skin and an expanded magazine capacity plus enhanced accuracy and firepower.
- Moderate-high damage dealing.
- High accuracy.
- Medium rate of fire.
- High magazine capacity.
- Usable red dot sight.
- Higher accuracy when using red dot sight.
- Loses accuracy when sprayed for too long.
- Slow rate of fire when using red dot sight.
- CF China
- CF Vietnam
- CF Philippines
- CF Indonesia
- CF West
- CF Brazil
- CF Español
- In CF China, this weapon incorrectly use the M4A1's firing sound instead of M4A1-S
- In CF Japan, this weapon was available in Black Market but later it is available in Big Bear's boss crate.
- In CF Vietnam, the permanent M4A1-Custom Ultimate Gold does have the damage bar, but no fix button. VTC support team officially claims that it's designed this way, so everyone will have to bear with it.
- There is another related glitch, if players win more than one permanent M4A1-C UG, upon quitting the game and re-login, they will merge together and the damage bar will stack, resulting in an incredibly LONG red bar. This is because M4A1-C UG from Big Bear crates was programmed to stack together and "reset" the damage bar, but since this gun becomes permanent prize, the damage bar was not reset but instead lengthened. For this reason, players can get more M4A1-C UG and have the damage bar extended to avoid weapon wearing down.
- Eventually, 1231 patch quietly addressed this problem and gives this gun a functional Repair button. However, those that got this gun multiple times and ended up with a long red bar can't repair it, as it'll display "Repair item failed" error upon clicking the button.
- Being an AI-excusive weapon, but an early-July cash spending event allowed players to get this weapon without farming Boss Arena by spending 319 Vcoin to get this weapon (along with M66-Gold Vintage & Field Shovel-Blue Diamond).
- CF Indonesia is the only version that doesn't release this weapon along with Big Bear boss patch. Instead, it's released on Defense Mode patch and can be obtained from the Defense Mode keycard for 7 days.
- In CF Philippines, this weapon is obtainable in Big Bear's boss crate and Defense Mode (with keycard) for 7 days.
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