I am relatively new to the M4, but now I am even more confused.
Mine is a California bought model. It holds 3 in the tube and one in the chamber. I see that Dadams sells extensions to hold 7, using the factory spring.
However, the above posts refer to the extension adding 2 rounds, and can use the factory spring. So, the means you guys are having your models hold 5 rounds from the factory?
What all do I have to do to make a CA model 7 rounds?