How many rounds does the m16a4 hold in a clip?

Answer 1

First off, let me start by informing you that "clip" and "magazine" are not interchangeable terms - clips are used to load the magazine, and magazines are what actually feed the weapon. Insofar as the clip goes, each one holds ten rounds.

As for magazines, the M16 magazine is universal throughout the entire M16/M4/AR-15 family (as well as a number of foreign weapons, such as the FN FNC, Tavor TAR-21, SAR80 and SR88, HK416, L85, etc.).

Militaries typically use 30 rounds as their standard magazine capacity for the M16 (or weapons using the same magazine interface). However, they can feed from magazines of any capacity designed for that rifle. Some units use 20 round magazines during unit weapons qualifications as a mean of preventing soldiers from cheating (whether by loading extra rounds into their magazines or by using the magazine as a support when firing from the prone unsupported position). There is also a 35 round magazine which has a National Stock Number applied to it - meaning that, at least in theory, units may be able to acquire the 35 round magazines, although I've personally seen none.

The military has tested the 100 round Beta-C drum magazines, but found their performance to be rather disappointing. There is a 90 round drum manufactured which fared better, although I can't say whether or not it's seen any use in the military.