All the traits Panamoan military personnel complain about the MK4 carbine

Delta HAWK operator suing custom MK4A1 carbine.jpg|A Delta HAWK operator using a MK4A1 carbine with an ACOG Scope and BUIS sight
Delta HAWK operator using MK4 carbine.jpg|Though the MK4/A1 is a combat proven carbine with good accuracy, it suffered from complaints about reliability and the gas system.
The MK4 may seem like a very practical carbine, but it hasn't live up to the expectations of the Armed Forces of the Panamoan Republic, which probably why it is more commonly used on law enforcement rather than military personnel.
== The weapon overheats quickly ==
The MK4 and MK4A1 have a 14.5" barrel which makes the carbine gas system being too short to handle the pressure of the lengthened 14.5" (368mm) barrel, unlike when opting for the shorter 10.5" and 11.5" barrel used by the MK4 CQBR and the MK4 Commando. Meaning, it overheats quickly because the handguard and the gas system, alongside the gas block are placed relatively close to the chamber. Despite high accuracy, it has overheating problems.
Which regrettably piles up the pressure and overheats after firing 200 rounds of live ammunition. The most common solution to that is firing it on semi auto, or utilise a mid (medium_ length gas system, to reduce pressure and overheating.
== Not that reliable ==
The obnoxiously exposed barrel is heavily vulnerable to harmful elements such as bending and overheating, and the only way to remedy it is by applying a thick barrel shroud, such as a thick cloth or sometimes improvising by using a duct tape.
== The Handguard is rough ==
Unlike the MK16A4, MK416 and other 5.56mm SDC rifles, the handguard is not decently perforated/textured and therefore it is usually uncomfortable to grip on with the user's bare hands, the only thing to solve it is to use rail covers, or grasp the mag well instead. However, it is not a problem when wearing combat gloves.
== "Unpredictable" Rate of Fire==
Inexperienced users state that the carbine sometimes fire at least 857 RPM unexpectedly on full auto; This is fixed with a under gased system to reduce fire rate and improve control.
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