all you need is another upper

by bj , Friday, April 27, 2012, 19:44 (4387 days ago) @ Alfred John

There are several advantages to the AR platform:
1) It is easy to shoot and accurate
2) It is easy to maintain
3) It is very versatile, meaning you can have one lower and multiple uppers for different uses

You can buy any brand of lightweight carbine upper and put it on your lower very easily. I think you can buy a reasonable upper starting at about $500. Colt lowers have been manufactured in "small pin" and "large pin" versions, most other manufacturers make "small pin" lowers. No way to tell which Colt you have without measuring the pins but even if you have the large pin version it is easy to get adapters to allow you to put a small pin upper onto it.